02-21-2015, 03:18 PM
(02-20-2015, 06:27 PM)f350ca Wrote: I imagine the references are to grinding the tool to accommodate the helix angle.You need no or negative clearance angle on the right side of the cutter, the helix looks after that.
If we simplify the thread to straight lines a 1inch dia 10 tpi would be angled at 5.7 deg. So the left side needs probably a 10 deg clearance angle, and none on the right. Thats the sides with the tool facing the work ready to cut, opposite if your looking at the tool from the business end, or the other side of the lathe, if its not against a wall, then you'd need a mirror and Im not sure which side would be up then.
No idea how to get a sketch on here to give you a better idea Ed, draw up what you think I mean and I'll tell you if thats what I was thinking, if I can remember that far back.
Greg,
Is this what you're describing?
Ed