Weight-Driven Seconds Pendulum Clock Movement v1

A two-plate clock movement (120 × 160 × 3 mm plates, four 50 mm pillars) with a module 0.8 going train (96/8, 64/8, 60/8), a 30-tooth escape wheel turning once a minute, a Graham deadbeat anchor spanning 7.5 teeth, and a crutch driving a 994 mm seconds pendulum. Front motion works (12/36 × 10/40) give the 12:1 hour-hand reduction.

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Flagged by the engineer

• With one module for all motion works, the 12/36 pair (a=19.2) and the 10/40 pair (a=20.0) cannot share a centre distance. The hour pair is therefore set to m=0.768; a profile shift or different tooth counts would avoid this.
• 8-leaf involute pinions undercut heavily. Real clocks use cycloidal leaves, so the involute form here is an approximation.
• The anchor sits close to the plate top. Check pallet depthing on assembly.
• The pendulum needs a rating nut for fine adjustment, which is not modelled.

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Specification

Standard parts · purchasable

Parts list