geh7552,
Appreciate your answer, I was a Metrologist for a number of years and know how to measure accurately, however unless you are using Linear motors and Rails all mechanical systems will have backlash no matter how much money you spend, even in temperature controlled rooms. Metal will expand stretch and contract in mechanical motion and heat/cold. All guides with gibes will have issues. The balance (back and forth motion) and mass of the Z Drive head as it move up and down will have issues with minute angular tilts. The accuracy of the Ballscrew/Nuts and Trust Bearings and tightness all have backlash issues being some.
We have just completed two engravings without putting any backlash in Mach3 with ESS and both produced good results o.1mm deep.
Our precision Dial indicator shows only .00011" backlash at the engraving level when measuring the tip movement.
We had no issues with Parallel Driver with Mach3 also early ESS drivers did not produce these recent problems.
Regards,
Mauri.