Originally posted by Bob Engelhardt
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Multiple different size threaded hole in the same part with one tool i.e. a 32 pitch tool can cut a 6-32, 8-32, and 10-32 threaded hole in a part all with one tool. Of course single point tools can cut more than one pitch.
Chip control with a lot of tapped holes can be easier to control. I always watch taps like a hawk when running longer cycles with a lot of holes, sometimes you get chips wound up that can cause a broken tap if not paying attention.
Difficult or hardened materials is easier to threadmill than tap.
The downside is it might take a couple holes to really dial in a threadmill process and get it perfect. Good taps are much more fool proof, and unless you are doing a whole bunch of oddball sizes, in huge quantities, a good quality tap of the proper type for what you are tapping will suit you just fine.
Then there's form taps....
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