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.