Gears and transmission
Spin-Only Bar Lathe with Roller Rests and Marking Ledge
- Bounding box
- 384.0 × 113.0 × 94.0 mm
- Engine
- Precision B-rep
- Parameters
- 19
- Published
- November 8, 2026
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The prompt
Simple spin-only 3D-printed bar lathe for marking: one 24 mm DC motor drives a 608-bearing spindle through a 2:1 gear stage; a 3-screw chuck clamps round bar up to 8 mm; a tailstock with an M8 threaded-rod centre supports the far end for up to 200 mm of bar; two sliding roller rests (pairs of 608 bearings in a V) keep the bar level and true along its length; a long marking ledge with a 10 mm scale sits beside the bar so you can mark it and then take it to an external saw
Parameters
| Name | Value | Range |
|---|---|---|
| Bar diameter this chuck and the roller rests are cut for (reprint for other sizes) | 8 mm | 3 – 8 |
| Supported bar length drawn (chuck face to tailstock centre, up to 200) | 200 mm | 50 – 200 |
| Spindle axis height above the base | 56 mm | 46 – 70 |
| First roller rest, distance from the chuck face (it slides) | 65 mm | 20 – 190 |
| Second roller rest, distance from the chuck face (it slides) | 135 mm | 20 – 190 |
| Ledge top below the bar axis | 8 mm | 4 – 14 |
| Gear module | 1 mm | 0.8 – 1.5 |
| Motor pinion teeth | 15 | 14 – 20 |
| Spindle gear teeth | 30 | 24 – 45 |
| Gear face width | 6 mm | 5 – 10 |
| Added centre distance (backlash) | 0.2 mm | 0.1 – 0.5 |
| Motor body diameter | 24 mm | 20 – 30 |
| Motor body length | 12.5 mm | 10 – 25 |
| Motor shaft length | 9.7 mm | 8 – 14 |
| Motor pocket clearance (snug) | 0.15 mm | 0 – 0.5 |
| 608 pocket clearance (diametral) | 0.2 mm | 0.05 – 0.4 |
| Bore clearance on 8 mm rod parts | 0.2 mm | 0.1 – 0.4 |
| Hole for M3 heat-set insert | 4.2 mm | 3.8 – 4.6 |
| M3 clearance hole | 3.5 mm | 3.2 – 3.8 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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