turning mandrels from rebar

alinwa said:
...... in fact, in this case I've even got a relief cut into the mandrel such that I'm turning and trimming to length in one setup.
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Well the relief cut idea was a total ballsup!! I went down to videotape the process for an upcoming episode of my 50BMG series and she din't go so veryvery well :) I couldn't efficiently get rid of the inner burr and pulling back off the mandrel became problematic so I turn't off the camera, rebuilt the setup and I'm trimming-to-length in a separate operation.
 
geo.ulrich said:
Ceramic works fine or grind if you have that availability and you don't need to use the crappy free machining steels which are to soft for any real use....
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Thank you.

The "ceramic" you are talking about is better than carbon like diamond or cubical boron nitride coating ? Never heard neither read about monobloc ceramic cutting bits or even ceramic coating of tungsten carbide holser/support ...
 
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