Posted by DR. EVIL on November 25, 2020 at 08:56:44 from (174.192.134.238):
In Reply to: Re: Handy hint posted by flembo on November 24, 2020 at 10:58:07:
I wasn't running the lathe doing the tapping, but one bar out of 3 semi-trailer loads of 4" 4130 aircraft quality cold drawn steel bars broke a 2"-4-1/2 threads per in tap off, turned bar around, drilled and tapped other end and broke a second tap. The shop managed to break up the remains of the tap and got it threaded deep enough without breaking a 3rd tap. The other end they welded a plug in the hole and ground it smooth. Then the tapped around 150 more bars with that 3rd tap.
Hammer pins for automobile shredders, think of a hammermill feed grinder 8 ft wide by 7 feet in diameter. And we made bigger ones too. 8 ft diameter by 9 ft wide.
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