Encoders

Actually I wasn't assuming anything. By putting in your exact pitch calculation you are assuming that the pitch is accurate. I'm entering a calculation based on measurements because I know it is not. I don't care to fuss around with mapping ballscrews as my average is good enough for the tolerance of the machine I built. If you do wan't to map the ballscrews, wouldn't you want to measure your average real step ratio calculation with a physical device rather than assume it were closest to 4064 before you started?

Blazini,
Here is a link to THK's PDF referencing what I was referring to in terms of the accuracy of a ballscrew, they compare the commanded position vs the actual position. you can see the error that compounds on a typical screw.

pg 15-13

tech.thk.com/en/products/pdf/en_a15_011.pdf