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Large diameter tap.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...p_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net..._thick_tap.jpg
Previously:
https://www.homemadetools.net/forum/...200#post188222
https://www.homemadetools.net/forum/...094#post184319
https://www.homemadetools.net/forum/...792#post183184
https://www.homemadetools.net/forum/...812#post179068
https://www.homemadetools.net/forum/...002#post176037
You can bet he is not taping those holes with that tap but using it to clean up the threads.
We used to have a 50 Hp Cincinnati mill for taping 41/2" holes in 6" thick material. if that thing hung up for some reason the tap would grenade. the shrapnel would dent the 1/8" thick steel safety shroud around it
Agreed, just chasing the existing threads. No one is pulling such a tap with a peg-legged [one handled] wrench.Quote:
Originally Posted by Altair
More of a wonder is stack of adapters in use; kicking up size of 3/4" drive to socket engaging the tap. I count 3 of them.
The 12 pt socket to fit the square drive of that tap would have a 1 1/2" sq drive then the 1 1/2"to 1" adapter then a 1" to 3/4" adapter driven by a 3/4" ratchet with a pipe cheaterQuote:
Originally Posted by Toolmaker51
A tap that size costs upwards of a couple grand even a 3 1/2 12 TPI plug tap will set you back $1300.00. If it were in my shop and I needed to chase some machined threads with a pat that size there would be a homemade tool posting for a proper 6ft long tap handle by the time I got through