Gallery, Projects and General > How do I??

Tapping a lot of holes

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bogstandard:
I have admired that tapping tool ever since you have shown it John.

I will have to get in touch with my mate and see if they are throwing any out.


John

John Stevenson:
Knowing what I know know I should have bought one years ago.
I was in the process of getting the bits to build one out of a reversible tapping head when I found that you could just get the air heads.

For a home shop I reckon a decent geared DC motor with a tapping head grafted on would be better than the one I have in that you wouldn't have to run a compressor. I think Frank Ford was looking at using one of the cheap butterfly wrench's to drive a tap adaptor but they wouldn't have a clutch.

Quite a few possibilities.

JS

Brass_Machine:
I am tapping (50 or more) 9.5mm 6061 aluminum plates. Each plate has 12 holes to be tapped to 8 1.25 threads. Square pattern about 13mm apart.

Eric

usn ret:
Eric,  were it me drilling and tapping that many holes I would set up the mill to drill established dial settings and a vise stop for repeatability.  The tapping, I would use a battery powered drill with the plates ridigidly supported to prevent tap breakage and maintain s degree of quality.  Again lots of quality tapping lubrcant. For power drill tapping a 2 flute is strunger than a 4 flute tap. :dremel:
Cliff :beer:

Bernd:
At a 8-1.25" thread I don't think you need to worry about tap breakage. I'd worry more about the drill motor and tap taking my arm for a spin.

Eric, I was thinking a jig with pins located at the proper location. Drill and tap hole, turn part repeat, do four times. Remove pin drill - tap turn four times. That would work if the holes are evenly spaced all the way around.

BTW, that is an 8 threads per 1.25" is it not? or did one off us interpid that wrong.

Bernd

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