Originally Posted by mactec54  Kimykabibble
Your Nook Ballscrews XPR are only case hardened just as most ballscrews are, the only ballscrew that are through hardened are made from the stainless steel type materials like 17-4 PH etc, & do not have the same hardness as case hardened ballscrews, your XPR are 58-60 RC, the stainless steel screws are only 40-48RC & both are easy to machine with the right tooling.
Pntrbl
Yes ballscrew are normally case hardened RC58-62 even the best you can buy are only case hardened if they were RC60 all the way through there would be a lot of broken screws |
That was my understanding as well, but I can tell you those suckers are damned hard all the way through, may be not Rc60, but hard just the same. I cut a 1" screw down to 1/2", and was still having a hard time cutting with good carbide insert tools.
Regards,
Ray L.