Threading 316L
Hi all, I was hoping to hear your opinion on a threading issue we have here...
We are cutting external 3/4"-14 NGT threads into 316L from bar stock.
The code used for this is a G71, w/ 500 RPM.
The tool is a Sandvik top-lok 60 degree insert.
The program was initially set like this:
N0603 G71 X 0.9828 Z -1.50 I -0.0355 H 0.0928 D 0.0448 U 0.0024 B 60 F 1 J 14 M22 M73 M33
Note the first cut (D) at .0448 deep and the final (U) at .0024.
One tooling engineer said no cut should be more than .012 even if it's just the point of the threading tool. Another said the program is fine as the chip load decreases as the tool cuts deeper with each pass.
Who's right? I just want the stupid inserts to last more than 5 pieces.
Life is pain, Highness. Anyone who says differently is selling something.