Xem Studiomeasured geometryLibrary › Mechanisms › Screws & feeds ·
Feed rack for a face spiral, module 1, 6 teeth, 19.05 × 8 × 7, curved teeth
What rack runs on a face spiral? · Modern device · basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
Also called: feed rack, scroll rack, curved tooth rack, cremallera de avance para espiral frontal, Vorschubzahnstange für Spiralscheibe
Exact dimensions. True size, with no printing tolerance added.
- length
- 19.05 mm
- width
- 7.0 mm
- height
- 8.0 mm
Notes
- 6-tooth rack of module 1 (pitch 3.14 mm), 19.05 mm long, 8 wide, teeth 2.25 mm deep (tip at +1, root at -1.25 from the pitch line), body 6 mm below the pitch line. Generated by the spiral rib: in each of seven planes across the width the rib's section was swept past the rack and the envelope taken, so the teeth are straight-flanked (20°) but curved along the rack's width, following the spiral's curvature (the tooth at the edges of the face sits about 0.3 mm farther along than at the middle). The rack ends in the middle of a space at both ends.
- Slides radially over the disc's face, its teeth pointing at the face; one turn of the disc moves it one pitch.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).
Feed rack for a face spiral, module 1, 6 teeth, 19.05 × 8 × 7… size chart
| dimension | value |
|---|---|
| module | 1 |
| teeth | 6 |
| length | 19.05 mm |
| width | 8 mm |
| tooth depth | 2.25 mm |
| body | 6 mm below the pitch line |
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. 99: 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
| face-spiral-feed-rack-m1-6t-w8 | rack along X (x -9.62..9.42), teeth pointing +Y, pitch line y = 0, width z -4..4 | STEP · STL |
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=face-spiral-feed-rack-m1-6t-w8
Fits with
Questions
What rack runs on a face spiral?
6-tooth rack of module 1 (pitch 3.14 mm), 19.05 mm long, 8 wide, teeth 2.25 mm deep (tip at +1, root at -1.25 from the pitch line), body 6 mm below the pitch line. Generated by the spiral rib: in each of seven planes across the width the rib's section was swept past the rack and the envelope taken, so the teeth are straight-flanked (20°) but curved along the rack's width, following the spiral's curvature (the tooth at the edges of the face sits about 0.3 mm farther along than at the middle). The rack ends in the middle of a space at both ends.