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Lower fiddle block: pitch-Ø19 and pitch-Ø25 sheaves side by side

What is the lower fiddle block: pitch-ø19 and pitch-ø25 sheaves side by side? · Modern device · basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance

Also called: pulley block, tackle block, motón, Flasche (Rollenblock)

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

length
84.4 mm
width
13.0 mm
height
45.7 mm

Notes

  • Block frame: two 2 mm cheeks either side of the sheaves (Ø4 pin holes), joined by bridges that carry Ø3 stems (into the beam, the floor plate or a weight's socket) and Ø3 rope-end sockets; every bridge sits clear of the rope's path. The stem sits on the line of the four supporting strands' resultant (x = 1.5).
  • Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

Lower fiddle block: pitch-Ø19 and pitch-Ø25 sheaves side by side size chart

dimensionvalue
sheavespitch Ø19 at (-24.5, 0), pitch Ø25 at (27.5, 0)
cheeks2 mm, 9 mm apart (8 mm sheaves)
pinsØ4
stemsØ3 × 8 at x = 1.5 down

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. 12: figure, his text and an animationwebPublisher's page; dimensions are facts
Xem StudiodrawingwebPublisher'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

tackle-block-fiddle-lower-19-25frame, sheave plane y = 0, coordinates as in the mechanismSTEP · 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=tackle-block-fiddle-lower-19-25

Lower fiddle block: pitch-Ø19 and pitch-Ø25 sheaves side by side, isometric render of a generated part
Render of tackle-block-fiddle-lower-19-25 from the free STEP; not to scale.

Fits with

Blocks and tackle, two sheaves in each block (4 : 1), isometric render of a generated part
Blocks and tackle, two sheaves in each block (4 : 1)4 sizes★ 1 file

Questions

What is the lower fiddle block: pitch-ø19 and pitch-ø25 sheaves side by side?

Block frame: two 2 mm cheeks either side of the sheaves (Ø4 pin holes), joined by bridges that carry Ø3 stems (into the beam, the floor plate or a weight's socket) and Ø3 rope-end sockets; every bridge sits clear of the rope's path. The stem sits on the line of the four supporting strands' resultant (x = 1.5).