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Watchmaking: A. Lange & Söhne finishing techniques

August 3, 2011

Black polish - the most sophisticated and challenging finishing technique - is performed exclusively on the tourbillon bridge and cage. It can take up to five days to polish one single part.

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The Glashütte ribbing emulates a gently rippled effect. The pattern decorates the three-quarter plate and some other large parts of the framework.

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Chamfering: At Lange, every single bevel on almost all parts is polished by hand, at an angle of exactly 45 degrees. Sharp inner corners are particularly challenging.

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The mirror-smooth surface of the flat polish is achieved by rubbing the part in a figure-eight motion on special foils coated with diamond dust.

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Contour grinding: The contours of all framework components are given a matt finish to create a vivid interplay with the polished edges.

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Circular graining is used on round shapes such as wheels. Unlike most other finishes, this one is applied by rotating the part around the tool.

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The perlage consists of small, overlapping circles, achieved with a rotating grinding tip. In A. Lange & Söhne watches, it is mainly used for bridges and plates.

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Linear finish: The fine lines in a parallel direction are achieved by sliding apart in one direction over a piece of abrasive paper.

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The engraving turns each A. Lange & Söhne timepiece into a unique and personal belonging: Every balance cock is hand engraved with lavish floral elements by one of six master engravers.

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The sunray finish is mainly used on bigger wheels and parts of the framework. The graining results in a spiral pattern.

A. Lange & Söhne, Horology


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