I finally was able to down load the xml file and had to do a lot of fine tuning. The x axis runs very good on the mach 3 demo. The y axis was harder to tune and it also will run on the demo, but when trying to run both the x and y on the demo they start growling and sometimes stop. I have tried two different computers and a second breakout board. still have the same problem. I don't know what to try next. Any help is appreciated.