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« on: October 29, 2012, 06:19:58 AM »
I never experienced the THUD you describe with my machines but have seen it happen on another users system.
He was running over 100 IPM along with about 0.1" of backlash. On change of direction you could hear when the backlash was taken out. Slowing down the max velocity in tuning and setting shuttle to to something lower ( try .05). Play with the settings and see if you can reduce the impact.
Note that the axis is stopping and then reversing very quickly and all that energy has to go somewhere....and in this case it
is thrown right back into the screw. How well the axis system reacts to backlash can be affected by how the backlash is
implemented and would think it can start to vary with higher forces ....so i echo what Hood said.
Anything that changes the cutting action of the tool, in this case backlash comp, will affect the cutting continuity and is reflected in the finish.
No perfect answer and every machine will behave a little differently,
RICH