Skew Chisel

identity

• name: Skew chisel ("skew") — a woodturning tool: a bar of hardened steel (rectangular, oval or round in section) with a cutting edge set at an angle to the tool's long axis, presented against a tool rest on spinning spindle-oriented work [SK9][SK27][SK29].
• family / category: a spindle-turning cutting tool. Its kit companions depend on the branch and the instructor: spindle-turning kits, bowl-turning kits and a named instructor's beginner kit are different records, not one exact five-tool standard [SK22][SK24][SK27].
• one-line: a spindle-turning tool whose controlled planing cut can leave a very clean surface that often needs little, and sometimes no, sanding; it can catch abruptly when a corner or too much unsupported edge engages, so it is used inside full lathe safety and taught with supervised practice [SK27][SK29][SK30].
• naming note. Moxon's joinery text — first issued in the 1677–1680 serial run and checked here in the 1703 third edition — documents a skewed chisel form (the "skew former"), a joiner's paring chisel with an angled edge [SK1][SK38][SK39]. No source located shows the lathe skew chisel descends from it; they share a geometric idea, not a documented lineage.

Matching fields: work_orientation, workholding, operation, presentation_mode, stock_profile, edge_profile, corner_treatment, rest_contact_geometry, included_bevel_angle, skew_angle, cutting_zone, skill_condition, rest_condition, PPE_training_condition.

✦ how NOT to use it

• not-for:
  • ordinary faceplate or bowl cutting. Use the skew's cutting edge for spindle-oriented work, not ordinary faceplate/bowl cutting. A specialized scraper-mode use is a separate operation and should appear only when an authoritative project instruction specifies the presentation, workholding, speed, rest and protection. Never infer bowl suitability from the existence of scraper-mode examples [SK20][SK29].
  • roughing a square blank as a default — the spindle roughing gouge's job; a peeling cut can size suitable stock under instruction [SK27].
  • final separation as a default — the parting tool's job [SK24].
• dangerous — full lathe safety, then skew-specific catch control. No skew-specific incident narrative was located; consequences below are stated from the mechanism and AAW guidance, not from comparative incident data. Controls, following AAW safety guidance [SK30]:
  • no instruction — obtain competent, hands-on instruction before relying on written guidance; practise on sound, modest-diameter spindle stock.
  • unsound or insecure work — inspect the blank; mount it securely between appropriate centres or in an appropriate spindle-oriented holding method.
  • wrong speed — use a speed suitable for diameter, balance and condition.
  • no clearance check — rotate the work by hand to confirm clearance before startup.
  • a distant, loose or cluttered rest — set the rest close, lock it, keep it clear; put the tool on the rest before it contacts the work.
  • standing in the line of fire — stand outside the likely line of fire at startup and after any change.
  • no eye/face protection — wear eye protection and operation-appropriate face protection; a face shield mitigates injury but does not make insecure mounting, excessive speed, an unsuitable tool or poor body position safe.
  • entanglement — tie back hair; remove loose clothing, jewellery and gloves around rotating work.
  • adjusting a running lathe — stop the lathe before moving the rest, measuring, changing the setup or clearing entangled waste.
  • ignoring warning signs — stop for unexpected vibration, movement or noise.
  • the catch (skew-specific layer). A skew can catch abruptly when a corner or too much unsupported edge engages — e.g. presenting the long point without control, or cutting with the edge unsupported by the bevel. Consequences range from a spiral track or spoiled detail to loss of control. Secure workholding, suitable speed, rest support, the correct cutting zone and instruction are required [SK9][SK10][SK27]. This corpus's Powered Wood Lathe entry treats skew catches as a load-bearing example [SK23 cross-link]. (Earlier claims that the skew is the lathe tool "most likely to violently catch," with the corpus's "strongest" danger signal, and that catches are categorically "catastrophic," are removed: no comparative incident data supports a ranking.)
• damaging:
  • a bevel not riding properly leaves a torn or burnished surface [SK10].
  • reprofiling a badly damaged skew on a belt system can consume several belts (a Robert Sorby forum case cited in this corpus's ProEdge entry) [SK22].
  • regrinding to an arbitrary "standard" bevel instead of the maker's or a named system's geometry changes sharpness, durability, bevel support and catch behaviour [SK31][SK33].
• beginner-trap:
  • letting the long point dig in during a planing cut [SK9][SK10][SK13][SK14].
  • losing bevel contact, or presenting the edge at the wrong height [SK9][SK10].
  • extrapolating planing-cut technique to V-cuts, beads, coves, peeling, facing or pommels without instruction [SK27].
  • abandoning the tool after one catch rather than practising with instruction [SK14].
• misuse by analogy to related tools:
  • scraper habits with a skew in cutting mode — the skew's cutting presentation relies on bevel support; Haft's reasoned inference from the sourced mechanics, flagged as such.
  • using a parting tool like a skew — see the V-Tool - Parting Tool entry [SK24].
  • reshaping a Japanese kiwa nomi into a skew — this corpus's Paring Chisel entry: "if you want a skew chisel, buy a skew chisel" [SK21].
  • treating oval and rectangular skews as technique-identical — Lacer: an oval's presentation changes as it is rolled [SK2].

