Roy Underhill shows how to use an 1889 foot-driven metal working lathe. Make your own darn metal screws with this 1889 foot-powered lathe! Roy shows how to cut perfect threads, cones and tapers in ...
Tapping screws form mating threads in materials they are driven into. There are two basic types: thread forming and thread cutting. The thread-forming screw displaced material around the pilot hole so ...
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