12-14-2014, 04:18 PM
Jack,
I'd use a GTN (neutral, square tip) insert and cut at perhaps 250 to 300 surface feet per minute. I can't calculate actual RPM without knowing the diameter of the tubing. You can use a GTL or GTR if the tubing is a DOM (drawn over mandrel) seamless, I recommend the stronger neutral edge if it's welded because that weld tends to wipe out inserts.
The most important thing with stainless is to maintain a feed rate of at least .003" per rev and do NOT let it dwell for even a nansecond because it'll "work harden" on you.
As for grades and chipbreakers, stainless like a fairly sharp edge and tight chipbreaker. I'm not familiar with "NPV", is that the maker, chipbreaker or grade given?
I'd use a GTN (neutral, square tip) insert and cut at perhaps 250 to 300 surface feet per minute. I can't calculate actual RPM without knowing the diameter of the tubing. You can use a GTL or GTR if the tubing is a DOM (drawn over mandrel) seamless, I recommend the stronger neutral edge if it's welded because that weld tends to wipe out inserts.
The most important thing with stainless is to maintain a feed rate of at least .003" per rev and do NOT let it dwell for even a nansecond because it'll "work harden" on you.
As for grades and chipbreakers, stainless like a fairly sharp edge and tight chipbreaker. I'm not familiar with "NPV", is that the maker, chipbreaker or grade given?