Originally Posted by
saabaero
Thank you for the replies!
I wasn't aware of an axis calibration utility for the Tormach version of Mach so I went into the .xlm file and searched for the 'steps per unit' values for the axes. They were set at 10,000 for each linear axis. Since whe machine was moving a .0005" per inch less than it was supposed to I increased the value for the "X" axis to 10,005 (2000 steps per rev. * 5 pitch screw = 10,000 steps per inch * .0005 = 5 steps). The strange thing is that made the problem worse in that it was now .001" per inch short.
So I went in the other direction and changed the value to 9995. That brought the "X" axis travel to within .0002" at 16 inches!
In line with that I checked my "Y" axis also and it was short by the same amount my "X" axis was so I changed it to 9995 also and rechecked it over 8 inches of travel. It was then right on.
The "Z" axis checked out good!