Posted by NCWayne on November 12, 2013 at 10:20:27 from (173.188.169.54):
In Reply to: Re: making piston pins posted by gene bender on November 12, 2013 at 06:11:37:
What I was meaning is that after being hardened they can"t be machined and have to be ground to the final, true size. Granted I know they can be machined before hardening, but afterwards they are too hard for anything but grinding. I had one years ago I wanted to use for a spacer, and needed one end a few thousands smaller than it was, and figured I could get at least that little bit off of it. How wrong I was. I tried a carbide insert and it laughed at it, I tried a ceramic insert and it laughed at it. Short of grinding there was no way that pin was going to get any smaller. I wound up getting a piece of regular 4140 to make the piece I needed and threw the pin in the scrap bin.
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