# Dowel & Tenon Cutter (Hollow Auger)

Hewn Tool Library · https://hewn.build/tools/dowel-tenon-cutter-hollow-auger

Corrected: An independent reviewer read this entry and found corrections. They have been applied to the text, and the reviewer re-checked the correction that mattered most for safety and found it done; the others have not been re-checked yet. The list at the end is the record of what changed.

Cite as: "Dowel & Tenon Cutter (Hollow Auger)." Hewn Tool Library, hewn.build/tools/dowel-tenon-cutter-hollow-auger. Reviewed 2026-09-19.

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## Identity

- **Core definition.** A family of tools that shape a tenon on the end of a stick or spindle by rotating a bladed housing **around** the workpiece, the geometric inverse of an auger or drill bit, which bores **into** material. Depending on the model, the result is a cylindrical tenon, a cylindrical tenon with a sloping or radiused shoulder, or a true tapered tenon. — [[Dowel Maker]], Correct Use; US105,896 (1870); US6,004,082 (1999).
- **"Dowel and tenon cutter" is a family label, not one operating method.** Historical hollow augers, wooden chairmaker's cutters, modern drill-driven cylindrical-tenon cutters, hand-operated tapered-tenon cutters and continuous dowel cutters all shave around the outside of stock, but they differ in the surface produced, the drive, the work holding, the capacity and the safety controls. They are kept apart below.
- **Three shapes that are not interchangeable.** A *tapered tenon* changes diameter along its length. A *sloping or radiused shoulder* is only the transition from full stock to a *cylindrical* tenon. A cylindrical tenon with a conical shoulder does not fit a tapered mortise the way a true tapered tenon does.
- **A name that misleads.** The 19th-century American trade name "hollow auger" borrows the word "auger" though the tool does not bore. Smithsonian NMAH holds a surviving example under the object name "Hollow Auger" (below); that record shows the period name in use, nothing more.
- **Two architectures solving a related problem.** (1) **Shop-made wooden-bodied forms** (the witchet, rounding plane, stail engine, trapping plane, trenail rounder; see [[Dowel Maker]]). The exact mechanism and output vary by tool and are not all the same; this entry does not treat them as one. (2) **Factory-made adjustable metal hollow augers**, patented in America from at least 1859 in the sources checked, brace-powered, sold to chairmakers and wheelwrights. These are related solutions to the same job; no evidence was found that one descended from the other.
- **Modern Veritas / Lee Valley forms, separated.**
  - **Power Tenon Cutter** (US6,004,082, Ruhlmann & Aziz, 1999): a cylindrical tenon with a shoulder "that curves from the tenon to the largest cross-sectional dimension of the work piece on the same radius as the cutter blade," driven "by hand with a brace or utilizing an electric drill motor" (patent text, read directly).
  - **Mini Tenon Cutter** (US6,099,211, Lee & Aziz, 2000): "used with an electric drill motor, and it forms a cylindrical tenon with a sloping shoulder" (patent text, read directly). The current product page: "All sizes have a straight blade that cuts a 60° shoulder tenon," six diameters 1/4" to 9/16", "For use in an electric drill, not a drill press" (read directly). **This is not a tapered-tenon tool.**
  - **Tapered Tenon Cutter** (hand-operated): a separate product that tapers the tenon along its length, with its own instructions and design-patent metadata `[manual, relayed]`.
  - **Dowel and Tenon Cutters** (zinc-alloy body, curved adjustable blade, 3/8", 7/16", 1/2"): the product page says they put tenons on turnings "like a hand-held pencil sharpener" and "can also be used with a power feed to make accurate dowelling," with an optional straight blade, sold separately, for tapered tenons (read directly).
- **Dowel vs. tenon is model-specific.** A forum claim that "a tapered tenon cutter will cut straight tenons also. Just keep running the wood through the cutter and it will come out as a dowel" (Bob Glenn, Sawmill Creek) is one user's statement, not a family rule. Some bodies have blind or limited-depth bores and cannot make continuous dowel; Lee Valley's hand Tapered Tenon Cutter instructions warn against power-feed dowel-making because sustained use causes extreme heat, and identify a curved dowel blade only for the three smallest bodies `[manual, relayed]`. Make dowels only with a model, blade and feed the maker explicitly supports.
- **The reamer cuts the other half of the joint.** The reamer enlarges and tapers the *mortise*; the tenon cutter shapes the *tenon*. They are often sold as a pair, but are mechanically different tools, and a reamer must match the tenon's included angle and size system; "same maker" alone is not a compatibility specification. A Lost Art Press commenter corrected a casual "Veritas reamer" reference, noting a generic rebranded reamer is shaft-too-soft for hand-brace use, "you'd need to use a square-taper adapter," versus Veritas's brace-rated "Pro Taper Reamer." — Lost Art Press, "Chairmaking on the Cheap(er), Part 1," comment thread. *(The reamer has its own entry, [[Taper Reamer (Chairmaking)]], Run 615: Veritas's 12.8° included angle vs. the Starr-lineage 6° tools of Bizzarri and Tim Manney.)*

## How NOT to use it (the heaviest section)

**not-for**
- **Not for square-shouldered tenons** from a cutter that makes a sloping or radiused shoulder (Peet's thread).
- **Not for full-length dowels** on a model whose bore or maker does not support it; on the hand Tapered Tenon Cutter, not by power feed, because of heat `[manual, relayed]`. Use a dowel plate or a supported dowel cutter (see [[Dowel Maker]]).
- **Not for the mortise side of the joint.** A reamer shapes the mortise.
- **Not in a drill press** where the maker says so (Veritas Mini, read; Veritas Power `[manual, relayed]`).

