Mushroom (curved-face) cam follower, R25 face, 8 mm stem — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/mushroom-follower-r25/  (CC BY 4.0)
Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
Catalog version: 2026-10-20

Overall (mm): length 32.5, width 59.0, height 6.0
- Follower whose 36 mm wide face is an arc of 25 mm radius on an 8 × 6 mm stem: the curved face tolerates misalignment and wears more evenly than a flat one; the cam is the pitch curve offset by 25 mm.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
face radius  25 mm
face width  36 mm
stem  8 × 6 mm

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Henry T. Brown (1868, public domain): Five Hundred and Seven Mechanical Movements — scan on archive.org — web — Publisher's page; dimensions are facts — https://archive.org/details/fivehundredseven00browiala
- 507movements.com: Brown's movement No. 138: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_138.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/plate-cam-mushroom-follower-mechanism/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/mushroom-follower-r25/index.json
API: https://xemstudio.com/api/geometry?object=mushroom-follower-r25