A friend just gave me a large lathe chuck and I need help identifing it. It is 18" in diameter, 4 jaw independant, with an additional 4 slots like a face plate would have. I measured the chuck thread, it has
6 tpi. The diameter of the thread taken by measuring the smallist diameter on the female chuck thread (I mean I measured from peak to peak not valley to valley) was about 2 9/16". Is this a standard thread, if so what is it.
I have a copy of Machinery's Handbook but there is so much info that I can't seem to find what I am looking for.
This chuck will not fit my lathe, a 7" x 18" atlas. Is it time for ebay?
Thanks Paul G