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Constant-diameter cam for two Ø10 rollers 44 mm apart, 4 thick, Ø8 bore
What is a constant-diameter cam? · Modern device · basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
Also called: constant diameter cam, conjugate cam, yoke cam, cam between rollers, leva de diámetro constante, Gleichdickkurve (Kurvenscheibe zwischen Rollen)
Exact dimensions. True size, with no printing tolerance added.
- length
- 34.42 mm
- width
- 34.0 mm
- height
- 4.0 mm
Notes
- Plate cam whose roller-centre (pitch) curve is r = 22 + 6 sin θ − sin 3θ: opposite radii always add up to 44 mm, so two rollers 44 mm apart on one yoke touch it at every angle and the yoke is driven both ways with no spring. The profile is the pitch curve offset inward by the 5 mm roller radius (no undercut). Stroke 14 mm.
- Only odd harmonics are allowed in such a curve (r(θ) + r(θ + 180°) = constant); the sin 3θ term flattens the ends of the motion.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).
Constant-diameter cam for two Ø10 rollers 44 mm apart, 4 thick, Ø8… size chart
| dimension | value |
|---|---|
| pitch curve | r = 22 + 6 sin θ − sin 3θ |
| roller centres | 44 mm apart |
| rollers | Ø10 (623 bearings) |
| stroke | 14 mm |
| thickness | 4 mm |
| bore | Ø8 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Henry T. Brown (1868, public domain) | Five Hundred and Seven Mechanical Movements — scan on archive.org | web | Publisher's page; dimensions are facts |
| 507movements.com | Brown's movement No. 117: figure, his text and an animation | web | Publisher's page; dimensions are facts |
| Xem Studio | drawing | web | Publisher's page; dimensions are facts |
Free files
★ Free files 1 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json
https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=constant-diameter-cam-c22-a6-b1-bore8
Fits with
Questions
What is a constant-diameter cam?
Plate cam whose roller-centre (pitch) curve is r = 22 + 6 sin θ − sin 3θ: opposite radii always add up to 44 mm, so two rollers 44 mm apart on one yoke touch it at every angle and the yoke is driven both ways with no spring. The profile is the pitch curve offset inward by the 5 mm roller radius (no undercut). Stroke 14 mm.