Glenn R. Edwards wrote: > > Other issues with thread milling: 1)The thread mill tool will not follow the > pre-drilled hole as will a tap. 2)Getting the correct pitch diameter from a > thread mill is a trial and error routine. I don't think so. I bought a single-row 1/4" thread mill from Micro-100. I wrote a program to create the G-code, and after trying one pass in air, I drilled a hole and let it run. It produced a thread as close as I could tell identical to a tap. I didn't have a real certified go/no-go gauge, but a threaded part felt the same in the hole. I was very impressed. I had bought the thing because I had a job coming up that needed an NSEF thread, and I was worried about getting a tap for that. Then a sale flier on special taps crossed my desk, and I was able to get the right tap at a very reasonable price. So, I've only done one job where I needed to thread an off-size hole at a wierd angle. But, it produces a thread with very predictable pitch diameter.
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