Kirk Wallace wrote: > Is tapping obsolete? > > http://www.emuge.com/carbide_thread/ > Others have given good answers, but there is an alternative: SINGLE-row thread mills. These have the advantage that they will mill a range of thread pitches with one cutter, and they are cheaper than multi-row thread mills. They are also slower as you have to mill the entire length of the thread helix, while a multi-row thread mill can do a length of thread in one orbit of the hole. For a small shop, and in cases where you need to mill non-standard thread diameters or pitches, these are great. I have a 1/4" single-row thread mill from Micro-100, and have used it on some odd jobs. One was a 1" 20 TPI thread that needed to be milled at an angle to the rest of the part. I had no idea how to fixture it on the lathe so I mounted it on a sine bar in a milling vise and drilled and thread milled it with excellent results.
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