I am having trouble with my mill, it seems that I am losing steps. The mill is set up as per my signature.
I am using an indicator mounted in the spindle, I zero out the indicator on a bar clamped to the table parallel to the Y axis, making sure to remove any possible backlash. I then make a G1 move in the X axis of -2.953" (75mm) and then insert a 75mm Jo block. With the feed rate set to 4 IPM the indicator reads .000. I then remove the backlash and rezero my indicator on the Jo block, remove the block and make a g1 move in the X axis back to 0. The indicator will read -.0015. I did this 3 time at this feed rate and had the same results. When I increase the feed rate to 6 IPM, I get an indicator reading of -.001 on th first negative X axis move, but it is off --.035" on the move back to 0. If I increase the feedrate to 10 IPM I get -.006" on the negative move and -.067" on the move back to 0. If I do a G0 move it is off almost -.185" on the move back to 0.
I've do some limited testing in the Y and Z axis and don't seem to have any issue, the indicator reads within .0005" both directions.
Any idea what might be happening?
Thanks
Tom