Edge-runner (chaser) mill: two rollers on one axle rolling round a pan — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/edge-runner-mill-mechanism/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown No. 375 (1868)
Catalog version: 2026-10-20

Sizes: see table below
- Two heavy wheels on a horizontal axle that passes through a vertical spindle: turning the spindle drags the wheels round the pan, and because a wheel's inner edge travels a shorter circle than its outer edge the rim both rolls and skids — it crushes by weight and grinds by the skid.
- Drawn with Ø50 × 16 runners at 50 mm radius on a Ø5 × 150 axle, Ø12 spindle, Ø160 pan; each runner touches the pan floor along a line (contact only).
- Brown's No. 375 (chasers, edge runners, for crushing and mixing); mortar, pigment and gunpowder mills.
- Parts (each has its own page): edge-runner-pan-d160, edge-runner-d50x16-b5, edge-runner-spindle-d12x100, linear-shafts-h6.
- Brown's movement No. 375 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

parameter  value
runners  2 × Ø50 × 16
track radius  50 mm
pan  Ø160
spindle  Ø12 × 100

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. 375: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_375.html

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