Plow Plane

identity

• name: Plow Plane — also spelled Plough Plane (the standard British spelling; both used interchangeably in sources and throughout this entry), sometimes "grooving plane." In its expanded multi-cutter form, called a combination plane (Stanley 45/46/55) [R1][R5]. Not to be confused with the Rabbet Plane, its direct mechanical sibling, nor with the Router Plane, which trues an existing recess floor rather than cutting a fresh channel (see lineage).
• family / category: Planing tools → the joinery-grooving branch. Defined by function and registration, not by fittings: a plane that uses a narrow cutter and an edge-referenced fence to cut a groove parallel to that edge. Many — but not all — later plows add a depth stop and interchangeable cutters. That distinction matters, because the earlier "bevel-down, fence, depth stop, interchangeable irons" definition excluded historically central examples: Moxon's 1678–83 plow had no depth stop, and joiners of his era kept a separate plow per width rather than swapping irons; dedicated fixed-cutter grooving and match planes have no interchangeable irons either. Bevel orientation, arm arrangement, cutter interchangeability and stop design are variant fields, not defining ones — bevel-down describes common Western forms without having been surveyed across the family [R1]. Sits directly beside the Rabbet Plane in the same fence-and-depth-stop mechanism family this corpus has now documented from both sides.
• one-line: A hand plane with a fence, a depth stop, and a set of narrow interchangeable irons, used to cut a groove — a fully enclosed channel, not an open-sided step — down the middle of a board's face or edge, most commonly for panel/drawer-bottom grooves, frame-and-panel joinery, and one half of a tongue-and-groove joint [R1][R14].
• not to be confused with: the Rabbet Plane (cuts an open-sided step AT an edge or corner, not an enclosed channel in the middle of the field — Moxon's own 1678-83 text describes the plow as "a narrow Rabbet-plane with some Additions to it" — a contemporary author's analogy establishing shared form and the functional split, not a documented line of descent) [R1][R2]; the Router Plane (references a cutter's depth off the flat face of the work to true a recess FLOOR that's already been roughed out — it has no fence and does not efficiently cut a fresh groove from solid stock the way a plow plane does) [R15, cross-ref Router Plane]; the Combination Plane (Stanley 45/46/55 — a plow plane's mechanism expanded with many additional cutter profiles — beading, fluting, tonguing — a related-but-much-bigger, genuinely harder-to-master multi-tool, not simply a fancier plow plane — now built as its own entry, Run 360) [R5][R23]; a Dado Plane (a fixed-width, unfenced plane built specifically for cross-grain work; an ordinary plow with a straight cutter and no spurs is poorly suited to that job, though skew-cuttered and spurred combination configurations are built for it — see matching; now built as its own entry, Run 361) [R16][R17].

✦ how NOT to use it

• not-for (jobs it should never do):
  • not a substitute for a Rabbet Plane's edge/corner-step cutting work — see matching [cross-ref].
  • not a substitute for a router plane's recess-floor truing [cross-ref].
  • not the right tool for a groove set deep into a wide board's middle field, past the fence's reach [R16, HIGH].
• dangerous (misuse that injures the user). No plow-plane-specific injury-frequency evidence was located in this run's research — no forum first-person account, no named-professional account. That is a research result, not an empty hazard class. The tool has an exposed narrow iron, can bind or leave the work, directs force toward an exit edge, can tip when the fence loses registration, and requires handling and sharpening a small sharp cutter. The controls below follow CCOHS's sharp-tool guidance — inspect, hold work mechanically, keep body parts out of the slip path, and do not force the cut [R26].
  • using the plane without inspecting it first — check the body, cutter retention, the fence, the arms/rods or staves, the depth stop and every screw before a session. A loose fence or an unseated cutter is the fault behind both the diving and the wandering documented below.
  • holding the stock by hand, or letting long work go unsupported — secure it mechanically, and support the overhang. Thin and narrow stock is not automatically the safe case: it is safe only when it can be held firmly while still leaving clearance for the fence and the depth stop, which is the harder setup, not the easier one.
  • putting the holding hand, or your body, in the cutter's projected slip and exit path — plan where the plane goes if it jumps the line or breaks out at the far end.
  • starting with a deep cut — set the iron shallow for the first passes. Depth is what turns a wander into a dive.
  • pushing through binding, chatter, or a fence that has shifted — stop and re-set. Excessive force on a plane whose registration has failed is how control is lost.
  • leaving the iron exposed during adjustment, transport or storage — a plow iron is narrow, and narrow edges are easy to grab by accident.
  • treating sharpening or a powered substitute as part of this tool's risk profile — sharpening raises its own dust and edge-handling controls, and a router or router table has an entirely different hazard set with its own manufacturer instructions. Neither family is generically safer than the other; each is safe only in a defined setup.
• damaging (misuse that ruins the tool or the work):
  • tear-out from unsevered surface fibers — the iron can pass under the surface without cutting the side-wall fibers cleanly, causing tearing rather than a clean cut; the documented fix is pre-scoring the groove's walls with a marking gauge and knife before the first plane pass, especially in figured or tear-out-prone woods [R14, HIGH — full text read, direct mechanism explanation].
  • the iron "diving" or wandering in hard or figured grain — a real, first-person documented case (Stanley 13-052 and a restored Stanley 45 in old, hard red oak): the iron either dives uncontrollably or, backed off enough to stop diving, won't cut at all. Root cause per Paul Sellers, relayed directly: the fence is not parallel to the sole/skate when the locking nuts are tightened — a specific, checkable, easy-to-miss mechanical fault, not a tool defect [R14, HIGH — direct relay of a named practitioner's diagnosis].
  • cross-grain use without mitigation — combination-plane-family irons "don't cut that great across or against the grain" without a specific workaround (back-beveling the iron, pre-scoring across the grain, or starting the cut with a dedicated dado plane); working cross-grain without one of these is a real, documented failure mode, not a hypothetical one [R13, HIGH — named forum poster, direct quote].
• beginner-trap (mistakes that look fine until they aren't):
  • setting the iron too deep, hoping to finish faster — a repeated beginner error across multiple technique sources, leading to chattering, clogging, and a struggle to push the plane; the corrective is a light, thin shaving [technique-source synthesis, MEDIUM — not one single fetched primary source, treat as a generalized consensus].
  • the "obvious" single continuous pass, end to end — Moxon's own literal 17th-century instruction, and the technique most likely to let the iron wander off-line, especially across figured grain; the corrective (short advancing strokes, lengthened progressively) is a real technique refinement layered on top of the tool's oldest documented instructions, not an obvious first instinct [R1, HIGH — Christopher Schwarz's direct analysis of Moxon's text].
• lineage-misuse (treating it like a related-but-different tool):
  • confusing it with the Rabbet Plane — the best-sourced misuse category in this entry, anchored in a primary 17th-century text: Moxon's own words define the plow as a rabbet plane with specific mechanical additions, meaning the two tools' shared ancestry is real and their functional split (edge-corner step vs. middle-of-field channel) is easy to blur without understanding the mechanism, not just the shape [R1][R2, both HIGH]. The sibling Rabbet Plane entry documents this confusion from its own side [cross-ref, R24].
  • confusing it with the router plane — already ruled on in the sibling Router Plane entry's own kit-fit block: the router plane trues a recess FLOOR to a referenced depth; it does not efficiently cut a fresh groove from solid stock the way a plow plane does, lacking a fence entirely [R25, cross-ref, Router Plane, HIGH].
  • expecting a combination plane's other cutter functions (beading, fluting, small rabbets) to perform as well as a dedicated single-purpose tool for each job — the sourced access debate above (Weaver, Dorn, Drew, and the independent "Combination plane vs Plow plane" thread) converges on exactly this: the No. 45 "works fairly well as a plow plane. Not that great for anything else" [R13, HIGH — direct quote].