correct use

• inside full lathe safety first — see dangerous for the system checklist; the skew-specific technique below is one layer within it [SK30].
• planing cut — rub the bevel and engage a controlled middle portion of the edge, typically with the tool at about 45° to the axis; avoid letting the long point or an unsupported edge section self-feed [SK9][SK10][SK27]. The bevel should glide lightly rather than be forced [SK10].
• beads, V-cuts, fillets, tapers, end-grain facing, peeling and pommels — use a named technique from competent instruction rather than extrapolating from the planing cut [SK15][SK27][SK29]. Sorby names "beads, pummels and v-cuts, e.g. stair balustrading and chair legs" [SK15].
• coves — AAW includes coves among skew functions; treat them as advanced and technique-specific [SK27].
• finish — a sharp skew in a controlled planing cut can leave a very clean spindle surface that often needs little, and sometimes no, sanding before the chosen finish; species, grain, sharpness, vibration, cut direction and skill all affect the result [SK27][SK29].
• the catch, mechanically: "A catch is almost always caused by the toe or heel digging in when it shouldn't. This happens when the tool is not properly supported by the bevel or when you present the wrong part of the cutting edge to the wood" [SK10]. This corpus's Powered Wood Lathe entry describes the long point digging and spiralling down the work [SK23 cross-link].
• sharpening — geometry- and operation-dependent; follow the maker's or a named system's geometry [SK31][SK33].

✦ matching — for the app's read

Structure: operation → work orientation → presentation → skill/safety condition → partner tool.

• does (core): planing cylinders and tapers; beads; V-cuts and fillets; end-grain facing on a spindle; shallow details; pommels (square-to-round transitions) — spindle-oriented work, cutting presentation, after instruction [SK15][SK27][SK29].
• does (advanced, technique-specific): coves [SK27]; peeling cuts that reduce and size suitable spindle stock [SK27].
• suits: spindle-oriented work — table and chair legs, newel posts, balusters, pens, handles, finials [SK15]. Default to spindle orientation; reject generic bowl/faceplate cutting matches.
• kit-fit:
  • pairs with: a spindle roughing gouge (the normal match for taking a square blank round where safe); a spindle gouge for shaping; a parting tool for sizing and final separation [SK24]; calipers.
  • alternatives: a spindle gouge for some smoothing and detail work; other slicing tools and processes can also produce finish-ready surfaces. Direct shearing/planing with a skew can preserve crisp details and reduce sanding [SK27].
  • not the default for: final separation — use a parting tool unless a named method supports the skew operation and leaves a safe attachment strategy; roughing a square blank — a spindle roughing gouge is the normal match.
  • kits: spindle-turning, bowl-turning and a named instructor's beginner kit are separate records [SK27][SK22][SK24].
• not-for (project-keyed): ordinary faceplate/bowl cutting — AAW's glossary describes the skew as a spindle tool, not for faceplate work, and an AAW forum consensus warns that "catches from using a skew chisel in cutting mode on a bowl can be dangerous no matter the experience level" [SK20][SK29]. Hollow forms.
• access: appropriate for a beginner who has lathe safety instruction, a securely mounted spindle blank, a suitable rest and speed, a sharp skew, and supervised practice cuts. Do not recommend as an unsupervised first contact with a lathe [SK27][SK30]. Practitioner views on when to introduce it differ (see human side).
• revival: experienced turners value the planing-cut surface and crisp details, and the skew holds a recognized skill-badge place in turning instruction [SK13][SK22][SK27].

