Cyclograph base plate 180 × 100 × 4 with two Ø3 pin holes 100 mm apart — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/cyclograph-base-plate-180x100-c100/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
Catalog version: 2026-10-20

Overall (mm): length 180.0, width 100.0, height 4.0
- 180 × 100 × 4 plate standing in for the drawing board, with two Ø3 holes 100 mm apart (the chord's ends) for the guide pins.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
plate  180 × 100 × 4 mm
pin holes  2 × Ø3, 100 mm apart

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. 403: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_403.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/cyclograph-arc-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/cyclograph-base-plate-180x100-c100/index.json
API: https://xemstudio.com/api/geometry?object=cyclograph-base-plate-180x100-c100