correct use

Brief — the workbench holds deep operation. In one sentence: the plow plane cuts a groove down the middle of a board, fully referenced off the edge by its fence; it is not the tool for a corner cut (the rabbet plane's job) or for truing an already-cut recess floor (the router plane's job).

• what it's genuinely good at: fast, accurate, repeatable long-grain grooving in thin-to-moderate stock, referenced off an edge — drawer bottoms, panel grooves, one half of a tongue-and-groove joint; cleaning up or widening an existing machine-cut groove by hand [R14][R15].
• how to use it well (brief): lay out the groove's distance from the edge and its depth before the first pass, ideally pre-scored with a marking gauge and knife in tear-out-prone woods, since the iron can pass under unsevered surface fibers and tear them [R14, HIGH]; give each hand exactly one job — one thrusts the plane forward, the other presses the fence against the work, per Christopher Schwarz's direct technique note on Moxon's own instructions [R1, HIGH]; start with short strokes near the far end and progressively lengthen them working backward, rather than committing to a single full-length pass from the start — the corrective technique to Moxon's own literal (riskier) single-pass instruction [R1, HIGH]; on a dedicated single-purpose plow, expect the fence and depth stop to remove two of three registration variables a beginner would otherwise hold by eye; on a combination-plane form, budget real time for setup and tuning [R13][R23].

✦ matching

The workbench's first read.

• does: "cuts a groove (a fully enclosed channel) of a set width and depth down the middle of a board's face or edge" — width set by the interchangeable iron, depth by the depth stop, position by the fence referenced off the edge [R14, HIGH]; "cuts one half of a tongue-and-groove joint" when paired with a matching tonguing iron/plane; on combination-plane forms, "cuts small rabbets, beads, flutes, and other joinery profiles" via interchangeable cutters beyond straight grooving [R5][R6].
• suits: drawer-bottom and box-lid grooves (the single most repeated application across sourced material); frame-and-panel door construction (grooves in stiles/rails receiving a floating panel); case-back panels sliding into grooves; window sash and frame joinery; tongue-and-groove flooring/paneling with a matching iron [R14, HIGH][R15, MEDIUM]. A named Sawmill Creek poster offers a sizing impression — the plow plane is "really for making grooves on thin panel stock, like drawer bottoms" [R13, MEDIUM]. Carried as one practitioner's remark, not as a matching rule: the 3/4″ stock gate it was promoted into is withdrawn. Stock thickness is not groove width, and no named design manual was found establishing such a threshold; ordinary frame-and-panel and cabinet work in 3/4″ stock is squarely within the tool's range.
• kit-fit:
  • pairs with: a marking gauge, for laying out the groove's edge-distance and depth before the first pass [R14, HIGH]. The Rabbet Plane, in constructions combining both cuts on the same joint (e.g. a rabbeted-and-grooved drawer front) — a named Sawmill Creek poster documents this exact working pair (a Stanley 78 for rabbets alongside a Record 050 for grooves) [R15, HIGH]. The Router Plane, genuinely complementary: the plow plane cuts the groove from raw stock; the router plane trues its floor to a consistent depth, especially useful where the groove runs into a stopped end the plow plane's own body can't fully reach [R25, cross-ref, Router Plane, HIGH]. A match-plane partner iron/plane, for a true tongue-and-groove joint cut from both sides of the same reference face [cross-ref, Rabbet Plane, R24].
  • substitutes for: a router with a straight bit and an edge guide, or a router table, for a straight groove parallel to an edge — the single most consistently sourced substitution claim in this run's research, including the manufacturer's own framing: Lee Valley markets the Veritas Small Plow Plane as "an excellent (and quieter) alternative for work often performed with a router" [R17, HIGH — manufacturer's own copy]. Multiple named Sawmill Creek posters (Chris Griggs, James Owen, Zach Dillinger) independently confirm making and keeping this switch for their own work [R15, HIGH — full thread read].
  • does not replace (preferred-tool ranking, not a mechanical boundary): the Router Plane is preferred for truing a recess floor to uniform depth — especially a broad or stopped floor, or one beyond fence reach — and a fence-registered plow struggles with grooves set deep into a wide board's middle field. A plow can still deepen or clean a straight, edge-referenced groove that matches its cutter and body geometry; the router plane is the better tool, not the only possible one. Shannon Rogers (The Renaissance Woodworker, a named practitioner already cited in this corpus's Shoulder Plane and Rabbet Plane entries) states this directly: "Plow planes are wonderful tools but they tend to fall apart when the groove is placed deep into the middle of a board where the fence won't reach. Likewise I find grooves wider than about 3/8″ (~10mm) are difficult as the wider blade doesn't have a lot of support and chatter becomes a big issue" [R16, HIGH — full text read, directly quoted]. The Rabbet Plane's job of cutting a step at an edge/corner rather than a channel in the field — this entry's own Moxon-sourced distinction, restated from the plow plane's side [cross-ref, R1][R24]. A Dado Plane's job of cutting cleanly across the grain — for an ordinary straight-cuttered plow without spurs; skew/spurred and combination configurations are a separate case, documented in not-for above [R16][R17][R9].
• not-for (project-keyed):
  • rabbets and fillisters: model-dependent, not prohibited. A dedicated wooden plow normally specializes in enclosed grooves. Some modern and combination plows cut small rabbets when the cutter, skate/body support, fence and depth stop are configured for it — Lee Valley's current Veritas small plow is expressly designed to cut grooves, rabbets, tongues and beads, with its depth shoe controlling groove or rabbet depth, and Traut's US294,825 documents one stock configured as plow, fillister and rabbet. Consult the model's manual. For a dedicated edge-step where the plow has no support, the Rabbet Plane is the right tool [R17][R9].
  • truing or deepening an existing groove: the router plane is preferred, not the only possibility. The router plane excels at final depth control and at stopped or wide recess floors, especially beyond fence reach. A plow can deepen or clean a straight, edge-referenced groove when the cutter fits it, the fence or the groove itself gives reliable registration, and the stop and body can operate [cross-ref].
  • don't reach for it on a groove set deep into a wide board's middle field, away from any edge — Shannon Rogers names this directly as a failure mode, not a hypothetical [R16, HIGH].
  • wide grooves: read the model's cutter range, not a universal number. Chatter risk rises with unsupported cutter width, depth and aggressiveness of cut, and with the material and grain — so maximum useful width is a function of cutter support and the specific plane, not a family threshold. Current Veritas small-plow standard blades stop at 3/8″, but that is one product's range, not a physical limit [R17]. Shannon Rogers's own ~3/8″ figure below is his experience with his planes and is carried as practitioner evidence, not as a rule [R16].
  • cross-grain work: depends on the configuration, not the family. An ordinary dedicated plow with a straight cutter and no scoring spurs is a poor choice across the grain — use a Dado Plane, or the saw/chisel/router-plane method. But skew-cuttered and spurred combination configurations are built for it: this entry's own text lists Stanley No. 46 skew cutters for cross-grain work, Lee Valley's current combination plane uses scoring spurs with a batten to cut through dados, and US294,825 describes deployable spurs and a specific dado configuration. The gate is whether the particular plane has the scoring, the support, the guide and the maker's instructions for it [R16][R17][R9].
• access: a genuine, well-sourced split, not a single verdict. A dedicated single-purpose plow plane (Veritas small plow, Record 043/044, most wooden forms) is comparatively approachable — two hands, two distinct jobs, per a named Sawmill Creek poster's (Zach Dillinger) direct technique explanation: "Assuming you are a righty, your right hand does nothing more than push the plane forward. Your left hand's job is to keep the fence tight up against the reference edge... If you do this properly, your groove will be straight and the edges will be square, assuming your fence is square to the plane sole" [R15, HIGH — directly quoted]. A combination plane (Stanley 45/46/55) is a genuinely different, higher-skill proposition, converging across two independent forum threads and multiple secondary sources on a real, repeated pattern: a steep learning curve real enough that many surviving vintage examples are in excellent condition specifically because they were abandoned unused after owners found them too fussy to set up reliably [R13][R23, both HIGH — full threads read; the "abandoned in excellent condition" framing itself held at MEDIUM, search-synthesis rather than one directly fetched primary source].
• revival: the strongest, most consistently repeated argument is quiet, single-groove speed — cutting one or two grooves by hand beats setting up a router or router table for the same small job, and it raises no airborne chip stream to collect. The earlier claim of "meaningfully better control and safety on thin or narrow stock" is withdrawn: neither family is generically safer, and narrow stock is the harder workholding problem here, because it must be secured while still leaving clearance for the fence and depth stop (see how NOT to use it) [R15, MEDIUM-HIGH — forum-sourced consensus, independently corroborated at HIGH confidence by Lee Valley's own manufacturer copy's "quieter alternative to a router" framing, R17]. Honest gap, flagged directly by this run's own research: no single named, credentialed source at the depth of a Schwarz, Fitzpatrick, or Moskowitz full essay making the complete revival case for the plow plane specifically was located — the argument here is real and repeated across many voices but rests on synthesis across sources rather than one strong anchor piece, unlike the sibling Rabbet Plane entry's Bickford-anchored revival argument. Worth a targeted follow-up search in a future run.