anatomy

• cutting edge — straight (or curved, on radius skews) and set at an angle to the long axis; a skew angle of roughly 70–80° to the axis is a common community range [SK9][SK10]. Record it as a dimension (skew_angle), not an identity rule.
• long point (toe) and short point (heel) — engaging the long point, or too much unsupported edge, is a common route to a catch [SK9][SK10][SK27].
• cutting zone — for a planing cut, a controlled middle portion of the edge is engaged with the bevel rubbing [SK10][SK27].
• bevel — usually ground on both faces. No single included angle is universally correct: recommendations vary with steel, stock thickness, wood, cut and teacher. Robert Sorby's ProEdge instructions use 15° per side as a default skew setting (about 30° included) [SK33]; community sources cite about 40–45° included [SK9][SK10]; this corpus's ProEdge entry records a 40° included convention attributed to Allan Batty [SK22]; AAW documents substantially different practitioner grinds for different work [SK31][SK32]. Use the maker's specification or a named instructional system, preserve the existing bevel until there is a reason to change it, grind symmetrically unless the design says otherwise, and record the intended work with every angle. Sorby says its standard skew's rolled bevel-transition edges "help turners avoid catching an edge" — attributed maker claim [SK15].
• cross-section — rectangular, oval or round (see variations) [SK15][SK27].
• handle — long (Sorby's chart: 14"–21" overall), for two-hand control on the rest [SK15].

variations (living)

• Rectangular (standard) skew — Sorby: "more weight... superb for spindle work e.g. newel posts and table legs" [SK15]. AAW recommends a 3/4" or 1" rectangular skew for a new turner [SK27]. Lacer prefers it as easier to sharpen consistently and stiffer [SK2].
• Oval skew — rest glide (Sorby) [SK15]; Cook's preferred beginner profile; Lacer and AAW note sharpening and stability tradeoffs, and Lacer notes the presentation changes as the tool is rolled [SK2][SK27].
• Round skew — light, small sizes for production work [SK15].
• Curved-edge / radius skew — Raffan design, Henry Taylor; Packard: "The tool length of these skews is about 7" with the thickness ranging from 3/16" to 5/16"" [SK16][SK35].
• Radiused-corner / rounded-edge skews — D-Way, Henry Taylor [SK4][SK37].
• Steel tiers — HSS; cryogenic HSS and M42 (Crown); powder-metallurgy CPM-10V (Thompson), sold unsharpened because "the diameter of my grinding wheel won't be the same as yours" [SK17][SK19].

trades

• Spindle and production woodturning — legs, balusters, newel posts, pens, handles, finials [SK15].
• Furniture-making with in-house turned parts — pommels on turned legs [SK15].
• Woodturning instruction — a large body of named-instructor material (Raffan, Batty, Lacer, Cook, Darlow) and AAW teaching material [SK2][SK6][SK12][SK27].

