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Feed pawl for the 24-tooth Ø40 ratchet (pivot 30 mm from the wheel axis)

What shape is a ratchet feed pawl? · Modern device · basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance

Also called: feed pawl, ratchet pawl, click, trinquete (uña de avance), Schaltklinke

Exact dimensions. True size, with no printing tolerance added.

length
18.39 mm
width
8.0 mm
height
6.0 mm

Notes

  • 6 mm pawl with a Ø8 boss on a Ø3 pivot and a narrow nose whose end face is cut to lie on the steep face of a 3 mm ratchet tooth over 80 % of its depth (2.4 mm): it drives the wheel through face contact, not a point. Pivot to nose 14.39 mm; designed for a pivot 30 mm from the wheel's axis.
  • The same face-contact pawl design as the ratchet-wheel pawls (pawl-24t-d40), drawn here for a feed lever's pivot.
  • Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

Feed pawl for the 24-tooth Ø40 ratchet size chart

dimensionvalue
pivot holeØ3, Ø8 boss
pivot to nose14.39 mm
nose face2.4 mm, on the tooth's steep face
thickness6 mm

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.orgwebPublisher's page; dimensions are facts
507movements.comBrown's movement No. 225: figure, his text and an animationwebPublisher's page; dimensions are facts
Xem StudiodrawingwebPublisher's page; dimensions are facts

Free files

★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

ratchet-feed-pawl-24t-d40pawl, pivot at origin, nose on +X, z 0..6STEP · STL
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Plain text: sheet.txt · JSON: /api/geometry?object=ratchet-feed-pawl-24t-d40

Feed pawl for the 24-tooth Ø40 ratchet (pivot 30 mm from the wheel axis), isometric render of a generated part
Render of ratchet-feed-pawl-24t-d40 from the free STEP; not to scale.

Fits with

Ratchet wheel stepped by a swinging pawl lever, isometric render of a generated part
Ratchet wheel stepped by a swinging pawl lever3 sizes★ 1 file

Questions

What shape is a ratchet feed pawl?

6 mm pawl with a Ø8 boss on a Ø3 pivot and a narrow nose whose end face is cut to lie on the steep face of a 3 mm ratchet tooth over 80 % of its depth (2.4 mm): it drives the wheel through face contact, not a point. Pivot to nose 14.39 mm; designed for a pivot 30 mm from the wheel's axis.