Xem Studiomeasured geometry

Library › Mechanisms › Screws ·

Screw (fly) press: Tr16×4 screw in a C-frame nut

How does a screw press work? · Hardware · basis: Xem Studio design following Brown No. 105 (1868)

Also called: screw press, fly press, stamping press screw, hand screw press, prensa de husillo, Spindelpresse

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

sizes
4 in table

Notes

  • A coarse screw turns in a fixed nut at the top of a C-frame; its end comes down on the work. One turn = one lead (4 mm); the bar through the head gives the leverage: ideal force gain 2π × 40 / 4 ≈ 63, and in a fly press the weighted bar's momentum adds a blow.
  • The catalog Tr16×4 jack screw is reused (basic ISO 2904 profile, drawn engaged in the frame's nut with no allowance); the frame is a Xem Studio design following Brown's figure. Drawn with the screw tip 10 mm above the foot.
  • Brown's No. 105 (screw stamping press: rectilinear motion from circular).
  • Parts (each has its own page): screw-jack-screw-tr16x4, screw-press-c-frame-tr16x4, tommy-bar-6x80.
  • Brown's movement No. 105 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

Screw (fly) press: Tr16×4 screw in a C-frame nut size chart

parametervalue
threadTr16×4
travel per turn4 mm
lever80 mm bar
ideal gain≈ 63

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. 105: 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

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

Screw (fly) press: Tr16×4 screw in a C-frame nut, isometric render of a generated part
Render of screw-press-mechanism-assembly from the free STEP; not to scale.

Fits with

Screw-jack screw Tr16×4, 90 mm thread, Ø28 head with tommy-bar holes, isometric render of a generated part
Screw-jack screw Tr16×4, 90 mm thread, Ø28 head with tommy-bar holes28.0×28.0×106.0 mm★ 1 file
Screw-press C-frame with a Tr16×4 nut boss, 70 × 60 foot, isometric render of a generated part
Screw-press C-frame with a Tr16×4 nut boss, 70 × 60 foot70.0×60.0×110.0 mm★ 1 file
Tommy bar Ø6 × 80, isometric render of a generated part
Tommy bar Ø6 × 8080.0×6.0×6.0 mm★ 1 file

Questions

How does a screw press work?

A coarse screw turns in a fixed nut at the top of a C-frame; its end comes down on the work. One turn = one lead (4 mm); the bar through the head gives the leverage: ideal force gain 2π × 40 / 4 ≈ 63, and in a fly press the weighted bar's momentum adds a blow.