anatomy

• the fence — the guide/registration surface riding the board's edge, setting the groove's distance from that edge; metal (screw-arm/knurled-knob locking on modern forms) or wood (wedge-locked on traditional forms). On a properly used tool, the fence alone should do the registration [R14, HIGH][R17, HIGH — manufacturer copy].
• the stems / arms — the bars joining the fence to the main body; supplied in matched pairs of differing lengths on premium forms (the Record No. 044 ships two pairs, short and long, extending fence reach to 5″; the smaller No. 043 uses a single pair reaching 4″) [R8, HIGH — catalog pages read in full]. On 17th–18th-c. English wooden plows (per Moxon), the staves are friction-fit through mortises in the body, adjusted by mallet taps and sometimes wedged for stiffness — the opposite mechanical arrangement from Continental European plows, where the staves are fixed to the body and the fence slides on them [R1][R2, both HIGH — see lineage].
• the skate — the narrow sole strip on either side of the iron that actually contacts the wood; a defining identifying feature distinguishing plow-family planes at a glance [search-synthesis, MEDIUM — not independently fetched to HIGH confidence this run]. Documented period terminology called this part a "plate," not a "skate," in 18th–19th-c. sources; "skate" is likely a later collector/user term [R2, HIGH].
• the depth stop — an adjustable stop (screw-set on metal forms, wedge or screw on wooden forms) that halts the cut at a set groove depth; present on essentially every fenced form. Notably ABSENT on Moxon's 17th-century plow — a later addition, not an original feature [R1, HIGH][R8, HIGH — named as a distinct catalog feature].
• the iron/cutter — narrow, interchangeable, sized to the groove width, supplied in sets: the Record No. 043 ships 3 cutters (1/8″–1/4″); the No. 044 ships 8 (1/8″–9/16″, plus metric options for plywood-panel grooving); the Stanley No. 45, as a full combination plane rather than a dedicated plow, shipped with 18–23 cutters across its production run [R8, HIGH][R6, MEDIUM-HIGH].
• spurs / nickers — small hardened spurs scoring/severing cross-grain fibers ahead of the iron on combination-plane forms fitted for cross-grain work. A dedicated single-purpose plow plane, being built for long-grain work, does not always carry one — a genuine mechanical distinction from the Rabbet Plane/moving fillister, whose nicker is closer to a defining feature in that sibling entry's own anatomy block [search-synthesis, MEDIUM — worth a future run verifying directly against a plow-specific patent or manual].
• the lever cap / blade retainer — holds the iron to the body; named as a distinct labeled part in Common Woodworking's own instructional diagram [R14, HIGH].
• the body / stock — cast iron (metal forms, e.g. the Veritas redesign's 9″ ductile-cast-iron body machined with a 45° blade bed) or beech/boxwood (wooden forms, e.g. ECE's beech body with a hornbeam sole) [R17, HIGH][R21, HIGH — both manufacturer pages fetched in full].

Honest gap: Patrick's Blood & Gore's dedicated Stanley plow/combination-plane page (supertool.com/StanleyBG/stan6.htm) — the canonical collector source for labeled Stanley 45/46 anatomy diagrams — is JS-gated and could not be fetched, the same blocker the sibling Rabbet Plane entry hit on the identical domain. Worth naming as a standing, repeated gap across this whole plane-family corner of the corpus rather than re-discovering it fresh each run.

variations (living)

