11/18/2023 0 Comments Form tap vs cut tap![]() You'll never get the busted piece out without destroyng the hole. Don't ever bottom a thread forming tap under power with a solid driver. ![]() I've been told that Major dia minus half the thread pitch is close enough but I like to run a few practice holes especially in tough material. For cut taps I think the more teeth cutting the better. Getting the tap drill just right can be a pain. In practice I havent noticed any problems just using bottoming form taps, I have noticed a difference with coated vs non-coated form taps. Longer Tap Life - Forming taps last 3 to 20 times longer than cutting taps because they have no cutting edge to dull. ![]() I cut tap on the lathe (radially) with rigid ER25 (standard collets), 3-4% coolant (semi-synthetic), 2800 metric M5 blind holes before I toss the tap. They said plug taps were recommended when possible over bottoming taps as it gives the metal more time to be formed. ![]()
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