Pantograph linkage (2:1 copier) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/pantograph-linkage/  (CC BY 4.0)
Basis: Xem Studio drawing; classic mechanism (Brown No. 246)
Catalog version: 2026-10-20

Sizes: see table below
- Four bars pinned as a parallelogram with the fixed pivot, tracer and pen on one straight line: pen travel = tracer travel × k (k = 2 here).
- Moving the pivots along the arms changes k; swapping tracer and pen reduces instead of enlarges. The line pivot–tracer–pen must stay straight for the copy to be true.
- Also used in scissor lifts, sewing-machine and engraving copiers.
- Parts (each has its own page): pantograph-arms-200-100, pins-3mm. Brown's movement No. 246 shows it (1868).

parameter  value
scale k  2 : 1
arms  200 / 100 mm
pins  Ø3

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

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/pantograph-linkage/index.json
API: https://xemstudio.com/api/geometry?object=pantograph-linkage