**dangerous (injures the user)**
- **This is a sharp-blade, rotating, high-torque tool, and the hazards follow from the mechanism whether or not an injury story was found.** The family combines a sharp exposed blade that is handled and adjusted by hand, a rotating body, drill or brace torque, sharp shavings, and stock that can catch, spin or lever loose.
- **Powered cutters: hand-held stock, torque reaction and ejected stock.** Holding stock by hand against a drill-driven cutter exposes the user to the drill's torque reaction, spinning or ejected stock, loss of alignment and contact with the blade or rotating body. Clamp the stock `[manual, relayed]`; never hand-hold it. Support long stock so it cannot whip or lever itself loose.
- **Shank failure from misalignment, overload or excess speed.** Misalignment and movement create high side loads that can break the shank; excess speed and overload can overheat and ruin the blade `[manual, relayed]`. Keep the drill aligned, the speed in the manual's range, the stock within capacity, and stop at the first vibration, binding, overheating or irregular cut.
- **Vintage hollow augers in a power drill.** Two named LumberJocks repliers reject this; Smitty_Cabinetshop names the mechanism as imbalance "at higher RPMs." Do not power-drive a vintage tool of unknown rating.
- **Before every use:** inspect the blade, body, shank, screws or insert, the cutter setting and the chucking surfaces; do not use a cutter with a cracked body, bent shank or loose blade. Seat the shank securely in the chuck. Bizzarri notes that excessive torque on the adjustment screw "can pull the screw insert from the body," so a loose or stripped insert is a reason to stop.
- **Blade work is power-off work.** Remove the drill's battery or unplug it before adjusting, sharpening, clearing chips from or handling the blade. Handle the blade by its non-cutting faces; the Tapered Tenon Cutter instructions carry their own sharp-blade warning `[manual, relayed]`.
- **Body and clothing.** Wear eye protection. Tie back long hair; remove jewelry; keep sleeves and loose clothing away from the rotating body and chuck. Keep hands clear of the cutter mouth and the rotating body while it turns.
- **Stop before clearing.** Stop the drill fully before clearing chips or investigating chatter; do not reach toward a turning cutter.
- **Shoulder cleanup.** Bizzarri: "A spokeshave is more dangerous — it is difficult to tell when you are cutting the tenon itself."
- **Off-label rotating cutters.** Do not move a plug cutter or a drill-press instruction into a handheld setup, or one tool's operating envelope onto another.

**damaging (ruins the tool or the work)**
- **Tearout and chatter from an old or worn mechanism.** A Lost Art Press reader reports "a decent amount of tear out" from an older E.C. Stearns-style hollow auger; Schwarz calls the modern Veritas design better.
- **Overheating the blade** from excess speed, overload or sustained dowel feed, which ruins the edge `[manual, relayed]`.
- **Overreaming the paired reamer.** Schwarz: "People ream for way too long, which burnishes the hole and cooks the reamer," made worse by power-drill speed.
- **Setting the cutter too tight** (Andy Glenn's batch of cherry spindles, corrected with a spokeshave pass).
- **Pulling the screw insert** with excessive torque (Bizzarri).
- **Buying a known-bad product.** Schwarz: "Don't buy the Lumberjack tenon cutters. Just don't."

**beginner-trap (looks fine until it isn't)**
- **★ Off-axis, off-center tenons from a wandering brace or drill axis.** Belair's 2017 account, Schwabacher's diagnosis and fix, Schwarz's 2023/2024 posts ("many people end up with tenons that are slightly off-center. Or worse, wildly off-axis") and Liberman's 2025 fixture all point to the same cause: the driving axis must stay aligned with the stock's axis, by feel or by a jig. On a powered cutter this is also how a shank gets side-loaded to failure `[manual, relayed]`.
- **Mistaking a sloping shoulder for a taper.** The Veritas Mini's 60° shoulder sits on a cylindrical tenon; it will not fit a tapered mortise like a true tapered tenon.
- **Assuming the tapered joint self-tightens.** Per Bizzarri's dissent (History), a joint cut loose in the hope use will tighten it is a joint that will fail.
- **Confusing a sloping/radiused-shoulder cutter with a square-shoulder need** (Peet's thread).

**lineage-misuse (treating it like an ancestor, descendant, or rival)**
- **★ Treating a "hollow auger" like a boring auger.** It does not bore; it rotates a cutting edge around the stock end. Boring habits (straight axial push, as with a twist bit or [[Auger]]) are the wrong mental model.
- **Treating a vintage brace-rated hollow auger like a modern drill-rated cutter.** The modern Veritas Power and Mini cutters are designed for an electric hand drill within stated limits; a vintage hollow auger of unknown rating is not.
- **Treating one cutter's instructions as the family's.** Bizzarri's hands-only hold is for his wooden hand cutters; the Veritas powered cutters require clamped stock `[manual, relayed]`.
- **Confusing the reamer for the tenon cutter, or one maker's reamer for another's.** The Lost Art Press commenter correction (above); match the included angle, not the brand.

## Correct use

**Genuinely good at:** producing a clean, precisely sized round tenon on the end of a stick or spindle, repeatably, for chairmaking and similar round-tenon work, with the exact variant matched to the joint. A lathe or drawknife can do it too, more slowly or with more skill-dependent precision.

**Start from the joint, then the variant.** Decide cylindrical vs. true tapered tenon, the shoulder profile, the diameter and length, and the mortise diameter or reamer angle it must fit. Then choose a cutter whose geometry, capacity, drive and instructions support that joint, and read that cutter's manual before the first cut.