• Traditional wooden plow (English form) — friction-fit or screw-arm staves through the body, riveted fence, historically one plow per groove width before interchangeable irons became standard. Screw-arm forms trace to 1770s England; still made new by dedicated small-batch makers today (see proof of existence / market) [R1][R3].
• Traditional wooden plow (Continental European form) — the inverted mechanism: staves fixed to the body, fence sliding on them — a genuinely different engineering answer to the same registration problem [R1][R2, both HIGH].
• Dedicated metal single-purpose plow (Record 040/043/044/050, modern Veritas) — fence, depth stop, and a set of interchangeable narrow irons, no other cutter profiles. The most-recommended choice across sourced forum debate for reliable, repeatable groove-cutting [R7][R8][R13][R23, all HIGH-MEDIUM-HIGH].
• Combination Plane (Stanley 45/46/50/55, Veritas Combination Plane) — the plow mechanism expanded with beading, fluting, tonguing, and small-rabbet cutters via interchangeable profiles; genuinely more versatile and genuinely harder to set up and master, per the sourced access debate above [R5][R6][R13][R23].
• Skewed-cutter plow (Stanley No. 46) — angled irons for improved cross-grain performance, distinct from the No. 45's straight cutters and not interchangeable with them [R5, HIGH].
• Center-wheel plow (Ohio Tool Co., Sandusky Tool Co.) — a dedicated center-mounted adjustment wheel for fence positioning, introduced 1850s, continued by Sandusky into the 1920s; the form behind the most valuable documented plow-plane sale on record [R4, HIGH].
• Match-plane pairs (tongue-and-groove) — a plow-form groove-cutting iron/plane paired with a tonguing iron/plane, both referenced off the same face for a flush joint; a dedicated "drawer bottom plane" permanently set to one groove width is a real, still-used working tool per a named forum poster [R15, HIGH]. Honest gap: no currently-in-production new match-plane pair was confirmed this run.

trades (where it appears, with trade-specific notes)

• woodworking / joinery (primary trade) — Peter Follansbee's own named-historian argument is that the plow plane is specifically diagnostic of the "joiner" trade among period woodworking specialties, because grooving for frame-and-panel construction is a joiner's signature task, not shared with carpentry or other trades [R2, HIGH — full text read].
• cabinetmaking — drawer-bottom and case-back grooves, documented across multiple sources as the single most common modern application [R14][R15].
• other trades — no source located placing the plow plane specifically in trades outside woodworking/joinery/cabinetmaking in this run's research; held as an honest, unconfirmed gap rather than asserted, consistent with the sibling Rabbet Plane entry's own trades gap.

lineage

• ancestors:
  • No single dedicated "invention" is documented. Grooving planes are attested by Roman times as a chisel fitted into a wood block, per Roger Bradley Ulrich's Roman Woodworking (Yale University Press, 2007) [R3, HIGH — well-footnoted secondary source]. The plow plane as a distinct fenced, depth-stopped tool developed gradually; the earliest known screw-arm plow planes were collected by German aristocracy in the 1570s (citing Josef Greber, Die Geschichte des Hobels, 1956), and by the mid-1500s English, Dutch, and German joiners were using plow planes generally (citing Jane Rees, Goodman's British Planemakers, 4th ed. 2020) [R3, HIGH — full text read, citations to named tool-history books].
  • The Rabbet Plane, as a contemporary author understood the mechanical relationship — not as documented descent. Joseph Moxon's Mechanick Exercises (1678–83) describes the plow, immediately following his treatment of the rabbet plane, as "a narrow Rabbet-plane with some Additions to it" — staves and a fence. That is a description by analogy to a familiar tool, and it is strong evidence of shared form and of how the two were distinguished in the 17th century. It is not evidence of invention sequence, descent, maker-to-maker transmission, or priority, and this entry no longer calls the rabbet plane the plow's "direct ancestor." ("Direct ancestor" is reserved here for documented historical transmission.) Moxon's text reads: — two square staves (arms) let through mortises in the body, 7–8 inches long, with a fence riveted to their shoulders [R1][R2, both HIGH — full text of Moxon's passage read, independently cross-verified across two sources]. Moxon's plow had no depth stop and joiners of his era kept a separate plow for every groove width — both features (depth stop, interchangeable irons) came later and are what distinguish the "modern" plow from Moxon's [R1, HIGH].
  • Regional mechanical split (English vs. Continental European) — a genuine, sourced design divergence, not a single lineage: the wooden plow was common in England and North America, where the arms are fixed to the fence and slide through mortises in the body; in typical Continental European plows the arms are fixed to the body, and the fence itself slides on them — the inverse mechanical arrangement solving the same registration problem [R1, HIGH — analysis by Christopher Schwarz][R2, HIGH — independently corroborated, citing Goodman's British Planemakers and Greber's Die Geschichte des Hobels]. Screw arms (threaded, rather than friction-fit) did not appear in England until roughly 1770, using a York-region mechanical approach distinct from earlier German screw-arm plows (citing Richard Knight, "Two Early English Screw-stem Ploughs," Tools and Trades vol. 1, 1983) [R3, HIGH].
• descendants / living variants:
  • The Combination Plane (Stanley No. 45, 1884 onward) — a direct mechanical expansion of the plow plane's fence/arm/depth-stop skeleton, with interchangeable cutter profiles added far beyond straight grooving (beading, fluting, tonguing, small rabbets) [R5][R6, MEDIUM-HIGH]. Built as its own full entry, Run 360 — which also resolved this entry's own open gap #1 below, finding the No. 45's base patent number (US 294,825) this entry had searched for and failed to locate. The No. 50 began life as a beading-only plane and had plow/grooving cutters added to its casting around 1914 — direct physical evidence of the plow mechanism being folded into a wider-purpose tool over time, not designed in from the start [R5, HIGH — full page read].
  • Match-plane pairs (tongue-and-groove) — a plow-plane-form iron pairs with a rabbet-style tonguing iron, both referenced off the same face, so the assembled joint sits flush [cross-ref, Rabbet Plane, its own R24 citation of this tradition] — a wooden, dedicated "drawer bottom plane," permanently set to one groove width and offset for a single repetitive task, is documented by a named Sawmill Creek poster (Zach Dillinger) as a real, still-used working tool [R15, HIGH — full thread read].
• contemporaries — related but genuinely different tools:
  • The Rabbet Plane — this corpus's own sibling entry (Run 331) rules on the distinction directly from the rabbet plane's own side: "a plow plane's job of running a groove down the middle of a board, away from an edge." This entry's own research, independent of that entry's sourcing, confirms the same account from a 17th-century primary source (Moxon) rather than merely restating it [R24, cross-ref, HIGH].
  • Router plane — genuinely complementary, not competing: the plow plane cuts a fresh groove from raw stock along its full accessible length, referenced off the edge by its fence; the router plane trues an already-cut groove's floor to a consistent depth off the surrounding face, and is the better tool where a groove runs into a stopped end the plow plane's own body can't fully register into [R15, HIGH — forum-sourced consensus][R25, cross-ref, Router Plane, its own kit-fit citation of the plow plane].
  • Dado Plane — a distinct, unfenced, fixed-width tool built specifically for cutting cleanly ACROSS the grain; an ordinary plow with a straight cutter and no scoring spurs is a long-grain tool, and named craft sources recommend starting a cross-grain cut with a dado plane rather than forcing such a plow against the grain [R13, HIGH — named forum poster, full thread read]. Skew-cuttered and spurred combination configurations are the documented exception — see matching [R17][R9]. Now built as its own entry, Run 361.

