Kenneth Lerman wrote: > Jon, > > I've tried to use combination drill/taps with my Tapmatic tapping head with > similar breaking results. The problem seems to be that the tapping head > allows for sideways float to that the tap will self align with an existing > hole. That works great when you are manually positioning a part on a drill > press. It did not work well with the drill/tap on the same drill press. > > For now, I just drill all the holes and then make a separate pass with a > tap. Well, I do batches of servo amp mounting plates with 12 holes/plate, all 4-40. When I get everything all set up right, I can do the whole batch on one tap, and sometimes a tap works for several batches over time before something goes wrong. I usually break the tap on the first hole or two. Yes, I think the radial slop in the tap holder is the problem. I want to try doing this on my minimill (which has a spindle encoder) and without the huge Procunier tapping head in the stack, the tap will be just an inch or two below the spindle. That should let the tap go in straight and without wander.
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