**Hand-operated wooden cutters (Bizzarri-style).** Bizzarri holds both the tenon cutter and the part in his hands for the cut, feeling a vise makes the tenon more likely to be askew; that is his practitioner technique for his own hand cutters. Adjust the blade with the tool secured and with small taps, test on a stick, and keep fingers off the blade edge and out of the cutter mouth. Follow the maker's instructions for any other hand cutter.

**Brace-driven hollow augers.** Keep the brace's axis rigorously in line with the stock's axis (Schwabacher's hip-braced top handle; LaRue's parallel-rod jig). Stop when the tenon reaches the set length or the stop; do not keep turning past it. Vintage hollow augers of unknown rating are not to be power-driven on forum inference: identify the model and follow maker documentation, or keep to a conservative hand-powered setup checked by a competent user.

**Drill-driven cutters (Veritas Power and Mini, and any other powered cutter).**
- Use the exact model manual; it wins over this entry.
- **Clamp the stock** horizontally in a vise or an equivalent stable fixture before driving the cutter `[manual, relayed]`. **Never hand-hold the workpiece for a powered cutter.**
- Use an electric **hand** drill with the specified chuck, low speed and high torque. Veritas Power Tenon Cutters: 500–700 rpm for the 5/8"–1" cutters, 100–200 rpm for the 1-1/4"–2" cutters `[manual, relayed]`.
- **Not for a drill press.** The Mini product page says "For use in an electric drill, not a drill press" (read); the Power cutter instructions say the same `[manual, relayed]`. A rigid drill-press setup can misalign and overload the cutter and break the shank `[manual, relayed]`.
- Keep stock within the rated maximum diameter `[manual, relayed]`, prepared and started square or chamfered as the manual directs `[manual, relayed]`.
- Hold the drill steady and in line with the stock's axis; feed under control.
- **Stop immediately** if there is vibration, binding, overheating or irregular cutting, and find the cause before continuing. Excess speed or overload can overheat the blade, ruining the edge and its hardness `[manual, relayed]`.
- For a tapered joint, the reamer must match the tenon's included angle and size system. A cylindrical tenon needs no reamer, only a bore sized to the tenon.

## Matching (the workbench's first read)

- **Does:** shapes a tenon on the end of a stick, dowel blank or spindle by rotating a bladed housing around it: cylindrical, cylindrical with a sloping or radiused shoulder, or truly tapered, by model. Some models also make continuous dowel, but only where the maker supports that model, blade and feed.
- **Suits:** Windsor and ladder-back chairs, stools, and leg/spindle/stretcher joinery built on a round tenon whose geometry the chosen cutter makes; rustic/twig furniture (US6,004,082's stated driver); wheel and spoke work and related handle work when the exact variant is documented.
- **Kit-fit — pairs with:** a reamer whose included angle and size system match the tenon (for tapered joints); a shave horse and drawknife/spokeshave for rough-tapering stock; for drill-driven cutters, a vise or stable fixture plus the drill, chuck and speed the manual specifies; for hand cutters, a brace or the maker's hand method.
- **Substitutes for:** a lathe, for repeated round tenons specifically; a freehand drawknife/spokeshave tenon.
- **Cannot substitute for:** general lathe turning (no swells, no non-tenon shaping); a dowel plate or full-length dowel cutter on models that do not support continuous dowel; a mortise reamer (which shapes the mortise, not the tenon).
- **Not-for (project-keyed):** square-shouldered tenons from a cutter that only makes a sloping or radiused shoulder (Michael Peet's 2012 Sawmill Creek thread exists because of this); full-length dowels on unsupported models; a tapered mortise fit with a cutter that makes a cylindrical tenon; drill-press use on prohibited models; hand-held stock with any powered cutter; any reamer angle that does not match the tenon; one-off single tenons where Bizzarri's test-stick fitting ritual is not worth it.
- **Children and classrooms:** not a general match. The one documented case is Liberman's hand-powered tap-handle fixture; match a classroom only to that fixture, under direct qualified supervision, with powered variants excluded.
- **Access:** a beginner can produce a usable tenon early, but the most consistent failure across sources is an off-axis or off-center tenon from a wandering brace or drill axis. That is an accuracy problem and, on powered cutters, a mechanical-failure hazard: misalignment and movement create high side loads that can break the cutter shank `[manual, relayed]`.
- **Revival:** a living tool in current chairmaking practice; Bizzarri, Schwarz, Galbert and Glenn are working or teaching chairmakers, and Lee Valley's 1999–2000 patents cite a "resurgence of interest in rustic furniture."
- **Confidence for matching:** MEDIUM. Match the variant, not the family name.

## Anatomy

- **Cutting housing.** A cylindrical barrel or body (metal in the American hollow-auger tradition and modern Veritas cutters; wood in the witchet tradition and some modern bodies) with a blade set to shave the rotating stock down to the bore diameter.
- **Blade/knife.** Bonney 1870: one adjustable knife set by three screws. Deming 1872: L-shaped bits on eccentric grooves. Veritas Power Tenon Cutter: a curved blade on the same radius as the shoulder it cuts. Veritas Mini: a straight blade cutting a 60° shoulder. Veritas Dowel and Tenon Cutters: a curved adjustable carbon-steel blade, with an optional straight blade for tapered tenons. All are sharp, exposed edges during handling and adjustment.
- **Adjustment mechanism.** Graduated stepped holes (Bonney) vs. continuous eccentric adjustment (Deming) vs. adjustable taper setting (Stearns 1877) vs. fixed-size bodies with a blade set by screw (modern Veritas, Bizzarri) vs. no adjustment (the witchet).
- **Drive interface.** A brace shank (19th-century forms); a shank for an electric hand drill or brace (Veritas Power); electric hand drill only, not a drill press (Veritas Mini); a hand-crank tap-handle-and-chuck rig (Liberman's fixture).
- **Depth stop.** Bonney's patent includes a stop piece for tenon length; of vintage examples, "Make sure the one you get has a depth stop - they seem to get lost fairly regularly" (Gary Herrmann, Sawmill Creek, 2012).
- **Bell-mouth/funnel throat.** US6,004,082 describes a bell mouth matching the blade's curve; US6,099,211 forms "a sloping shoulder corresponding to the funnel shape of the mouth."