Petroski lens / mirror-image finding — this entry's first organizing finding. No source found in this run's research explicitly applies Petroski's "form follows failure" framework to the plow plane by name (an honest gap; do not cite this as an established external claim). What IS independently and strongly sourced: Moxon's own 1678–83 words, read directly rather than relayed through a modern paraphrase, describe the plow as a rabbet plane with two specific additions (staves + a riveted fence) — the exact mechanical delta this corpus's own Rabbet Plane entry describes from its side as the feature separating "a bare rabbet plane" from "a moving fillister." The plow plane is the rabbet plane's own fence-and-arms addition taken to its logical end: instead of registering a step at the edge, the same mechanism moves the whole cut away from the edge into the field of the board. The two entries are now mutually corroborating on the shared mechanism, sourced from opposite historical starting points (a 17th-century primary text here; modern professional craft sources there).

history

• origin — genuinely old, with the same honest dating gap the sibling Rabbet Plane entry names for its own tool. Grooving by a chisel-in-a-wood-block predates any fenced tool and is attested to Roman practice by a named classical-tools historian [R3, HIGH]. The first clearly fenced, arm-and-fence plow planes documented by named tool historians (Greber, Rees) date to the 1500s–1570s in Germany/England/Netherlands [R3, HIGH — full text read, citing named books]. No source found in this run's research identifies a specific dated archaeological or museum-held physical plow plane earlier than this documentary trail — reported as an honest gap, consistent with the sibling Rabbet Plane and Shoulder Plane entries' own dating gaps for their tools.
• Joseph Moxon, Mechanick Exercises (1678–1683): read directly (via Lost Art Press's republication of the original text with Christopher Schwarz's analysis, cross-verified independently against Peter Follansbee's own quotation of the same passage). Moxon's Section 8, "The Use of the Plow," defines the tool, its two staves (7–8 in.), riveted fence, and confirms it had no depth stop in his era — joiners kept a dedicated plow per groove width instead of one plow with interchangeable irons, a genuinely different working practice from the modern tool [R1][R2, both HIGH — full text read, independently corroborated].
• Period terminology, sourced to primary catalog/inventory documents relayed by a named period-tool historian. Peter Follansbee (professional joiner and historian) documents actual 17th-century New England probate inventory lines listing plow planes — "2 plow plaines to grove & tennant," "a Joyners plow" — and argues the plow plane is the single tool most diagnostic of the "joiner" trade specifically, because "no other trade needs it." He also relays, from correspondence with named English plane historian Richard Arnold, that the iron sole (called "skate" today) appears as "plate" in Christian Gabriel's 1791 stock list and John Griffiths of Norwich's 1852 price list — Arnold's own view is that "skate" is a later, probably late-19th-century collector/user term [R2, HIGH — full text read, named primary-source citations and a named living expert consulted].
• Named historical makers (18th–19th c.), held at MEDIUM confidence pending fuller primary verification beyond search-snippet depth: John Green (York, England, active 1750–1800) [snippet only, LOW-MEDIUM]; Thomas and Sushannah Phillipson (mid-18th-c. London, per Winterthur Museum's Dominy Collections page) [snippet only, LOW-MEDIUM]; other named English makers per search results — Greenslade, Griffiths, Marples, Mathieson, Moseley, Nurse, Preston, Routledge, Varvill — reported at snippet-level only, not independently verified this run, flagged as lower confidence [R3, LOW-MEDIUM].
• American maker history, sourced to named tool-history authors: Thomas Napier emigrated from Scotland to Philadelphia in 1774 and, with Hugh Hazlet, was probably the first American maker of screw-arm planes, c.1800 (citing Carl Bopp, The Chronicle, 2004). Israel White, Philadelphia, patented a three-arm plow plane design in 1834 — two unthreaded arms holding the fence plus one threaded arm moving it — specifically to fix the parallelism problem of double-screw-arm plows; several other named American makers pursued the same fix (Henry White, John King, David Andruss, Mockridge and Francis, William Ward, Chapin and Rust), citing John A. Moody's The American Cabinetmaker's Plow Plane: Its Design and Improvement, 1700–1900 (1981) and Herb Kean's "Three-arm Plows" (The Tool Shed no. 107, 1997) [R3, HIGH — full text read, named-book citations].
• The center-wheel innovation and its most famous surviving example: Ohio Tool Co. made the first center-adjustment-wheel plow plane in the 1850s; Sandusky Tool Co. (also Ohio) continued making center-wheel plows into the 1920s. An ebony-and-ivory Sandusky center-wheel plow, likely made for the 1876 Centennial Exposition, sold for over $100,000 at a 2005 auction — a genuine, dated, named-provenance high-water mark for the tool as a collectible object, sourced to Christopher Schwarz's own reporting [R4, HIGH — full text read, "Almost a Plane Wreck," Popular Woodworking, April 2005].
• Stanley's metal plow/combination planes — dated production table, cross-checked against a single collector reference site (Patrick Leach's "Blood & Gore," supertool.com/StanleyBG/stan7.htm — the No. 46 through No. 54 page was fetched and read in full; the No. 45's own dedicated page on the same domain was JS-gated and could not be fetched, consistent with the same blocker the sibling Rabbet Plane entry hit on the identical domain):

