I have been trying out 3d contouring with my mill and notice very jerky motions when in the XY plane. It has me scratching my head. First some background.
When using canned cycles in either conversational or iso modes, the circular interpolation is smooth as butter. All seems smooth when doing helical motion (movement in three planes simultaneous) while in ISO mode. When I use a cad/cam program to create code to cut circular contours and pockets (2d) without using canned cycles the machine appears to be in exact stop mode.
I have experimented with MP91 (constant contouring speed on corners) by setting it at various points in the range from 0-179.99 degrees. The default was 10 when I got the machine a few months ago. *At slow feed rates, the motion seems to improve as I increase the value. *But at speeds above 50ipm no setting is usable.*
Is there a MP that I am overlooking to take this out of exact stop mode?*
Is this motion common for these controllers?
I have discovered that the Heidenhain gcode implementation is no longer (if it ever was) compatible with the current standards. *Has anyone uncovered an English version of the Heidenhain ISO programming manual for the TNC151/155 control? *The Heidenhain site has a couple but none in English.*
I have a home brewed CNC router running Mach3 doing 3d contouring in wood and aluminum with ease. *Since 3d contouring with the mill is a must for me, this behavior has me contemplating a retrofit. *I will likely move to LinuxCNC so I can maintain much of the electronics and a closed loop servo system. *
Any thoughts or suggestions are welcomed.
Mark*