Planet carrier for three planets on a 21 mm radius (Ø52 × 5) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/planet-carrier-3x-r21/  (CC BY 4.0)
Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
Catalog version: 2026-10-20

Overall (mm): length 52.0, width 52.0, height 5.0
- Ø52 × 5 plate with a Ø8 centre bore (turns on the sun's Ø8 shaft) and three Ø5 holes 120° apart on a 21 mm radius for the planet axles (Ø5 dowels): carries 18-tooth planets around a 24-tooth sun inside a 60-tooth ring at module 1.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
plate  Ø52 × 5 mm
centre bore  Ø8
planet holes  3 × Ø5 on R21

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. 502: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_502.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/epicyclic-gear-train-mechanism/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/planet-carrier-3x-r21/index.json
API: https://xemstudio.com/api/geometry?object=planet-carrier-3x-r21