ZZ Pin Gage Tolerances and Calibration

[crazyedd]

Hopefully I placed this in the correct forum. I have ZZ pin gages which are being calibrated using a laser mic. The pin gage in question is a minus 0.0340". On the mic we have used in the past, it always and still reads 0.0340 exactly. Using our new and more accurate laser mic, the reading is 0.03403". Considering the tolerance for a ZZ pin is 0.0002", when this number is rounded to 4 digits, it passes. Should this be considered a failure? Thanks for your help.

 

[Hodgepodge]

Technically, it should be rejected. Does your company have a procedure that defines rejection criteria? If so, follow it. It is up to your company to decide if the gage pin is acceptable or not. Determine the appropriate disposition and document it. Then follow your own rules.

 

[Jim Wynne]

Hopefully I placed this in the correct forum. I have ZZ pin gages which are being calibrated using a laser mic. The pin gage in question is a minus 0.0340". On the mic we have used in the past, it always and still reads 0.0340 exactly. Using our new and more accurate laser mic, the reading is 0.03403". Considering the tolerance for a ZZ pin is 0.0002", when this number is rounded to 4 digits, it passes. Should this be considered a failure? Thanks for your help.

If you have a ZZ "minus" pin with a nominal size of .034, it should be measuring .0338, or .0002" less than the nominal value. If it's measuring greater than .034, I'm guessing that there's either something wrong with the laser mic or it's not really a "minus" pin.