Lead screw and nut-slide (rotation to straight travel), Tr10×2 — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/lead-screw-and-slide-mechanism/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown No. 103 (1868)
Catalog version: 2026-10-20

Sizes: see table below
- A screw held axially in two bearings turns; a nut that cannot turn (its foot runs in a rail slot) must then travel along the screw: 2 mm per turn for a Tr10×2 thread. Either direction of rotation gives the opposite travel.
- Travel per turn = lead; force gain (ideal) = 2π × lever radius / lead, 2π × 40 / 2 = 126 with the 80 mm tommy bar; the 30° trapezoidal thread is self-locking at this lead angle (3.6°).
- Brown's No. 103 (rectilinear motion of a slide by the rotation of a screw): the carriage feed of lathes, slides and stages. Basic-profile thread drawn engaged, no allowance.
- Parts (each has its own page): lead-screw-tr10x2-l80-journals-6, nut-slide-tr10x2-16x24-rail-foot, lead-screw-frame-120-tr10x2, tommy-bar-6x80.
- Brown's movement No. 103 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

parameter  value
thread  Tr10×2
travel per turn  2 mm
slide travel  ≈ 60 mm
lever  80 mm tommy bar

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Henry T. Brown (1868, public domain): Five Hundred and Seven Mechanical Movements — scan on archive.org — web — Publisher's page; dimensions are facts — https://archive.org/details/fivehundredseven00browiala
- 507movements.com: Brown's movement No. 103: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_103.html

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/lead-screw-and-slide-mechanism/index.json
API: https://xemstudio.com/api/geometry?object=lead-screw-and-slide-mechanism