The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →A compact homemade cutter can make functional gears by driving an M16 machine tap into a gear blank while the blank is free to rotate. A sliding bearing support and hand-turned threaded rod control the feed. Hackaday describes the method as useful for some brass and steel gears, but not as a precision gear-production system or a way to create highly complex tooth forms.
How the tap-driven cutter works
Maciej Nowak’s homemade machine, described by Hackaday on January 27, 2023, uses a small motor and belt-driven pulley to spin an M16 machine tap. The gear blank sits on a sliding linear-bearing support. Turning a threaded rod by hand advances the support and controls how deeply the tap engages the blank. As the tap cuts, the blank rotates on its bearing, forming tooth spaces around its circumference. Hackaday’s account of the machine identifies a machine tap rather than a hand tap; its smaller flutes are more suitable for this use.
What the feed mechanism does
The threaded rod is the operator’s means of setting engagement and depth, while the linear bearing guides the workpiece support as it advances. This is a manually controlled arrangement, not a CNC feed system. The article does not report accuracy, repeatability, load capacity, or cost comparisons, so it should be treated as a practical maker’s workaround rather than a measured production method.
What kinds of gears it can make
Hackaday says the machine can produce usable brass and steel gears for some purposes, while noting that it does not form highly complex tooth shapes needed for ultimate performance. The article also points to a possible use with M16 threads: gears made this way can work with them as worm gears. Those are qualitative claims about this build, not a guarantee of compatibility or performance for every gear design.
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- 8pcs gear cutters(No.1-8) + 22mm R8 Milling Cutter Holder Set.
- DP16 Gear Cutter Pressure angle is 14-1/2 degree, inner bore 22mm, outside diameter 55mm.
- Standard specifications 8pcs Involute Gear Milling cutters, made of high-speed steel, strong and durable.can cut gears with different number of teeth.
- R8 Mill Cutter Holder：Drawbar threaded :7/16". Fit for cutter / saw diameter;22mm.
- Straight Shank,hardened and ground throughout to assure maximum concentricity.
How this differs from other gear-cutting methods
“Gear cutting” covers processes with different tooling and motion. Helicron’s workshop overview describes cutting individual tooth spaces with indexing, hobbing with a specialized cutter and synchronized blank rotation, and gear shaping with a single-point cutter or specialized generating motion. The tap-driven machine is not automatically equivalent to a precision hobbing setup; the process and resulting tooth form depend on the tool and machine arrangement.
A separate Arduino-controlled plastic cutter
An Arduino Blog build uses a small circular blade and stepper-driven indexing of the blank. The October 13, 2022 article says it is mainly intended for nylon and other plastics, allows the user to set diameter and tooth count, and requires a different blade to change the tooth-cut profile. Its listed components include an Arduino Nano, Nextion touchscreen, two stepper motors, motor drivers, and a larger DC motor. These details belong to that separate design, not the M16 tap cutter. Arduino Blog’s description of its machine explains that approach.
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A historical tap-driven example
A Meccano design reproduced from a March 1972 Meccano Magazine article uses a 9/16-inch Whitworth tap in a rigid frame. Its scan describes examples using brass, aluminium, PVC, and nylon stock, and reports that the pictured build cut a 60-tooth nylon gear. That result belongs to the historical Meccano design, not to Nowak’s M16 machine. The scan attributes its reproduction to T. Edwards in April 2003. The scanned Meccano gear-cutter plan stresses that the frame should be square and rigid.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose a method by the job, not the label
The cited descriptions are not a controlled head-to-head performance or cost study. Use these qualitative distinctions to identify which process is worth investigating for a particular project:
Quick Recap
Rank #4
- BS-0 Dividing Head Set - Semi-universal dividing head setup for compatible milling machine indexing, gear tooth work, flute work, face work, slots, and bolt-hole circles.
- Direct and Indirect Indexing - 24 quick-dividing holes support 2, 3, 4, 6, 8, 12, and 24 divisions; A/B/C dividing plates support broader indirect indexing setups.
- 40:1 Worm Gear Ratio - Catalog specs list a 1:40 worm gear reduction ratio for controlled indexing movement during milling, drilling, boring, and layout operations.
- MT2 Center and 3.93 in Center Height - BS-0 catalog specs list MT2 center taper, B&S No. 7 taper reference, 18 mm spindle hole, 3.93 in center height, and 22 kg net weight.
- Set Components for Shop Setup - Seller draft lists 5 in 3-jaw chuck, MT2 tailstock, centers, driving dog, threaded back plate, and three dividing plates with the BS-0 dividing head.
Rank #3
- Made of Caste Iron, Precision High Quality 4" /100 mm Regular Rotary Table designed for smaller milling machines.
- Table is graduated 360 Degrees. Worm Gear Ratio -1:36, which means that the 1 handle rotation shall turn the table by 10 Degrees. Can be clamped vertically and horizontally both ways.
- Can be clamped vertically and horizontally both ways. Height when laid horizontally 2-5/16" Inches ( 58 mm ) . Center Height in vertical position: 2-1/8" (53.5 mm approx) .Hand wheel is graduated in divisions of 10 min & can be set to zero.
- Base Dimensions : 135 mm x 105 mm with 2 x U slots (9.5 mm) . Body is painted and Rest all working surfaces are precision ground. The Dial and locking screws are plated and Handle has epoxy black finish for a rust free life. Smooth Jerk free easy rotation with negligible play. The top of the table is ground to eliminate any excess run out.
- It is mainly used to cut gear teeth accurately and equal spacing of the teeth of the gear. Also used for milling gears, splines, squares, cutting of flutes in reamers, drills and milling cutters, racks, grinders, etc.
| Approach | What the cited source establishes | Useful decision questions |
|---|---|---|
| M16 tap-driven cutter | Hackaday describes a belt-driven machine tap cutting brass and steel gears for some purposes; the blank rotates as it is fed into the tap. | Will the resulting tooth form suit the mating parts? Is a functional one-off gear enough, or is a repeatable standardized component required? |
| Arduino blade-and-indexing cutter | Arduino Blog describes a stepper-indexed blank and circular blade, mainly for nylon and other plastics; changing the profile requires changing the blade. | Does the intended material and blade profile fit the part? Can the build provide the required indexing and tooth count? |
| Indexed tooth cutting, hobbing, or shaping | Helicron outlines these as distinct workshop processes, with different cutters and work motions. | Which process can produce the required tooth form, and what tooling and machine motions are available? |
| Meccano tap-driven design | The historical scan describes a 9/16-inch Whitworth tap and reports a 60-tooth nylon gear from its pictured build. | Does this particular plan’s tool, frame, and documented material example suit the project? |
What to verify before building or using the design
- Tooth form and mating part: establish whether the resulting profile and compatibility are suitable for the gear’s intended job; the Hackaday article warns against expecting highly complex tooth shapes.
- Tool choice: the featured build specifies an M16 machine tap. It does not identify a brand or exact SKU, so confirm the appropriate tap form and geometry for the setup rather than assuming any M16 tap is interchangeable.
- Material and outcome: Hackaday specifically mentions brass and steel as usable in some applications. Do not infer a broader material range or a performance guarantee from that description.
- Process requirements: consider whether the project needs manual feed, indexed cuts, synchronized hobbing, or shaping motion; those are different approaches, not interchangeable names for one machine.
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