lineage

• relatives and early records:
  • The joiner's skewed chisel (Moxon) — see naming note. Applied by hand to static wood; not shown to be the lathe skew's ancestor [SK1][SK38].
  • Early turning-tool records. Peter C. Welsh's Smithsonian survey cites a 1709 York County, Virginia probate inventory (John Crost) listing "a dozen turning tools and mortising chisels" — an early English-colonial probate record of a dedicated group of turning tools; it does not identify a skew chisel and is not shown to be the earliest such record [SK1].
• modern design variants — three separate fields, not three catch-reduction lineages:
  • rest-contact geometry — oval section and rounded long edges. Robert Sorby says its oval profile "allows the tool to glide effortlessly along the tool rest without fear of the edges dragging" [SK15][SK34]. Henry Taylor's Hamlet line offers oval and rolled-edge skews [SK37]. The documented benefit is reduced rest drag, which can improve control; it is not proof that the workpiece is less likely to catch. Tradeoffs (AAW): the oval is less stable for some facing/V-groove work and can be harder to sharpen consistently [SK27]. Nick Cook teaches the oval to beginners, reasoning that its curved edge keeps the centre of the edge ahead of the toe and heel — "less likely to get a catch" — a teacher's interpretation [SK2].
  • cutting-edge profile — curved/radius edge. The Richard Raffan-designed skews from Henry Taylor (sold in the US as "Radius Skews" by Packard Woodworks) use a curved edge; Henry Taylor describes curved/radius edges as less prone to catches and markets the radius skew as beginner-friendly [SK3][SK16][SK35][SK36]. Attributed maker claim, not independent incident evidence.
  • corner treatment — radiused corners or rounded bottom edge (e.g. D-Way "full radius" bottom edge; Henry Taylor "Rounded Edge") — aimed at smoother movement on the rest [SK4]. Any catch-reduction link is maker claim or inference.
  • Round section — Robert Sorby's light ¼"–½" round skews, marketed as "highly manoeuvrable" for production work [SK15].
• related lathe tools:
  • Parting tool — the default for final separation; that entry warns that using a parting tool "like a skew chisel" without bevel discipline invites the same catch mechanics [SK24 cross-link].
  • Spindle gouge / spindle roughing gouge — Alan Lacer reports Rude Osolnik telling him early on to "throw that damn thing away, you can do everything on a spindle with either a big roughing gouge or the ½" spindle gouge"; Lacer disagreed and became a leading skew advocate [SK2]. (Bowl gouge: see Bowl Gouge.)

Petroski lens — stated with its limits. Makers explicitly frame some skew designs around control problems: Sorby's oval profile around rest drag, Henry Taylor's radius skew around catches [SK15][SK35]. These are maker rationales for specific products; they do not establish a single design history driven by the catch, and no comparative incident data was located.

history

• Moxon (1677–1680 serial; 1703 third edition checked): a joiner's skewed chisel form, not a lathe tool [SK1][SK38][SK39].
• No period (17th–18th century) text was identified in the sources checked that names a "skew chisel" as a lathe tool.
• No origin patent was identified in the sources checked. US 232,634, "Gage-Chisel for Wood-Turning" (Thomas S. Durgin, 1880), is a sizing/calibration turning tool, not a skew [SK5].
• Holtzapffel & Co.'s Turning and Mechanical Manipulation is a lead for period skew descriptions; not checked [SK25].
• Makers today: Robert Sorby (Sheffield; company registered 1828) and Henry Taylor Tools (Sheffield; company copy cites an 1834 forge) currently make skew chisels [SK8][SK15][SK25]. Company founding dates do not date a particular skew design, and current product pages prove present availability and the maker's present description, not uninterrupted lineage. Design chronology would need dated catalogues, patents, trade literature or company archives.

✦ human side

• Richard Raffan — author of Turning Wood; his Fine Woodworking video Understanding Woodturning Catches (2014) begins with the skew chisel, per the publisher's summary ("Beginning with the skew chisel, Raffan demonstrates techniques for smoothing cylinders, as well as cutting beads and V-grooves"); his own words are paywalled and not quoted [SK6].
• Allan Batty — spelled Allan Batty by AAW and Craft Supplies USA [SK12][SK40]; called "the master of the skew chisel" in a Sawmill Creek thread cited by this corpus's ProEdge entry [SK22]. Craft Supplies USA describes his instruction as covering "the makeup of the skew chisel and the six basic cuts everyone should know... to produce superb results without common 'dig-ins'" [SK12]. (An earlier version treated "Alan/Allan" as unresolved; normalized to Allan Batty. The ProEdge entry's "Alan" spelling should be reconciled.)
• Alan Lacer — a different turner (one L); AAW past president, teacher and writer. His Osolnik anecdote (see lineage) and his "Lacer Signature Skews" made by Hamlet of Sheffield; instructional DVD "The Skew Chisel: The Dark Side, The Sweet Side" [SK2]. Kept as a separate record from Batty.
• Nick Cook — AAW contributing editor; co-wrote "Skew vs. Skew" (American Woodturner, Summer 2004) with Lacer — two teachers described as "master skew practitioners" who disagree on oval versus rectangular for teaching [SK2].
• Mike Darlow — Fundamentals of Woodturning, recommended in an AAW forum thread alongside Raffan's Turning Wood [SK7].
• reputation. Trade and instructional blogs describe the skew as "probably the most feared tool in woodturning" and say "Most turners pick up a skew, experience a dramatic catch, and put it back in the rack forever" [SK13][SK14] — reputation, not incident data.
• the beginner question is a live disagreement. AAW's Skew Chisel Primer recommends a 3/4-inch or 1-inch rectangular skew when choosing one for a new turner, and AAW beginner resources teach skew practice [SK27]; Henry Taylor markets its radius skew as beginner-friendly [SK35]; Cook teaches the oval first [SK2]; other teachers start students on the roughing gouge. Practitioner preferences about sequence are recorded as disagreement, not fact.

