Broaching an internal keyway on a CNC lathe with an inserted keyway cutter that uses TiN coated carbide inserts. The material is Aluminum, the depth of cut per pass is .0015″ (DOC) the speed is 450 IPM inches per minute on a Daewoo Lynx lathe. Lathe Broaching offers many benefits by removing a 2nd opertation and allowing your part to come off of the cnc machine complete. A common concern is that the forces are to much and damage your machine but this is not correct. At .0015″ DOC there is barely enough force to register on an indicator. Blind Keyway Broaching is also possible with an appropriate relief groove of cross hole relief. Broaching an internal blind keyway on a cnc lathe is a significant money-saver.
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