Well I tried a regular tool bit and it made a big difference. Positve rake and 15 deg back 5 degrees down in front and 10 deg down on leading edge. Also added deepgrooves 425 oz/in steppers. Now it goes 50ipm and cant stop it. Wow. The steppers were a big improvement over the 270 oz/in I had. Also redesigned the Z axis motor mount. Now mounts to frame instead of screw bearing block.
The biggest gain was uping the pulse in mach3 from 25,000 to 35,000. Motors had
alott more torque. I don't know why that made such a difference but it sure did. Difference is night and day. If I would have known that I wouldn't have needed to mount those 425 oz motors.
Has anyone tried this software for lathe. Looks like it might work well for simple curves etc.
http://stcnc.tripod.com/dxftools/
Donny
http://www.whiterivermfg.com