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Gear racks: module 1 (100 mm) and module 2 (150 mm)
Where can I get a 3D printable gear rack? · Hardware · basis: Involute rack, 20° pressure angle, module 1 and 2, matching the spur gears here
Long Earth Society build part. Linear drive with the shelf gears. The engines
Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features
- sizes
- 2 in table
Notes
- Straight toothed bars that mesh with the module 1 and module 2 spur gears to turn rotation into straight-line travel.
- One turn of a z-tooth pinion moves the rack π × module × z: 62.8 mm for a 20-tooth module 1 gear.
- Module 1: 100 mm long, 8 × 8, three Ø3.4 mounting holes. Module 2: 150 mm long, 12 high × 10 wide.
Sizes
| module | length | section | travel per turn, 20 T pinion |
|---|---|---|---|
| 1 | 100 mm | 8 × 8 | 62.8 mm |
| 2 | 150 mm | 12 × 10 | 125.7 mm |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| mounting holes | Ø3.4 | M3 screw clearance | designed | rack-m* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Rack and pinion | web | CC BY-SA 4.0 (text) |
| Long Earth Society | Engine and rig builds on extrusion frames | web, video | LES site |
Free files
★ Free files 2 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| rack-m1-100 | rack, module 1, 100 mm, 8 high × 8 wide, three Ø3.4 mounting holes; meshes with the module 1 spur gears | STEP · STL |
| rack-m2-150 | rack, module 2, 150 mm, 12 high × 10 wide; meshes with the module 2 spur gears | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=gear-racks
How it fits
Goes in or on
Aluminium T-slot extrusionrack bolted along a frameConnects to
Spur gears, involute 20°module 1 / 2 pinionAlternatives
T8 lead screw and brass nutscrew drive instead of rackYou might also need
Questions
Which gear meshes with these racks?
Any 20° module 1 or module 2 spur gear; the spur gear page has matching ones.
How far does the rack move per turn?
Π × module × teeth: 62.8 mm for a 20-tooth module 1 pinion.