Xem Studiomeasured geometry

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Hand crank, pinion and toothed sector pressing through a connecting rod

How does a sector gear give a press its force? · Hardware · basis: Xem Studio design following Brown No. 133 (1868)

Also called: sector gear press, quadrant press, pinion and sector, prensa de sector dentado, Zahnsegmentpresse

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

sizes
5 in table

Notes

  • A hand lever turns a 20-tooth pinion meshing with a 60-tooth sector (3 : 1); an arm on the sector drives the platen down through a connecting rod and a guided block. Force at the platen ≈ 3 × (lever / arm) × hand force = 3 × 60/60 × F, rising as the rod comes into line with the guide.
  • Drawn with the sector turned 12°: the arm end at (12.47, -58.69), the platen block at y = -117.38 in a 6.2 mm slot (contact), the 60 mm catalog link as the rod.
  • Brown's No. 133 (press: crank, pinion, toothed sector and connecting rod to the platen).
  • Parts (each has its own page): sector-gear-m1-60t-90deg-arm-60-b5, spur-gears-module-1, hand-lever-60-bore6, four-bar-links, slide-block-12x6, slot-guide-plate-90, dowel-pins-metric.
  • Brown's movement No. 133 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

Hand crank, pinion and toothed sector pressing through a connecting… size chart

parametervalue
pinion / sector20 T / 60 T, module 1
centre distance40 mm
sector arm60 mm
rod60 mm
lever60 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. 133: figure, his text and an animationwebPublisher'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

sector-gear-press-mechanism-assemblyAssembled mechanism, all parts placed at one pose (STEP keeps each part separate)STEP · 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.
Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=sector-gear-press-mechanism

Hand crank, pinion and toothed sector pressing through a connecting rod, isometric render of a generated part
Render of sector-gear-press-mechanism-assembly from the free STEP; not to scale.

Fits with

90° toothed sector (module 1, 60 T) with a 60 mm arm and Ø3 pin hole, Ø5 bore, isometric render of a generated part
90° toothed sector (module 1, 60 T) with a 60 mm arm and Ø3 pin hole, Ø5 bore43.84×98.98×8.0 mm★ 1 file
Spur gears, module 1: 10 to 80 teeth (20° involute), isometric render of a generated part
Spur gears, module 1: 10 to 80 teeth (20° involute)26 sizes★ 26 files
Hand lever, 60 mm, Ø6 hub bore, isometric render of a generated part
Hand lever, 60 mm, Ø6 hub bore74.0×18.0×5.0 mm★ 1 file
Four-bar links: flat links with 20 to 100 mm hole centres, isometric render of a generated part
Four-bar links: flat links with 20 to 100 mm hole centres7 sizes★ 7 files
Slide block 12 × 6.2 mm for a 6.4 mm slot, isometric render of a generated part
Slide block 12 × 6.2 mm for a 6.4 mm slot2 sizes★ 1 file
Slot guide plate 90 × 30 × 5, 6.2 mm slot (74 long), isometric render of a generated part
Slot guide plate 90 × 30 × 5, 6.2 mm slot (74 long)90.0×30.0×5.0 mm★ 1 file
Dowel pins, 2–6 mm (ISO 2338 / DIN 6325), isometric render of a generated part
Dowel pins, 2–6 mm (ISO 2338 / DIN 6325)5 sizes★ 23 files

Questions

How does a sector gear give a press its force?

A hand lever turns a 20-tooth pinion meshing with a 60-tooth sector (3 : 1); an arm on the sector drives the platen down through a connecting rod and a guided block. Force at the platen ≈ 3 × (lever / arm) × hand force = 3 × 60/60 × F, rising as the rod comes into line with the guide.