Kindly checking with the following items:

### If the Z axis original point are in the same height?

### If the wood work piece are flat enough, in the same thickness?

### Is your machine worktable any deformation?

If all are ok?

Adjust the following items, showing in the picture with red and black circle notes:

###Adjust the red circle notes：the spindle fixed clamp, let the two spindle in the same height

###Adjust the black circle notes: adjust the tool length, let the two spindle in the same height