here is a picture of the finish acme thread. it is not very clear but you can see the tickness of the thread decreasing as the z axis gets further from z zero. in the mean time, i tried with an older version of mach 3 that used to work with no better success. for the x axis this is very strange, on the first pass the x axis is moving out about .03" over the six inch lenght, i can see the motor turning and the x dro moving on the screen. this proble realy sucks, hope someone is going to come up with a good idea