Engraving depth problems

Hey, so I've been having some problems with controlling the handibot cutting depth. I use Vcarve pro and when I submit a job and the handibot cuts it out multiple times it's depth varies. Sometimes it'll cut the same depth, other times it cuts too light, and way too deep. I have no idea what I'm doing wrong. I haven't changed the depth on the Vcarve pro files, so I don't know why it's cutting the depth irregularly. Any advice would be really appreciated.

There are a couple of things I'd suggest looking at first.

One is the Z-axis speed in your VCarve file. If it's set too fast the tool can "lose steps" and vary the cutting depth. There are also settings for the maximum move and jog speed in the FabMo Settings menu. Those are in inches/minute and I usually set them to something conservative like 120

I'd also check the file and make sure that it's not lifting way up and hitting the top stops when it lifts between parts. If it does that it will lose location and your cut will have wonky depths. Same if it hits the bottom stop when its cutting.