What are crossing and oval files?

29th February 2020


	What are crossing and oval files?


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			Crossing and oval files are two different types of machinist’s file that are used for shaping concave surfaces.

			What are the characteristics of crossing and oval files?
			Cross section Crossing files have two rounded faces, one shallower than the other. This makes for a cross section that resembles a pointed oval.

			As the curves on both sides of a crossing file are slightly different shapes, it can file concave surfaces of different depths.

			Crossing files really come into their own in the watch making industry, though. Their shape means they are suited to creating and finishing curved surfaces and circles of different sizes.

			Their pointed edges allow them to shape inside tight areas in watch hands and gears. This process, known as ‘crossing out’, is where the file earned its name.

			The cross section of an oval file is not pointed at the edges, and follows a more conventional oval shape.

			As well as filing with their wide, convex faces, oval files can be used edge-on to file inside steep concave grooves.

			Profile Both types of file are tapered in width and thickness to allow them to file in tight spaces.

			Cut They are both double cut on all faces.

			Size Crossing files are usually available in lengths from 100mm (4 inches) to 200mm (8 inches).

			Oval files are usually 137mm (5¹/₂ inches) to 197mm (7³/₄ inches) long.

			Swiss or American? Crossing files and oval files are both Swiss pattern files.