I just changed the pulley wheel that I had on the X axis, and also bought myself some 35 lb test stainless steel polyurethane coated fishing wire. This really made a difference in the smoothness of the operation. The smaller pulley gives me a much more controllable rate of movement on the x-axis. I have successfully run the roadrunner tap file with full control passed to Mach3 and got a very acceptable rendition of the bird on paper. Just a matter now of fine tuning and some safety issues along with setup of some of the coolant circuits as on off switches for the stitch controller and I should be ready to do a full scale test. I'll keep you posted and will soon publish some photos of the project.