Lathe Tools - 4: Knurling
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.

The knurling tool is not a cutting tool, but a tool that leaves a diamond impression in the work. It accomplishes this because there are either two or three tool steel quality "rollers" in a knurling tool. The tool steel means that the rollers are harder than the parts being machined. When the rollers engage the part and a very slow feed and RPM are used, the knurling tool produces a knurled finish on the part. This finish is actually pressed by the rollers of the knurling tool, and this pressure forms a diamond pattern. There should be care taken that all work is properly supported while knurling, as the extreme pressure will cause damage if the part should come loose. It is also possible to shatter the rollers of the knurling tool, and these flying objects could cause eye damage

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