Ratchet feed arm, pawl pivot at 30 mm, Ø5 hub — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/ratchet-feed-arm-30/  (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 77.0, width 14.0, height 5.0
- Lever that swings on the ratchet wheel's Ø5 shaft and carries the feed pawl on a Ø3 pin 30 mm out, with a 40 mm handle beyond: rocking it to and fro steps the Ø40, 24-tooth ratchet one or more teeth per stroke.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
hub  Ø14, Ø5 bore
pawl pivot  Ø3 at 30 mm
handle  40 × 10 mm
thickness  5 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. 225: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_225.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/ratchet-feed-lever-mechanism/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/ratchet-feed-arm-30/index.json
API: https://xemstudio.com/api/geometry?object=ratchet-feed-arm-30