Finish cuts will generate surfaces near 32 microinches, and roughing will be near 500 microinches.Ĭutting fluid is commonly used to cool the drill bit, increase tool life, increase speeds and feeds, increase the surface finish, and aid in ejecting chips. Surface finish produced by drilling may range from 32 to 500 microinches. Constraining the position of the drill bit using a drill jig with drill bushings.Spot facing, which is machining a certain area on a casting or forging to establish an accurately located face on an otherwise rough surface.
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