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Double rack frame, module 1, racks 20 mm apart (120 × 44)

What is a double rack frame? · Modern device · basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance

Also called: double rack, rack frame, reciprocating rack, bastidor de doble cremallera, Doppelzahnstangenrahmen

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

length
120.0 mm
width
44.0 mm
height
8.0 mm

Notes

  • 120 × 44 × 8 frame with two facing module 1 racks whose pitch lines are 20 mm apart (one pitch diameter of a 20-tooth pinion), teeth in phase; a half-toothed pinion between them drives the frame one way on the upper rack and back on the lower.
  • Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

Double rack frame, module 1, racks 20 mm apart size chart

dimensionvalue
frame120 × 44 × 8 mm
racksmodule 1, 96 mm, pitch lines 20 mm apart
end holes2 × Ø3 for guide rods/pins

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. 114: 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

double-rack-frame-120frame, pitch lines y = ±10STEP · STL
Let your AI pull this. Add 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.
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Plain text: sheet.txt · JSON: /api/geometry?object=double-rack-frame-120

Double rack frame, module 1, racks 20 mm apart (120 × 44), isometric render of a generated part
Render of double-rack-frame-120 from the free STEP; not to scale.

Fits with

Mutilated pinion and double rack (continuous rotation to reciprocation), isometric render of a generated part
Mutilated pinion and double rack (continuous rotation to reciprocation)3 sizes★ 1 file

Questions

What is a double rack frame?

120 × 44 × 8 frame with two facing module 1 racks whose pitch lines are 20 mm apart (one pitch diameter of a 20-tooth pinion), teeth in phase; a half-toothed pinion between them drives the frame one way on the upper rack and back on the lower.