## Variations (living)

| Variant | Output geometry / shoulder | Drive | Work holding | Prohibited or unsupported | Source |
|---|---|---|---|---|---|
| [[Witchet (Rounding Plane)|Witchet]] / rounding plane (shop-made, wood body) | Fixed single diameter; exact output varies by tool | Hand | Per tool | Not documented here | [[Dowel Maker]] [D6][D7] |
| Hollow auger, Bonney pattern (1870) | Cylindrical tenon, 8 stepped sizes, length stop | Brace | Not stated in sources read | Power drill: rejected by two named LumberJocks repliers | US105,896; The Valley Woodworker |
| Hollow auger, Deming pattern (1872) | Cylindrical tenon, continuous adjustment | Brace | Not stated | Power drill: as above | US133,570 |
| Hollow auger, Stearns taper pattern (1877) | Straight **and tapering** tenons, adjustable | Brace (period tool) | Not stated | Power drill: as above | US191,817, read directly |
| Spoke-pointer + hollow auger (wheelwright pair) | Pointer tapers the stock end; auger cuts the tenon | Brace | Not stated | — | US220,442 |
| Veritas Power Tenon Cutter | Cylindrical tenon, radiused shoulder | Electric hand drill (low speed, high torque) or brace | Stock clamped horizontally in a vise or stable fixture `[manual, relayed]` | Not for drill press `[manual, relayed]`; stock over rated diameter `[manual, relayed]` | US6,004,082, read; instructions relayed |
| Veritas Mini Tenon Cutter | Cylindrical tenon, 60° shoulder; 1/4"–9/16"; tenons to 1" (1/4–3/8") or 1 3/8" (7/16–9/16) | Electric hand drill | Stock clamped `[manual, relayed]` | "not a drill press" | US6,099,211 and product page, read |
| Veritas Tapered Tenon Cutter (hand) | True taper along the tenon's length | Hand | Per its instructions `[manual, relayed]` | Power-feed dowel-making (heat) `[manual, relayed]` | the reviewer's source notes; not read |
| Veritas Dowel and Tenon Cutters | Tenon on a turning, or dowel by power feed; 3/8", 7/16", 1/2"; tapered tenon only with the optional straight blade | Hand drill for dowel feed (per product page) | Not stated on the page | Use only the mode and blade the maker supports | Product page, read |
| Ray Iles chairmaking "rounders" | Rounding planes, Sheffield O1 carbon steel; confirmed not a distinct "tenon cutter" line | Hand | Not stated | — | workshopheaven.com |
| Ashem Crafts rotary planes (Rounding Plane, Trapping Plane, Hollow Shoulder Tool, Stail Engine, End Rounder) | "Genuine Fred Lambert rounders" design; company announced closure June 2022 | Hand | Not stated | — | ashemcrafts.com |

## Trades (where it appears)

**Chairmaking (Windsor and ladder-back) is the dominant living home**: Bizzarri, Schwarz, Galbert, Glenn and Alexander all work in it. **Wheelwrighting is the documented historical co-trade**, from patent text (US133,570, US220,442, US481,469 and others). **Lutherie** shares a prior-art field: Wittner GmbH's violin peg-cutter / peg-reamer patents cite the 1879 Stearns spoke-pointer patent. **Green woodworking and besom/broom-handle making** is the witchet form's historical home, per [[Dowel Maker]], not re-developed here.

