Re: [CAD_CAM_EDM_DRO] Re: Thread milling

Taps are ground in a helix. So, using a standard hand tap for a thread mill would not work very well. The commercially available cutters break easily and dull quickly. And going deep with a 60 degree thread mill is also a problem because the shanks are generally very short. Taps are the best way to go. A tapping head will make threads 1" deep in 2 seconds, thats in and out of the hole. Of course for large diameters and one not wanting to invest in seldomly used large taps, thread milling would be best. As far as programming a thread mill its just determine the diameter with tooling offset then program a circle and add a Z- in the string corresponding to the pitch lead. Just repeat circle and increase the Z- value consecutively.

Ron

Graham Stabler <eexgs@...> wrote:


Would it be possible to take a normal tap and grind away two of the
sets of teeth and then add some relief to the teeth remaining to
make cheap multi point thread mills for specific pitches? Perhaps
using a metal filled epoxy to fill the flutes and stiffen the
assembly.

Graham







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