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Ingold's Fraise

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Ingold's Fraise

Ingold was a Swiss watchmaker who invented this tool in the 1850s to correct wheel tooth profiles and to finish wheels after cutting in the rounding-up tool or wheel engine.

An advantage of this tool is that the teeth are cut in the direction in which they will operate in the watch.

The rounding-up tool leaves fine grooves across the tooth faces. Ingold's fraise removes these marks and burnishes the tooth along the face, at the same time correcting the tooth shape.

The cutter must be chosen with care if it is to cut correctly.


I. The tool in its box with a full range of cutters. It is set up like a depthing tool.	II. A close-up of the cutter, or "fraise". Each tooth has fine ridges running lengthways to produce a fine cut. The cutter fits onto a tapered arbor with a pulley for the bow.

III. large and small cutters

IV. A cutter mounted on its arbor

V. The fraise in use. It can be rotated with a bow, or by hand.	VI. The fraise in use.

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