## Lineage

- **Earliest patent located in the sources checked: 1859.** US23,381, "Adjustable Hollow Auger," Charles Meyer, Fond du Lac, WI, carried from a DATAMP listing; the patent itself was not read. A hobbyist restorer (The Valley Woodworker blog) claims "at least 85 different variations patented between the appearance of the first one in 1829 and the last American patent in Dec 1911"; held at MEDIUM, sourced only to that blog and not checked against a patent-class count.
- **Patents read in full text in Run 533.**
  - **US105,896, "Improvement in Hollow Auger,"** Charles S. Bonney, Syracuse, NY, Aug. 2, 1870; reissued as **RE7,689** (May 22, 1877) per DATAMP, which notes marked examples stamped "BONNEY'S/PAT.AUG/2.70." Mechanism: a slotted metal barrel with a brace shank, a revolving disc with graduated holes for different tenon sizes, an adjustable knife set by three screws, and a stop piece for tenon length. The Valley Woodworker restorer identifies his own as "the C.S. Bonney pattern," 8 graduated holes, 3/8"–1".
  - **US133,570, "Improvement in Hollow Augers,"** John Deming, Salem, Ohio (assignor of one-half to A.R. Silver), Dec. 3, 1872: "for producing tenons on the ends of spokes and other objects," so spoke tenons and other end tenons were served by the same patented mechanism. Mechanism: a hollow stem, V-groove periphery, four radial depressions, an adjustable cap with three cone-pointed screws, and L-shaped bits on eccentric grooves for continuous diameter adjustment. **Gap:** a dealer listing (Jim Bode Tools) names a "DOLE Patent October 31, 1865, SILVER & DEMING, Salem, Ohio, Hollow Auger"; no patent number was found.
- **A taper-cutting hollow auger, read directly in this pass.** **US191,817, "Improvement in Hollow Augers,"** George N. Stearns, Syracuse, NY, June 12, 1877: the tool can be "readily adjusted... to cut tapering tenons of different sizes," it "is more expressly designed for cutting tapering tenons," and the inventor writes "I denominate it an auger for cutting straight and tapering tenons." So at least one patented 19th-century hollow auger cut true tapered tenons.
- **The wheelwright cross-trade, from patent text.** **US220,442, "Improvement in [[Spoke-Pointer|Spoke-Pointers]],"** Edward C. Stearns, Syracuse, NY, Oct. 7, 1879: "designed for trimming down or pointing the outer ends of wagon or other spokes preparatory to forming tenons by means of a hollow auger," comparing its funnel cutting action to "the well-known pencil-sharpener." This documents a two-tool wheelwright sequence (point the spoke, then cut the tenon). (The [[Spoke-Pointer]] entry, Run 614, follows this patent's forward citations.) Further titles in the same class, verified via Google Patents in Run 533 but not read: US481,469 "Spoke-Tenon Cutter" (1892), US59,420 "Machines for Tenoning Spokes," US218,721 "Spoke-Tenon Augers," US896,579 "Wheelwright's Machine" (1908). The Valley Woodworker (2017): "Such hollow augers were very popular at one time mid 1800s to early 1900 since they were crucial for the wheelwright... used by chairmakers, ladder maker[s] and yes some cabinet makers." **Harry Strasil** (Sawmill Creek): "spoke pointers and tenoners (hollow augers) don't do tapers except the pointer makes a taper so the tenoner will start where you want it to." That holds for the cylindrical models he describes; it is not a universal rule, since US191,817 is a taper-cutting hollow auger. What separates the tools is which surface each cuts: the pointer tapers the stock end ahead of the cutter, the reamer shapes the mortise, the hollow auger or tenon cutter forms the tenon.
- **The modern patents' prior-art field.** US6,004,082 and US6,099,211 were read in Run 533 with their citation lists. US6,004,082 lists 65 cited references, each marked on Google Patents as cited by examiner (rechecked this pass), running by number from US15,530 (1856, "Manufacturing chairs") through US220,442 (1879, Stearns' spoke-pointer), US481,469 (1892), US690,339 (1901, "Hollow auger," Albert A. Wood) and US896,579 (1908). That list shows a broad field of earlier chair, spoke, dowel and tenon-forming patents treated as relevant prior art. It does not show that each cited tool developed into the next, and it is not a line of descent.
- **Branching into lutherie.** US220,442 is also cited as prior art by six later Lee Valley design patents and by Wittner GmbH's violin peg-cutter / peg-hole-reamer patents (US2007/0214938, US7,569,760; 2007/2009). Violin pegs are tapered friction-fit parts; the citation shows a shared prior-art field, not demonstrated transmission.
- **Why the modern commercial tool exists, in its own patent text.** US6,004,082's background names the Stanley No. 77 dowel-making machine (see [[Dowel Maker]]) as prior art: its blades are "difficult to sharpen because... their shape is complex," the tool "large, unwieldy and expensive," and it is "difficult or impossible to adjust by small amounts the diameter of the tenon produced," which matters because "fiber spring-back may cause tenons formed in green wood to be oversize." The patent frames itself as answering "a recent resurgence of interest in rustic furniture."
- **Museum survival.** Smithsonian NMAH, accession **1982.0426.04**, "Hollow Auger," maker **E.C. Stearns & Co.**, nickel-plated metal, 17.6 cm, classified under Auger; Carpenter/Joiner/Cabinetmaker; Woodworking; Rotary & Screw-Based Tools; Hand Tools (fetched in Run 533; the page was not reachable in this pass). It proves a surviving E.C. Stearns object and the period name. E.C. Stearns also patented the 1879 spoke-pointer, and the 1877 taper-cutting hollow auger came from George N. Stearns of the same city; the connection between the two Stearns names was not established.

## History (Petroski "form follows failure" lens)

- **Fixed size vs. adjustability.** A shop-made witchet cuts one diameter, fixed at construction. Bonney's 1870 graduated disc, Deming's 1872 continuous adjustment and Stearns's 1877 adjustable taper-cutter all let one tool serve many tenon sizes, the same "one tool, many sizes" answer [[Hole Saw]] documents for its arbor system. The wooden and metal forms are related answers to that problem; transmission from one to the other was not shown.
- **The modern tool's stated failure was cost and sharpening, not mechanism.** Per US6,004,082's background (above), the redesign kept the principle and changed the blade to a curved one that is easier to sharpen, at a retail price.
- **A live in-trade disagreement about why tapered joints are used, reported rather than resolved.** [[Dowel Maker]] carries a folk-engineering claim (a Vintage Tool Patch blog post): "a tapered tenon becomes tighter over time if force is applied against it, and has little chance of pushing through mortise over time like a round tenon will." Elia Bizzarri, on his technique site: "one oft-mentioned advantage of tapered joints does not hold water. I don't agree that tapered joints get tighter from the weight of the sitter. Our goal should be to make a joint that will not fail, because it is tight to begin with." Christopher Schwarz (Lost Art Press) made cylindrical tenons exclusively for years and adopted reamed tapered joints because reaming is forgiving of a mis-bored mortise angle, correcting a 10° boring error a fixed cylindrical hole cannot absorb ("I've done it"). Haft reports all three positions as unresolved.

