Ok I will try to give a visual of my problem,I am carving a piece that measures 24 inches long by 3 inches wide my sled length is 31 inches long by 6 inches wide when the machine is measuring the piece it measures 30.433 approx. a 1/2 inch short and asks me if i want it centered on piece and do i want to cut to length and I say yes to center and no to cutting to length when the carving begins it starts to carve about 1/4 inch ahead of the piece to be carved. I should state that I have used this sled for quite awhile with no problems, I noticed the problem started in Nov. at the same time I had other problems and sent the machine in to be fixed I always tell machine do not stay under rollers per the advice from other users, can someone shed some light on the subject and what is the fix. Thanks