Hey Hood,
Backlash is not setup. The designer of the machine informed me that he had backlash enabled when the machine was tested and is going to send the parameters that were setup at time of testing which, I am told, the machine was running perfectly and was not losing position at all. The big issue I believe is not owning the computer that the machine was setup with orginally.
This has been an ongoing problem. The machine preforms a move called the crossover. After machining one side of the surfboard the machine crosses over to complete the other half. When it did this Z would end up about 2mm lower than it should be cutting one side of the board thinner than the other. Swapping drives did not change a thing. I added a G28.1 command that would of course send z back to home switch and "find itself" and then move down to cut the board. Essentially I coded out of the problem for now.
Y loses itself in the same fashion. About the same amount out as Z was lost. I have added a 28.1 that has reduced the issue to a manageable point but again would like to find what the issue is.
I swapped drives (only x has been consistently spot on) and quadruple checked any kind of binding issues. I did fresh installs of MACH and just recently optimized the system as well as updating drivers (which did improve the driver tests).
There are "sensitivity" settings on the drives which can be increased. This is about the only thing I have not toyed with but will be going there next if all else fails.
I believe the drives are Gecko's. I will investigate the details and post asap.
Thanks once again !
S