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Is there any other way to tap a hole other than the standard hole tap? Answered

Tags:tapping

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vince 09

10 years ago

ya just getting a tap that size is the easiest way, and you can do it by hand. we had to for the bell housing on the jeep, it wasn't fun tho lol

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jeff-o

10 years ago

It doesn't get much simpler than a hole tap. What is the material, and what size hole will eventually be drilled in it?

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screemrhed9jeff-o

Answer 10 years ago

its cast iron and its a 3/4 inch hole. i was looking around and there doesnt seem to be any taps that are strong/sharp/big enough to tap something like that.

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Fixerdadscreemrhed9

Answer 10 years ago

Check out McMaster-Carr, you can get the tap you need there. Tapping 3/4" cast iron shouldn't be too bad as long as you start with the correct size hole. I cut threads on pipe by hand, and have done up to 3" with out too much trouble. One note of caution, there are several types of "cast iron" . Engine blocks and waste pipe cut like butter, but there are some plumbing fittings, I believe called ductile iron, that are really tough and hard. They are also brittle, the theory being that once you put them on, that's it, until 30 or 40 years later when some poor shmoe has to come along and fix whatever broke. That's when two hammers are used to crack the fitting off since any attempt to unscrew it is suicidal. Hope this ramble helps.

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screemrhed9Fixerdad

Answer 10 years ago

it did actually help, since someone else mentioned McMaster-Carr when i was tlaking about it in engineering class the other day, so I'll have to check them out.

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jeff-oscreemrhed9

Answer 10 years ago

Hmmm, you might have to bring it to a machine shop. I suspect that a hole that large will require a machine to do the work - a regular hand-held tap won't cut it.