Does this sound normal?

[JAZZCNC]

You are right. I dont know what I measured before....
1 revolution gives 15mm travel on the Y axis (I havent measure the others)

When I tell it to move 100mm (G0 y100) it moves 150mm.

EDIT: Ok I remember how I measured it before. Using the auto-calibrate in Mach3 I get it to move 100 on the y-axis and it moves exactly that. It tells me the steps are 125, So that must be correct.

I dont know what that G0 y100 command is doing ...

Ok well, 15mm isn't a common pitch size but they do exist. However still, things don't add up.?

The drives are set for 2000 micro-steps and your direct drive to the motors. 2000/15=133.333333 Steps Per mm.

If we work it backward just in case the drives dip switches are telling porky's then from the Mach3 Auto calibrate setting 125 steps per with 15mm pitch this would give a micro-step setting of 1875.? I've never seen drives that allow this setting and the manual doesn't show it either.?

So something isn't adding up here at all.

Regards the G0 y100 command then it will move to y100 coordinate position which doesn't mean it will necessarily move 100mm. If you Zero the DRO then it should move 100mm.
To move a set amount without worrying about the coordinate location then you need to switch to incremental mode, try this next time.
G91 G0 y100 and it will move the amount asked for from the current location. When finished type G90 to put back into absolute positioning mode.