Post your XML and we will see what is going wrong here...

how does one do that. i guess what i mean is where in mach can i find the xml file.

Under mach3 there should be a Mach3Mill.xml file. please post that file

Thanks

How fast is your machine. My mill did the exact thing. Jogged just fine, but when I stuck in code it went all wonky at 45khz. I turned down to 35khz and ran perfect. I then changed the PC to a 2.4ghz p4 with 512m ram with a Lava dual PCI port card and it runs perfect at 45khz. My mill (Full size knee mill bit bigger than a Bridgeport) Now does full rapids at 180ipm X and 150 Y and runs the roadrunner file pretty darned fast. Before the new computer/card the fastest rapids I could get were 120 ipm each axis.

My feeling is it is a computer problem, not interference.

hmm yeah that may make sense. right now I can only run at 25KHZ and the fastest rapids I can get at that is 75 ipm . I noticed though that if I switch screens in mach while my machine is doing a rapid. my motors make a similar sound for a split second while it is switching. The computor is pretty old. its a windows 98 dell that I inherited so that may be the problem. if I could run at 35 KHZ I think Id be fine but its a nogo with this setup for now.
anybody else agree with this theory.

Sounds like the computer is right on the edge of not running mach.. Keep it at 25KHz

Yep. Get a faster computer.

Heck, I have seen P4s at goodwill!

Or Frys has some pretty good deals on no frills computers.