## Human Side

*Named practitioners below are quoted from their own published pages and posts as gathered in Run 533. This entry is AI-compiled corpus material, not a craftsperson's testimony.*

- **Elia Bizzarri** (handtoolwoodworking.com) on his **wooden hand-operated chairmaking cutters**: "I hold both the tenon cutter and the part in my hands, since I feel that putting the tenon cutter or part in a vise increases the likelihood the tenon will be askew." He does use a vise for blade adjustment on the leg and arm-stump cutters, "clamping the tool in a vise and tapping a screwdriver gently into the back of the blade"; on the spindle cutters, "If you go too far, loosen the screw, pull the blade back and try again"; on the screw, "The screw can take a solid tightening, but excessive torque can pull the screw insert from the body." On shoulder cleanup: "A spokeshave is more dangerous — it is difficult to tell when you are cutting the tenon itself." His page does not discuss power drills (read directly this pass); his technique is for his hand cutters, not for powered ones. He sells a matched kit (leg tenon cutter, arm-stump tenon cutter, ½" spindle tenon cutter, a 6° reamer, a ⅜" dowel plate) for $560, and credits the reamer design to **Richard Starr** and blade-making instructions to **Jennie Alexander**.
- **Christopher Schwarz** (Lost Art Press, five posts 2020–2024): made cylindrical tenons from about 2003, "fast... when done properly, the joint is strong," later adopted reamed tapered joints. In 2024: "a lot of chairmakers – even experienced ones – struggle with the tool when using it freehand. Sometimes it makes perfect tenons. Sometimes the tenons are ragged. Or off-center." To a reader asking about an antique E.C. Stearns hollow auger: "They work. But not great. The Veritas tenon cutter is a huge improvement." On another product: "Don't buy the Lumberjack tenon cutters. Just don't." (the Lumberjack Tools Commercial Series 2" Tenon Cutter, model TAC2000, also turned up for resale on eBay).
- **Off-label history, not endorsed.** Schwarz has also described using an ordinary plug cutter handheld in a brace or drill, with pre-tapered stock, in place of a Veritas cutter, while noting "Most plug cutters warn you to use the tool only in a drill press." This is recorded only as something a named practitioner wrote about. It is an off-label setup with no manufacturer authorization, speed range or guarding behind it, and Hewn does not use it for matching, substitution or instruction. See [[Plug Cutter]].
- **Peter Galbert** (Chair Notes, 2010) built a shop-made "tenon shoulderer," a spokeshave blade set in a hardwood block that cuts only the tenon's shoulder to a 30° layout angle. A commenter (Andrew Jack) reported a steeper initial taper increased tearout; Galbert engaged on the fix.
- **Andy Glenn** (North Bennet Street School; trained under Dan Faia, Curtis Buchanan and Peter Galbert), cutting a wavy-grain spindle: the drawknife "catches it... a length in front of the blade lifts and rips away"; "I'm testing for failure... I also want it to fail here on the shave horse rather than once it is in the chair." He also set his tenon cutter too tight on a batch and cleaned up with a flat-bottom spokeshave.
- **Jennie Alexander** (writing as John Alexander until 2010; *Make a Chair from a Tree*) is named by a 2016 LumberJocks poster as recommending the hollow auger for ladder-back chair tenons.
- **Vintage hollow augers in a power drill.** In a 2016 LumberJocks thread, **Smitty_Cabinetshop**: "I would suggest it is not suited to use with an electric drill as it's not likely to be balanced at higher RPMs. The hollow auger, even more so." **RS Woodworks**: "Don't try putting it in a power drill tho. A hand brace is the way to go."
- **The most-repeated failure: off-axis, off-center tenons.** Sawmill Creek, 2017: Jim Belair's test tenons on spruce came out "a bit crooked" even after pre-squaring. **Alan Schwabacher**: "The tricky part of using a hollow auger is getting the tenon to be aligned... it's important to keep the brace precisely aligned. Make sure the top handle is in line with the axis of the brace... hold the brace top handle against your hip at that height." **Jim Koepke** agreed; **Darrell LaRue** proposed a parallel-rod alignment jig; Belair reported the fix worked. The same failure recurs in Schwarz's 2023/2024 posts and in the Popular Woodworking piece below.
- **A hand-powered fixture for a supervised setting.** Yoav Liberman, Popular Woodworking (Nov 2025): a tap handle, keyless chuck and square-tang drill-chuck adapter to turn a Veritas tenon cutter without an electric drill — "if you teach children, or if you simply prefer a quiet, controlled, and precise process, the electric drill is not always your friendly helper." This documents one fixture; it does not make the family suitable for children.
- **What the injury search found.** No first-person, named injury account was located for this family on Sawmill Creek, LumberJocks, Lost Art Press or general web search. That is a research result, not a safety finding: the hazards below come from the mechanism and the manufacturers' own warnings.

## Proof of existence

- **A dated, named-maker museum accession.** Smithsonian NMAH, accession **1982.0426.04**, "Hollow Auger," maker **E.C. Stearns & Co.**, nickel-plated metal, 17.6 cm (americanhistory.si.edu/collections/object/nmah_678693; fetched in Run 533, not reachable in this pass).
- **Patents read directly in full text**, 1870–2000: US105,896 (Bonney, 1870, reissued RE7,689/1877), US133,570 (Deming, 1872), US220,442 (Stearns spoke-pointer, 1879), US6,004,082 (Ruhlmann & Aziz/Lee Valley, 1999), US6,099,211 (Lee & Aziz/Lee Valley, 2000), all in Run 533; plus US191,817 (George N. Stearns, 1877), read in this pass. US23,381 (Meyer, 1859) is known only from DATAMP.
- **A prior-art field, not a lineage.** US6,004,082's 65 examiner-cited references run from 1856 to 1908 and beyond; they show what the examiner treated as relevant, not a chain of descent.
- **Independent physical confirmation**: The Valley Woodworker blog documents owning and using a Bonney-pattern example, marked "BONNEY'S/PAT.AUG/2.70."
- **Honest gaps.**
  - **Mercer** (*Ancient Carpenters' Tools*, 1929) and **Salaman** (*Dictionary of Woodworking Tools*): located on Internet Archive, not opened in primary form.
  - **No museum accession found** for Winterthur, the Mercer Museum or the Wycombe chair museum; searched by general web query only.
  - **The 1865 Silver & Deming patent** could not be located.
  - **The "85 patents, 1829–1911" claim** rests on one blog.
  - **The 1859 Meyer patent** was not read directly.
  - **Veritas Power Tenon Cutter and Tapered Tenon Cutter instructions** were not reachable from this machine in the fix pass; their content here is relayed from the review.
  - **Ray Iles and Ashem Crafts company histories** were not found (Ashem Crafts did confirm its 2022 closure and designer, Fred Lambert).
  - **James Mursell's use of the Veritas cutter**, carried at MEDIUM in [[Dowel Maker]], was not confirmed.
  - **No SAPFM, Woodnet or r/chairmaking source** was located.