• Record (UK) plow planes — dated production table, sourced to the manufacturer's own catalogues/price lists via a named collector's reference site, fetched and read in full: No. 040 (1935–1943, single-purpose 3-cutter budget alternative to the 043); No. 043 (single-arm-fence briefly in 1935, then double-arm 1934–mid-1970s; 5½″, 1¼ lb, 3 cutters 1/8″–1/4″, registered design; metric cutter option offered from 1935); No. 044 (1934–1970; 8½″, 2¾ lb, 8 cutters 1/8″–9/16″, two pairs of fence arms; one of only two Record designs carrying a registered design number, No. 811,133, protected until 1951; cutters not interchangeable with any other Record plow); No. 050/050A (050: 1933–1970; 050A ran alongside from Nov. 1933 until the 050 was discontinued c.1943); later plastic-era redesigns 044C (1970), 050C (1970, 18 cutters standard), 045C (Oct. 1982–1995, single 4mm cutter standard with a conversion kit to expand into a full combination plane — the last Record-branded plow model documented; no evidence found of any Record-branded plow plane currently in production) [R7, HIGH — full page read, primary-source-derived][R8, HIGH — Record No. 043 and No. 044 catalog pages fetched and read in full].
• US patents — the No. 45's base patent, resolved. US Patent 294,825, formally titled Bench-Plane, Justus A. Traut — filed October 17, 1883, patented March 11, 1884. Its own text expressly combines beading, center-beading, plow, dado, fillister/rabbet, matching and slitting functions in one stock, and describes deployable spurs and a dado configuration — which is why it is cited in matching above for both the rabbet capability and the cross-grain exception [R27]. (This entry originally recorded the number as an actively-attempted, unresolved gap; Run 360 located it, and the stale gap language in this section, the model table, the references and the confidence block has been cleared. It is readily verifiable.) Supporting chronology from this entry's own direct DATAMP fetch of Traut's cross-reference list (datamp.org/patents/search/xrefPerson.php?id=124 — 150 patents) confirms US 293,822, "Gage for Plane-Bits" (Feb. 19, 1884), immediately preceding it [R11].
• A later Traut patent from the same mechanism family, read in full and explicitly not the primary proof for this family: US Patent 338,570, "Bench-Plane" (a molding/beading attachment), Justus A. Traut, New Britain, CT, assigned to Stanley Rule and Level Co., issued March 23, 1886. Its own text references "the plane patented to me April 21, 1885, No. 316,079" as the prior invention it attaches to. US 294,825 above is the combination-plane branch's base patent; US 338,570 is a later attachment and should not be read as primary evidence for the plow family. It does confirm Traut's continued iterative patenting around this tool family through the mid-1880s [R9, HIGH — full patent text read].
• Other DATAMP-listed patents in the same mechanism space, held at bibliographic/listing depth only, not independently read in full this run: US 318,331, "Adjustable-Faced Plane" (Edwin Walker, Erie PA, 1885 — described by a secondary source as "among the most complex of all patented planes ever produced"); US 167,772, "Improved Phillips Patent Plow Plane" (Matthias C. Mayo, Boston, 1875); US 269,968, "Siegley Combination Plane" (Jacob Siegley, New York, 1883); US 1,032,956, "Combination Plow Plane" (Jacob Siegley, Wilkes-Barre PA, 1912) [R10, MEDIUM — DATAMP-listed, bibliographic depth only, not independently fetched].
• A correction worth naming directly: "the most complex hand plane ever made" belongs to the No. 55, not the No. 45. Multiple sources apply this description specifically to the Stanley No. 55 — an evolution of the No. 45 with two fences (left and right) instead of one — not to the No. 45 itself. If a simpler framing is wanted for the No. 45, "the archetypal combination plane" or "the tool that tried to replace a cabinet full of specialty planes" is better supported than "most complex," which the sources reserve for its descendant [R12, MEDIUM — snippet-level, not independently cross-checked against a primary source].

✦ human side

• a real, named, multi-voice debate on dedicated vs. combination planes — this entry's third organizing finding, sourced across two independent forum threads. In a Sawmill Creek thread comparing the Stanley 45 against a dedicated Record 044 and the Stanley 50/78, David Weaver (named, well-known forum member) gives a mixed but honest verdict: "A 45 works fairly well as a plow plane. Not that great for anything else... The 45 has no sole and it's at common pitch and it doesn't support an iron like a single purpose plane... No other plow has a sole except one-off stuff, so that's why it's fine as a plow, i guess." He also compares cross-grain performance directly: "None of them cut that great across or against the grain, but there are work-arounds for most things (back bevel on the irons against the grain, scoring across the grain first or making starting cuts with a dado plane)." Don Dorn, same thread, on the dedicated Record 044: "I have a Record 044 and love it... They are a pleasure and fun to use — I was really amazed how fast four boards were done to place a panel in." Frank Drew, same thread, recommends the Record 778 over the Stanley 78 as the companion rabbet plane: "I agree with David on getting two planes, but I'd look for the Record 778 instead of the Stanley 78. A better tool, IMO" [R13, HIGH — full thread read, three named posters]. A second, independent Sawmill Creek thread on "Combination plane vs Plow plane" converges on the same access split (see matching — access), with one named poster's blunt 30-years-later verdict on his own Stanley 45: "There are better tools for any of the jobs it will do" [R23, HIGH — full thread read].
• Paul Sellers, relayed via a site Q&A response attributed to him, votes plainly for dedicated tools over the No. 45's other functions: asked whether an $80 Stanley 45 was worth buying instead of a dedicated plough plane, the response attributed to Sellers reads: "You could buy a plough plane for much less than that, you're not likely to use the other blades for anything as they don't work that well." [R14, HIGH — full page read, including the site's own user comment thread] A separate user on the same page describes a real, first-person struggle — clean grooves in softwood but the iron "wants to dive into" old, hard red oak — with Sellers' diagnosed fix relayed: check that the fence is parallel to the sole when locked off, since misalignment is a common, easy-to-miss setup fault [R14, HIGH].
• A real, named, cross-corpus recurring figure. Justus A. Traut, already documented in this corpus's Rabbet Plane and Marking Gauge entries as a prolific Stanley engineer (145+ patents), is confirmed here as the named designer behind the No. 45/46/50 combination-plane line as well — the same individual's inventive hand now traced across three separate tool families in this corpus, a real thread worth noting rather than re-deriving from scratch each time [R6][R9][R11, cross-corpus pattern, HIGH].
• A named, dated, extreme-value collector story. The 2005 auction of an ebony-and-ivory Sandusky Tool Co. center-wheel plow plane, likely made for the 1876 Centennial Exposition, for over $100,000 — reported directly by Christopher Schwarz, a named author already anchoring material in the sibling Rabbet Plane entry [R4, HIGH — full text read].
• injury/damage accounts — an honest, near-total gap, consistent with the pattern in the sibling Rabbet Plane entry. No source located in this run's research describes a specific, named injury from plow-plane use. Reported as an unfilled gap, not a confirmed absence, and not a finding that the tool is safe — the hazard class is built from the tool's own mechanism [see how NOT to use it — dangerous].

✦ proof of existence

• earliest documented fenced/arm-and-fence plow planes: dated to the 1500s–1570s in Germany/England/Netherlands by named tool historians (Rees, Greber) — a documentary trail, not an independently confirmed archaeological artifact [R3, HIGH — full text read, named-book citations].
• the founding primary-source description: Joseph Moxon's Mechanick Exercises (1678–1683), Section 8, "The Use of the Plow" — read directly, independently cross-verified across two sources (Lost Art Press's republication with Schwarz's commentary, and Peter Follansbee's own separate quotation of the same passage) [R1][R2, both HIGH].
• the earliest confirmed American maker activity: Thomas Napier (emigrated Scotland → Philadelphia, 1774) and Hugh Hazlet, probably the first American screw-arm plane makers, c.1800, citing Carl Bopp's named research (The Chronicle, 2004) [R3, HIGH].
• a dated, patented American mechanism fix: Israel White's 1834 three-arm plow plane patent (Philadelphia), fixing the parallelism problem of double-screw-arm designs, citing John A. Moody's and Herb Kean's named research [R3, HIGH].
• US patents in the mechanism family, this run's own direct DATAMP verification:
  • US Patent 338,570, "Bench-Plane" (molding/beading attachment), Justus A. Traut, issued March 23, 1886 — read in full directly on Google Patents [R9, HIGH].
  • US Patent 294,825, Bench-Plane, Justus A. Traut — filed Oct. 17, 1883, patented March 11, 1884; the No. 45's base patent, combining beading, center-beading, plow, dado, fillister/rabbet, matching and slitting in one stock [R27, HIGH].
  • US Patent 293,822, "Gage for Plane-Bits," J.A. Traut, issued Feb. 19, 1884 — confirmed directly via this run's own DATAMP fetch of Traut's full patent cross-reference list, immediately preceding US 294,825 [R11, HIGH].
  • US 318,331 (Walker, 1885), US 167,772 (Mayo, 1875), US 269,968 (Siegley, 1883), US 1,032,956 (Siegley, 1912) — DATAMP-listed, bibliographic depth only, not independently fetched in full this run [R10, MEDIUM].
• named, dated production runs: Stanley No. 45 (~1883/84–1962, a ~78-year run); Record No. 043 (1934–mid-1970s) and No. 044 (1934–1970); see history for the full tables [R5][R6][R7][R8].
• a dated, extreme-value auction record for a physical example: the Sandusky Tool Co. ebony-and-ivory center-wheel plow plane, likely made for the 1876 Centennial Exposition, sold for over $100,000 in 2005 — reported directly by a named author (Christopher Schwarz) [R4, HIGH].
• honest gap — no confirmed archaeological or museum record specific to the plow-plane form located this run. Consistent with the same gap the sibling Rabbet Plane and Shoulder Plane entries report for their own tools: dated documentary/patent proof for this joinery-plane family is strong; independently-confirmed museum-accession proof of the earliest wooden forms is not yet found for any of them.
• ~~the base Stanley No. 45 patent number~~ — CLOSED. US 294,825, Bench-Plane, filed Oct. 17, 1883, patented March 11, 1884. Resolved by Run 360 and carried through every section of this entry when the review was applied (Haft Run 671). It was an open gap only at the time of writing.

