Yes, I have done a search and I believe that my question is a bit different than the other threads.
I believe that for the past couple of years our criteria for calibrations have been handled primarily by the Outside Caliabration Sources. In an attempt to better understand what our accuracy requirements are I went to change the accuracy requirement to what the OEM (Mitutoyo) had stated for a Datatroq (range 25 - 250 in.lb.) "+/- 1% plus 5 increments from 10% to 20% of range; and +/- 1% from 20% to full scale." The Outside Calibration Source had been performing the calibration per the ASME B 107.14M, +/- 4%.
Well the torque wrench did not meet the 1% criteria, but does meet the 4% criteria. My question is should I have continued at the 4% because that is what the Outside Calibration Source normally uses for calibration? I do not know what accuracy is required.
An evaluation of the torque results showed a mean of 22 Newton Meters, while the specification is 12 Newton Meters minimum. We learned from the calibration that at 103.2000 standard the wrench read 100.0000, 2.168 in.lbs. below the 1% accuracy. Because our torque results are so high above the specification we are reasoning that the Out-Of-Tolerance (1%) did not allow nonconforming product to be submitted.
Any help or recommendations would be appreciated.
Thanks,
Doug
I believe that for the past couple of years our criteria for calibrations have been handled primarily by the Outside Caliabration Sources. In an attempt to better understand what our accuracy requirements are I went to change the accuracy requirement to what the OEM (Mitutoyo) had stated for a Datatroq (range 25 - 250 in.lb.) "+/- 1% plus 5 increments from 10% to 20% of range; and +/- 1% from 20% to full scale." The Outside Calibration Source had been performing the calibration per the ASME B 107.14M, +/- 4%.
Well the torque wrench did not meet the 1% criteria, but does meet the 4% criteria. My question is should I have continued at the 4% because that is what the Outside Calibration Source normally uses for calibration? I do not know what accuracy is required.
An evaluation of the torque results showed a mean of 22 Newton Meters, while the specification is 12 Newton Meters minimum. We learned from the calibration that at 103.2000 standard the wrench read 100.0000, 2.168 in.lbs. below the 1% accuracy. Because our torque results are so high above the specification we are reasoning that the Out-Of-Tolerance (1%) did not allow nonconforming product to be submitted.
Any help or recommendations would be appreciated.
Thanks,
Doug

