I'm a newbie, so here we go! I put in a reground Y-axis ballscrew, everything went well. The Renishaw laser raw data said we needed 40 microns of comping (very linearly) in the 508mm (20") of travel. We put the numbers into the U10 control and we got down to 8-9 microns. I would have thought it would have been within 3 microns or less. Every time we relasered and adjusted comps different results were attained. Sometimes we would put large comp numbers in a position and the laser graph shows no change in that area but somewhere else 2-3 spots would move. We finally stopped after probably 50 lasers or more. The best we could do is 3 1/2 microns. Can someone tell us how the comps work in this U10 control and any tricks to putting in the values? Thanks