references

kind: primary historical text (republished) | named historian/blog | magazine (named author) | forum | manufacturer | collector reference site | patent database (DATAMP/Google Patents) | sibling corpus entry

• [R1] Christopher Schwarz, "The Use of the Plow Plane," Lost Art Press blog (2021), reproducing and analyzing Joseph Moxon's Mechanick Exercises (1678–83) text — read in full. Moxon's own definition, the English/Continental mechanical split, the two-hand technique note, the single-pass-vs-short-strokes analysis. (named author/blog reproducing a primary text, HIGH)
• [R2] Peter Follansbee, "More about plow planes," Substack (peterfollansbeejoinerswork.substack.com) — read in full. Independent corroboration of the Moxon passage, period probate-inventory citations, the joiner-diagnostic-tool argument, the "plate" vs. "skate" terminology sourced to named expert Richard Arnold. (named historian/blog, HIGH)
• [R3] Abraham Hyatt, "Who Invented The Screw Arm Plow Plane?", workingwoodenplanes.com — read in full, extensively footnoted to named tool-history books/journals (Ulrich, Greber, Rees, Knight, Moody, Kean, Bopp). (named author/blog, HIGH)
• [R4] Christopher Schwarz, "Almost a Plane Wreck," Popular Woodworking (April 2005) — read in full. The Sandusky center-wheel plow's $100,000+ 2005 auction sale. (named author/magazine, HIGH)
• [R5] Patrick Leach, "Blood & Gore: Planes #46–#54," supertool.com/StanleyBG/stan7.htm — read in full. Stanley No. 46–54 dates, specs, distinguishing features. (collector reference site, HIGH)
• [R6] Search synthesis (oldwoodworkingtools.com, old-time-tools.beehiiv.com) — Stanley No. 45 cutter counts, dates, collector value ranges. (collector/retail synthesis, MEDIUM, single-tier sourcing not cross-checked against the JS-gated supertool.com No. 45 page)
• [R7] recordhandplanes.com, production-periods page — read in full, derived from Record's own catalogues/price lists (per site author David Lynch). Record No. 040/043/044/050/050A/C dated production table. (collector reference site sourced to primary manufacturer documents, HIGH)
• [R8] record-planes.com, No. 043 and No. 044 catalog/product pages — read in full. Specs, cutter counts, arm-pair configuration, pricing (dated to a Dec. 2008 source update, flagged as dated for price figures specifically). (collector/retail reference, HIGH for spec/production data, LOWER confidence for current pricing)
• [R9] US Patent 338,570, "Bench-Plane" (Justus A. Traut, 1886) — read in full directly on Google Patents. (patent database, HIGH)
• [R10] DATAMP listings — US 318,331 (Walker, 1885), US 167,772 (Mayo, 1875), US 269,968 (Siegley, 1883), US 1,032,956 (Siegley, 1912) — bibliographic/listing depth only. (patent database, MEDIUM)
• [R11] DATAMP, Justus A. Traut patent cross-reference list (datamp.org/patents/search/xrefPerson.php?id=124) — fetched directly by this entry's own author, not a delegated research passes. Confirms Traut's patent chronology through Feb. 19, 1884 (US 293,822), immediately preceding US 294,825. (patent database, HIGH for the confirmed listing)
• [R12] workingbyhand.wordpress.com, "The Stanley No. 55: Too Complex?" — the "most complex hand plane" description applies to the No. 55, not the No. 45. (blog, MEDIUM, snippet-level)
• [R13] Sawmill Creek Woodworking Community, "Stanley 45 vs Stanley 78, Record 044" thread — read in full. Named posters David Weaver, Don Dorn, Frank Drew. (forum, HIGH — full thread read, multiple named posters)
• [R14] commonwoodworking.com, plough plane usage guide, including its own comment thread — read in full. Anatomy labeling, tear-out mechanism, the Sellers-relayed parallel-fence diagnosis, a real first-person hard-grain struggle. (technique blog + forum-style comments, HIGH)
• [R15] Sawmill Creek Woodworking Community, "Hand planes to replace powered router" thread — read in full. Named posters Mike Holbrook, Chris Griggs, James Owen, Zach Dillinger, Bruce Haugen. Router-substitution case, rabbet+plow working-pair example, dedicated drawer-bottom plane account, thin-stock sizing point. (forum, HIGH — full thread read, multiple named posters)
• [R16] Shannon Rogers, The Renaissance Woodworker — read in full. Direct, quoted statement of the plow plane's fence-reach and wide-groove-chatter limitations; the named source already anchoring cross-grain-avoidance material in this corpus's Shoulder Plane and Rabbet Plane entries. (named teacher/blog, HIGH)
• [R17] Lee Valley/Veritas, Small Plow Plane (Right-Hand and Left-Hand) product pages — fetched directly, live as of this research pass, including the "quieter alternative to a router" manufacturer framing. (manufacturer, HIGH)
• [R18] (reserved — Record No. 043/044 catalog pages, see R8; not duplicated)
• [R19] HNT Gordon & Co. product listing — search-level, not independently fetched in full this run; price (~$1,530 AUD) and the "last plane Terry Gordon will personally design" framing held at MEDIUM confidence pending a direct fetch. (manufacturer, MEDIUM, unconfirmed at full-fetch depth)
• [R20] Philly Planes (Philip Edwards, Poole, Dorset UK) — fetched directly, live product page. Small Plow Plane, £350, made to order. (manufacturer, HIGH for price/spec; the biography/waiting-list detail is MEDIUM, search-summary depth)
• [R21] ECE (Emmerich Clausing Engelbrecht), Fenced Plough Plane, sold via Highland Woodworking — fetched directly, live product page, current price $599 USD, on backorder as of this fetch. (manufacturer/retailer, HIGH)
• [R22] Wikipedia, "Router plane" — the electric router's displacement of the hand router plane, used here only as an analogy; no source found making the parallel claim for the plow plane's own displacement specifically. (encyclopedia, MEDIUM, snippet-level)
• [R23] Sawmill Creek Woodworking Community, "Combination plane vs Plow plane" thread — read in full. Independent corroboration of the access/skill split; the "There are better tools for any of the jobs it will do" 30-years-later verdict. (forum, HIGH — full thread read)
• [R24] This corpus's own Rabbet Plane entry (Run 331) — the plow/rabbet distinction (R8/Maguire citation in that entry), the "Plow/Plough Plane" open-gap naming this entry as the next candidate. Cross-referenced. Flag for a future run: Leg B's research could not independently verify the Maguire (R8) source in the Rabbet Plane entry as actually containing the plow/rabbet distinction it's cited for — the fetched Maguire fillister-plane page did not, as currently written, contain a plow-plane comparison. Worth a direct re-check against the Rabbet Plane entry's actual R8 source in a future run; not resolved or altered this run. (sibling corpus entry, HIGH for the citation existing; MEDIUM for that specific sub-claim's exact sourcing)
• [R25] This corpus's own Router Plane entry (protected folder) — its own kit-fit citation of the plough plane as the tool that "runs grooves along a board's length from scratch," which the router plane cannot replace. Cross-referenced, not re-derived; this session could not write to that folder. (sibling corpus entry — cross-link only, not independent corroboration)
• [R26] CCOHS, Working Safely with Sharp Blades or Edges — https://www.ccohs.ca/oshanswers/safety_haz/sharp_blades.html — supports pre-use inspection, mechanically held and stable work, keeping body parts out of the possible slip path, and avoiding excessive force. Basis for the rebuilt dangerous-misuse class. (national OHS authority, HIGH)
• [R27] US Patent 294,825, Bench-Plane, Justus A. Traut — https://patents.google.com/patent/US294825A/en — filed October 17, 1883, patented March 11, 1884. The No. 45's base patent; expressly combines beading, center-beading, plow, dado, fillister/rabbet, matching and slitting in one stock, and describes deployable spurs and a dado configuration. Resolves this entry's former open gap #1. (primary patent document, HIGH for what it directly shows)

