03-17-2006, 10:55 AM
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 | Moderator | | Join Date: Mar 2003 Location: Canada
Posts: 4,825
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I'd use HSS steel and grind to a high positive rake, since chip flow is the typical priority when turning soft gummy materials. And, unless you are turning some 2" diameter solid round (or larger $$  $$), on a typical lathe you might have a hard time overspeeding, so just run it fast and feed it at such a rate as to give the required surface roughness.
A high positive rake tool may also curl the chips into a coil so you can find every last particle, as well 
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