Wiper insert
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A wiper insert is a insert used in a milling machine or a lathe. It is designed for finish cutting, to give a smooth surface on the surface being cut. It uses special geometry to give a good finish on the workpiece at a higher-than-normal feedrate. Wiper inserts generally have a lot of area in contact with the workpiece, so they exert a lot of force on the workpiece. This makes them unsuitable for fragile workpieces.