WHEEL TRAIN

The wheels of the going train

- Must be chamfered above and below.
- In wheels 0.15 mm thick or less, a single chamfer is allowed.
- They must have polished sinks.
- For wheel plates 0.15 mm thick or less, a single sink is allowed.
- The shape and position of the sink are at the discretion of the applicant provided the sink is polished.
- The crossing, hub and rim of the wheels must be chamfered.
- The functional parts of the pivot-shanks and pivots, including their faces must be burnished.
- The other parts must be finished so as to eliminate all machining traces.
- The pinion faces must be finished so as to remove all machining traces, without rounding off their edges and/or flattening out burrs. Polishing, grinding or any other finishing operations are acceptable provided they do not contravene the foregoing requirements.
- The pinion leaves must be polished without modifying the functional part of their tips.

Wheels and gears that are not in the going train

- Must be finished so as to remove all machining traces.
- Teeth must be polished if the material used allows it.
- Wheels with crossings must be finished in the same way as the going-train wheels.
- The ratchet-wheel and the crown-wheel must be decorated so as to remove all machining traces and must have chamfered and polished teeth.