BP series 1 Strange acting Y-axis

[bartL]

Hello,
A few days ago I figured I was losing steps on my Y-axis while I was cutting a circular pocket. When I saw it again today I did some measurements but it wasn't really what I expected.
While doing a rapid move (G0) I didn't loose any steps, but when I did a really slow cutting move (without any load) it almost lost half of his steps!!! I told him to move 50mm but it only moved 23mm. What can this be?
I already checked the transistors, the DC voltages on the bridge and the current on the Y-axis fuse on the bridge.
Any help would be great cause I got work to do with the machine.

Thanks,
Bart

[bartL]

Nobody here who can help me? If there is somebdoy here who recognizes this problem please explain it to me!

Bart

[mc-motorsports]

I would repost and put either what servo's, steppers and or drivers in the post title, should net you more response. Good luck!