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Chamfering is a manual or mechanical operation of finishing that involves polishing the angle formed by the edge connecting two surfaces for aesthetic or technical purposes. Chamfering operations are made primarily for aesthetic reasons. Often, they are executed between the upper surface of a component and its flank. The inclination of the angle can vary depending on the desired aesthetic, the profile and dimensions of components, and any technical constraints. But the angle is generally balanced (45° for two surfaces forming a 90° angle in total).

Depending on the method used and the desired quality, the angle can be flat or convexly rounded and polished to a wide range of standards.

Bridges, mainplates, springs, yokes, gears, etc. Most components of a mechanical watch can be decorated with chamfering, as long as their functionality is not affected.

When chamfered, the polished angle reflects light in prisms and contrasts with the generally satin or matte surfaces it connects.