## References

| Title | Author/Source | URL | Kind | Notes |
|---|---|---|---|---|
| "Dowel Maker" | this corpus, [[Dowel Maker]] | — | corpus cross-reference | names this tool as deferred future work |
| "Hole Saw" | this corpus, [[Hole Saw]] | — | corpus cross-reference | names the hollow-auger "cousin" relationship |
| "Improvement in Hollow Auger," US105,896 | Charles S. Bonney, 1870 | patents.google.com/patent/US105896 | patent, primary, direct (Run 533) | reissued RE7,689/1877; DATAMP cross-check |
| "Improvement in Hollow Augers," US133,570 | John Deming (½ to A.R. Silver), 1872 | patents.google.com/patent/US133570 | patent, primary, direct (Run 533) | "spokes and other objects" |
| "Improvement in Hollow Augers," US191,817 | George N. Stearns, 1877 | https://patents.google.com/patent/US191817A/en | patent, primary, direct (fix pass 2026-10-16) | adjustable auger for straight and tapering tenons |
| "Improvement in Spoke-Pointers," US220,442 | Edward C. Stearns, 1879 | patents.google.com/patent/US220442 | patent, primary, direct (Run 533) | wheelwright cross-trade |
| "Tenon Cutter," US6,004,082 | Paul V. Ruhlmann & Abdul Aziz, assignee Lee Valley Tools, 1999 | https://patents.google.com/patent/US6004082A/en | patent, primary, direct (Run 533; rechecked 2026-10-16) | cylindrical tenon, radiused shoulder; brace or electric drill; 65 examiner-cited references (a prior-art field) |
| "Miniature Tenon Cutter," US6,099,211 | Leonard G. Lee & Abdul Aziz, assignee Lee Valley Tools, 2000 | https://patents.justia.com/patent/6099211 | patent, primary, direct (Run 533; rechecked 2026-10-16) | cylindrical tenon with sloping shoulder; electric drill; not a tapered-tenon tool |
| Veritas Mini Tenon Cutters (product page) | Lee Valley | https://www.leevalley.com/en-gb/shop/tools/hand-tools/dowel-and-tenon-cutters/44248-veritas-mini-tenon-cutters | manufacturer, direct (fix pass) | 60° shoulder; 1/4"–9/16"; tenon lengths; "not a drill press" |
| Veritas Dowel and Tenon Cutters (product page) | Lee Valley | https://www.leevalley.com/en-us/shop/tools/hand-tools/dowel-and-tenon-cutters/52401-veritas-dowel-and-tenon-cutters | manufacturer, direct (fix pass) | tenon and power-feed dowel modes; optional straight blade for tapers |
| Veritas Power Tenon Cutters instructions | Lee Valley | https://assets.leevalley.com/Original/10091/42299-veritas-power-tenon-cutters-c-01-e.pdf | manufacturer manual, relayed from the reviewer (not reachable) | clamping, capacity, speeds, no drill press, shank failure |
| Veritas Tapered Tenon Cutter care and use | Lee Valley | https://assets.leevalley.com/Original/10117/05J6109-veritas-tapered-tenon-cutter-care-and-use-0001.pdf | manufacturer manual, relayed from the reviewer (not reachable) | true taper; sharp-blade warning; no power-feed dowel (heat) |
| "Adjustable Hollow Auger," US23,381 | Charles Meyer, 1859 | DATAMP | patent, secondary listing, not read | earliest located in the sources checked |
| "Hollow Auger," accession 1982.0426.04 | Smithsonian NMAH | https://www.americanhistory.si.edu/it/collections/object/nmah_678693 | museum, primary (fetched Run 533) | E.C. Stearns & Co. object and period name |
| "The Hollow Auger" | The Valley Woodworker blog, 2017 | thevalleywoodworker.blogspot.com | named hobbyist restorer | Bonney-pattern example; 85-patent claim (unverified) |
| "Using Chairmaking Tenon Cutters" | Elia Bizzarri | https://handtoolwoodworking.com/using-tenon-cutters/ | named practitioner, direct (rechecked 2026-10-16) | hand-cutter technique only; no power-drill content |
| "Tenon Cutters" | Elia Bizzarri | https://handtoolwoodworking.com/tenon-cutters/ | named practitioner, per the reviewer (not read this pass) | separate cylindrical spindle and tapered leg/arm cutters; matched 6° tools |
| "6 vs 11 degree tapers" | Elia Bizzarri | handtoolwoodworking.com/6-vs-11-degree-tapers | named practitioner | dissent from "tightens under load" |
| "Reamers" (product page) | Elia Bizzarri | handtoolwoodworking.com/reamers | named practitioner | kit pricing/sizing |
| "Reason Enough to Ream" | Christopher Schwarz, Lost Art Press, 2020 | blog.lostartpress.com | named practitioner | error-tolerance rationale |
| "Tenon Cutter Tips" | Christopher Schwarz, Lost Art Press, 2023 | blog.lostartpress.com | named practitioner | off-center trap; E.C. Stearns vs Veritas |
| "Tips on Tapered Reamers" | Christopher Schwarz, Lost Art Press, 2022 | blog.lostartpress.com | named practitioner | overreaming warning |
| "Chairmaking on the Cheap(er), Part 1" | Christopher Schwarz, Lost Art Press, 2022 | blog.lostartpress.com | named practitioner | Lumberjack warning; off-label plug-cutter history; reamer-naming correction |
| "Controlling the Damn Tenon Cutter" | Christopher Schwarz, Substack, 2024 | christopherschwarz.substack.com | named practitioner (partial, paywalled) | off-axis struggle |
| "Making a Tenon Shoulderer" | Peter Galbert, Chair Notes, 2010 | chairnotes.blogspot.com | named practitioner | shoulderer build |
| "Making Cherry Spindles" | Andy Glenn | andydglenn.substack.com | named practitioner | wavy-grain test; too-tight cutter |
| "Hollow auger use help" | Jim Belair et al., Sawmill Creek, 2017 | sawmillcreek.org | forum, named posters | off-axis thread |
| "Teach me about spoke pointers and hollow augers" | Dave Matson, Harry Strasil et al., Sawmill Creek, 2010 | sawmillcreek.org | forum, named posters | Strasil's cylindrical-model statement |
| "Tenon Maker Plans" | Bob Glenn, Sawmill Creek, 2018 | sawmillcreek.org | forum, named poster | one user's dowel-through claim |
| "Cutting a round tenon in the end of a dowel" | Michael Peet et al., Sawmill Creek, 2012 | sawmillcreek.org | forum, named posters | square-shoulder boundary |
| "Hollow Augers? Anyone Used One?" | TheWoodenOyster, Smitty_Cabinetshop, RS Woodworks, LumberJocks, 2016 | lumberjocks.com | forum, named posters | vintage auger in power drill |
| "The Hand-Powered Tenon Cutter" | Yoav Liberman, Popular Woodworking, 2025 | popularwoodworking.com | trade press, named author | one supervised hand-powered fixture |
| Ray Iles product page | workshopheaven.com | workshopheaven.com/ray-iles | retailer | rounders; no "tenon cutter" line |
| Ashem Crafts site | ashemcrafts.com | ashemcrafts.com | manufacturer | Fred Lambert design; 2022 closure |

