I ran this program in MDI
F1000
G20 G90
M98 P1234 L50
M30
O1234
G1 Y -4
G1 Y0
M99

set DTI to object in vise usually went over teh zero and then jog back by .0001 increment to zero.  run program first time get .0005 beyond zero.  run the program every time there after get the DTI land in same location all teh time.  Does that mean too much backlash comp?  Something else?