Hey,
I am running emc 3.2.0 off the BDI with Jon Elson's pwm servo boards. The
machine is a knee mill, of similar size and mass to a hurco.
This machine gets little use as its bigger brother does all the heavy lifting
so the problem i describe below might have existed for some time and not been
noticed based upon part configuration and tolerance.
I notice during the last few days, while machining a thin wall box that one
sidewall was thicker than the other. At first i assumed that i had a chip in
the vise when i loaded the part, however the next part had a similar
condition. I re-zeroed the machine and noted that it showed i was .010" off.
Ran the next part and it was fine, the second part showed some issues, and the
third clearly had a problem. Part is taking 17 minutes, and the properties pull
down shows 400" of motion.
I checked the machine for a loose belt, loose ball screw to thrust washer, and
loose ball nut, all of these looked fine.
I continued to run the code, cutting air and double checking the machine
position to the zero point on the vise. I am loosing .002-.005" to the in the
minus x direction.
I have checked for backlash within the working envelope with a dial indicator
and have not found anything that would alarm me.
Any ideas on what would causing a loss of position in one direction only it is
repeatably losing in the minus direction only. Mechanical, electrical,
anything at this point.
As always thanks.
Richard
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