## The reviewer's corrections (13)

- `BLOCKER` — 1. Correct the Veritas Mini Tenon Cutter's geometry and patent lineage — Exact claim: “Lee Valley/Veritas sells two distinct current product lines, both patented by the same company: a cylindrical (‘Power Tenon Cutter,’ US6,004,082) and a tapered/miniature form … (US6,099,211).”
- `BLOCKER` — 2. Do not apply a hand-cutter holding technique to powered cutters — Exact claim: “Hold both tool and workpiece in the hands rather than clamping either in a vise,” followed by matching that pairs the family with “a brace or cordless drill for power.”
- `BLOCKER` — 3. Add the manufacturer's powered-cutter operating envelope — Exact claim: The entry recommends a cordless drill but supplies no cutter-specific speed, chuck, torque, capacity, drill-press, or work-holding limits.
- `BLOCKER` — 4. Replace the “not an injury risk” conclusion — Exact claim: Off-axis or off-center cutting is “a real, teachable, correctable beginner trap … not an injury risk.”
- `BLOCKER` — 5. Add complete blade, adjustment, torque, and entanglement controls — Exact claim: The dangerous section is “genuinely thin” and largely limits risk to possible vintage-tool imbalance at drill speed.
- `BLOCKER` — 6. Correct the claim that hollow augers only cut straight cylinders — Exact claim: “The hollow auger itself only ever cuts a straight cylinder; any taper in the finished joint comes from the reamer … or the pointer/drawknife.”
- `BLOCKER` — 7. Replace the “unbroken, examiner-verified citation chain” claim — Exact claim: US6,004,082's reference list creates “an unbroken, examiner-verified citation chain from an 1850s tool patent to a currently-sold commercial product.”
- `BLOCKER` — 8. Remove or quarantine the handheld plug-cutter substitution — Exact claim: A drill-press-rated plug cutter used handheld is presented as a “self-aware improvisation” and a useful contrast case.
- `BLOCKER` — 9. Qualify children's/classroom matching — Exact claim: The tool “suits … classroom and children's woodworking, hand-powered, per the tap-handle adaptation.”
- `SHOULD-FIX` — 10. Separate dowel-making from tenon-making by model and blade — Exact claim: “A tapered cutter run to full depth also produces a plain round dowel,” and the entry treats dowel and tenon cutters as mechanically overlapping by default.
- `SHOULD-FIX` — 11. Correct the Smithsonian interpretation — Exact claim: Smithsonian's “Auger” object classification “institutionaliz[es] the same naming collision.”
- `SHOULD-FIX` — 12. Tighten the historical and revival claims — Exact claim: The 1859 Meyer patent is the “earliest identified patent”; the adjustable hollow auger descended from a fixed wooden witchet; and factory hollow augers had “gone out of catalogs by 1940.”
- `SHOULD-FIX` — 13. Fix matching and confidence, then remove process residue — Exact claim: One combined entry assigns MEDIUM-HIGH confidence while mixing hand tapered cutters, hollow augers, drill-powered cylindrical cutters, dowel cutters, and rounders; it also preserves extensive run, research passes, and queue narration.