✦ proof of existence

• Moxon's skewed chisel form — joinery text, 1677–1680 serial, checked in the 1703 third edition; not a lathe tool [SK1][SK38][SK39].
• Early turning-tool record — the 1709 John Crost probate inventory, "a dozen turning tools and mortising chisels," unspecified by type [SK1].
• Turning-tool patent (not skew-specific) — US 232,634, Durgin, 1880 [SK5].
• Search results, stated neutrally: no origin patent and no museum accession record for a skew chisel were identified in the sources checked (Google Patents, DATAMP; Smithsonian, Mercer, V&A searches).
• Current manufacture — Robert Sorby, Henry Taylor/Hamlet, Crown, Thompson, Penn State Industries list skew chisels today [SK15][SK16][SK17][SK18][SK19][SK37].

references

SK27–SK40 were added in Run 678 from the reviewer's named sources and are applied at the level of his 2026-08-01 summary; Haft did not re-open them this run.

current market (volatile — observed 2026-07-23, not rechecked)

The reviewer's corrections (11)

• BLOCKER — 1. Rebuild safety around the complete lathe system — Exact claim: Safety is organized chiefly around the skew catch, with the tool described as the lathe tool “most likely to violently catch.”
• BLOCKER — 2. Remove unsupported comparative-danger superlatives — Exact claim: The skew has the “strongest” dangerous misuse signal and is the tool “most likely to violently catch,” with catches described categorically as catastrophic.
• BLOCKER — 3. Correct the blanket beginner-exclusion rule — Exact claim: The skew is “strongly NOT beginner-safe as a first tool,” presented without meaningful dissent.
• BLOCKER — 4. Bound the faceplate/bowl prohibition precisely — Exact claim: “Never use on bowl or faceplate work of any kind.”
• SHOULD-FIX — 5. Replace the universal “zero sanding” finish promise — Exact claim: A skew produces a “glass-smooth, zero sanding” surface that nothing else replicates.
• SHOULD-FIX — 6. Separate cutting-edge catch behavior from tool-rest drag — Exact claim: Oval section, Raffan-style curved edge, and radiused corners are three independent catch-reduction lineages.
• SHOULD-FIX — 7. Make bevel and skew angles conditional — Exact claim: A roughly 70–80-degree skew angle and 40–45-degree included bevel form the practical standard.
• SHOULD-FIX — 8. Correct the Moxon and Crost priority claims — Exact claim: Moxon (1703) is the earliest documented skewed edge on any chisel-family tool, and John Crost's 1709 probate record is the earliest confirmed dedicated turning-tool set.
• MINOR — 9. Resolve Allan Batty's name and distinguish practitioners — Exact claim: “Allan/Alan Batty” is presented as unresolved.
• SHOULD-FIX — 10. Repair app matching, kit language, and volatile market data — Exact claim: The skew “cuts coves,” can “part stock in a pinch,” belongs to an exact standard five-tool kit, and has present prices treated as stable facts.
• SHOULD-FIX — 11. Remove negative-search and current-catalog history inferences — Exact claim: Absence of a found patent or museum example, plus current products and maker founding dates, establishes continuity or the lack of a patented origin.