This problem showed up when trying to make a rotary jig left side as multiple cuts in at various depths in the ends where it is supposed to keep cutting in one line slowly increasing the depth of cut. I am using a 36" flat board and head pressure is 92 lbs and board sensor shows 0 and 137. the closest I can calibrate is to 35.00 inches and if I try to change the calibration number any further, (ie something under 877.000), I get an out of range error message. I went thru all the adjustments and cleaned it and lubricated the machine. the damping spring is on and I put on a new o ring and and checked the pressure rollers and nothing seems to correct the problem. the measurement used to be ok with this calibration board but now it isn't. I am lost as what to try next help please and thanks for any suggestions