I'm using Mach3 with a computer running Windows XP and a HobbyCNC driver board.
I've noticed that the Z-axis motor will rotate slightly during runs on the X-axis only.
It is stable on Y-axis runs.
I'd love to get rid of the drift...
And, yes, I've already added the extra capacitors to the cables going into the HobbyCNC board to ground out cross-talk.
So I'm open to new suggestions...
Chet

Either electrical noise, possibly even on the output side of the drives or you have duplicated pins in Mach.
If you attach your xml I can check your config.
Hood

Okay, which of the reply icons would I use to attach that file???
On regular e-mail I'd be confident, but I'm not seeing what I'm looking for in the icon list.
Of course it could be there, I just don't recognize it...
Chet

On the reply page you will see the additional options button, you can use that to attach your xml. You may need to rename it first though if it has a standard name as the forum only accepts a file name once.
Hood

Okay, let's see if I'm uploading the file correctly...
Hope you find something useful...
Chet

Dont see any problems of pin duplication in your config so it is likely that it is noise getting into the wiring.
Hood

Just performed an interesting test...
There is NO drifting of the Z-axis when I manually move the carriage along the X-axis with the keyboard commands.
It only occurs when the X-axis is moving during a program execution.
What does that imply??

Seems strange unless your code is calling a Z axis move. What if you MDI a X axis move?

Hood

MDI????
If this refers to moving the X-axis from the keyboard, I can do that without Z-axis drift.

MDI is manual Data Input
When you said you were moving via keyboard I presumed you were meaning jogging but you are meaning via entering G Code commands in MDI line?

If you are then I cant see how that would be any different than from Mach running code from a file.

When you start Mach and hit the Reset button for the first time do you get any messages?
Hood