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Horological Meandering

Affolter Pignons

 

A leader in the manufacture of pinions, wheels and other gear-train components for almost a century, Affolter Pignons sells millions of components every year to clients in the watch industry.

The first step in the production of any part is profile-turning, the stage where pinions are cut from steel bars. They are then precision-cut using machines equipped with automatic loaders specially designed by the group. After the hobbing process, the pinions are quenched and tempered, a process which changes the structure of the material. They are then ready for burnishing, which gives them the necessary hardness to ensure correct operation of the watch movement. Between each operation, batches of parts are washed. This serves not only to improve the visual appearance of the components, but also removes residues of shavings and lubricant.

Burnishing gives the pinion its final dimensions and considerably improves its surface finish. The last stage in the process is assembly. Most gear-trains contain a brass wheel mounted on a steel pinion. The operation to assemble these two elements is called riveting.

Finally, the component is inspected. Carried out during production, it ends a process in which 100% of production is verified for high-end components, while a sampling method is used for the firm’s mid-range products.

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