⚠ Evidence-grade note (added when the reviewer's 2026-08-03 review was applied, Haft Run 671). Several grades above were inflated, and the rule for this entry is now explicit. Moxon's text and the patent documents are graded high for what they directly show, and no further. Named tool histories and manufacturer pages are high or medium according to scope — a maker's page is authoritative about its own product and about nothing else, and its product facts decay, so they are dated. Sawmill Creek and other forum threads are practitioner evidence, however completely the thread was read — reading a whole thread does not raise testimony to primary-document authority, and several matching rules in this entry had been promoted from single forum remarks (the 3/4″ stock gate and the 3/8″ width ceiling among them; both are now withdrawn or bounded). This corpus's own sibling entries ([R24], [R25]) are cross-links only and are circular as evidence — where this entry said a claim was "independently corroborated" by a sibling file, it was corroborating itself. Search-synthesis and snippet-only sources cannot carry exact dates, model tables or market superlatives at high confidence; the unconfirmed Stanley No. 240 and No. 246 have been removed from the model table rather than carried as quasi-content. Every retained citation owes a title, author or institution, a URL and an access date; those lacking them are flagged here rather than left to look verified.

images this entry needs (spec for Forge — see tickets)

• The mechanism-family diagram. A single labeled diagram showing the shared fence-and-depth-stop skeleton across three related tools: the Rabbet Plane (fence sets width, cuts a corner step), the Plow Plane (fence sets edge-distance, cuts a middle-of-field channel), and a Combination Plane (same skeleton, many interchangeable cutter profiles). Caption: "one mechanism, three jobs."
• The English vs. Continental mechanical split. A two-panel diagram: Panel 1, an English-form plow with arms fixed to the fence sliding through the body; Panel 2, a Continental European-form plow with arms fixed to the body and the fence sliding on them. Same tool, inverted mechanism.
• The groove vs. rabbet cross-section. A simple side-by-side cross-section: a rabbet (open-sided step at a corner) next to a groove (fully enclosed channel in the middle of a board's field) — resolving the corpus's own documented confusion between these two visually related but mechanically distinct cuts.
• (optional) The access-split infographic. A simple two-column comparison: dedicated single-purpose plow (Record 044/Veritas — two-hand technique, fast setup) vs. combination plane (Stanley 45 — many cutters, real learning curve, the sourced "abandoned in excellent condition" collector pattern).

The reviewer's corrections (9)

• BLOCKER — 1. Replace the empty safety class and unsafe comparative claim — Exact claim: “dangerous (misuse that injures the user) — an honest, near-total gap,” plus the revival claim that a plow plane offers “meaningfully better control and safety on thin or narrow stock” with “no dust collection needed.”
• SHOULD-FIX — 2. Correct the universal tool definition — Exact claim: Plow planes are defined as “bevel-down planes fitted with a fence, a depth stop, and interchangeable narrow irons.”
• SHOULD-FIX — 3. Remove the direct-ancestor claim — Exact claim: “The Rabbet Plane is the plow plane's own named direct ancestor in the historical record,” proved by Moxon's “a narrow Rabbet-plane with some Additions.”
• SHOULD-FIX — 4. Repair the rabbet prohibition — Exact claim: “don't use it to cut a rabbet or fillister at a board's edge/corner — that's the Rabbet Plane's job”; a plow “cannot replace” a rabbet plane.
• SHOULD-FIX — 5. Qualify the cross-grain and dado boundary — Exact claim: A plow is “fundamentally a long-grain tool,” is “not well suited” for dadoes, and users should not reach for it for cross-grain work.
• SHOULD-FIX — 6. Remove the absolute “cannot true or deepen” rule — Exact claim: A plow plane “doesn't true one already cut,” and users should not use it to “true or deepen a groove/dado already cut by another tool.”
• SHOULD-FIX — 7. Remove unsupported thickness and width thresholds — Exact claim: The plow is “really for” thin panel stock and is not the first reach above 3/4-inch stock; dedicated plows should not cut grooves “much past 3/8–1/2 inch,” where a combination plane's “wider support” is better.
• MINOR — 8. Correct the No. 45 patent status throughout — Exact claim: The history, proof, references, and confidence blocks repeatedly call the March 11, 1884 No. 45 patent number unresolved, although the open-gaps block later says Run 360 resolved it as US294,825.
• SHOULD-FIX — 9. Regrade evidence and add reviewable citations — Exact claim: Full forum threads, collector pages, sibling corpus entries, and blogs are repeatedly graded HIGH, while the references omit direct URLs.