ASME B89.1.13 question regarding Resolution and Maximum Permissible Error

N

NTAinc

#1
We purchased a new pair of outside micrometer recently. The micrometers measure from 1 to 2-in and have a resolution of 0.001-in. According to ASME B89.1.13 the maximum permissible error for a 1-in range is +/-0.00010 inches. How can I meet this tolerance if I can't resolve the measurement to that degree? All our other micrometer have a resolution of 0.0001-in and so can meet the requirements of B89.1.13; B89.1.13 has always been the standard I used to determine if micrometers are acceptable for use (as the tolerance stated is adequate for our purposes). This new micrometer is for a different purpose where +/-0.0001 accuracy is not need but does that mean I can't state that it meets B89.1.13?

Any insight to this conundrum would be greatly appreciated.

Thanks,
Tessa
 
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Stijloor

Staff member
Super Moderator
#2
We purchased a new pair of outside micrometer recently. The micrometers measure from 1 to 2-in and have a resolution of 0.001-in. According to ASME B89.1.13 the maximum permissible error for a 1-in range is +/-0.00010 inches. How can I meet this tolerance if I can't resolve the measurement to that degree? All our other micrometer have a resolution of 0.0001-in and so can meet the requirements of B89.1.13; B89.1.13 has always been the standard I used to determine if micrometers are acceptable for use (as the tolerance stated is adequate for our purposes). This new micrometer is for a different purpose where +/-0.0001 accuracy is not need but does that mean I can't state that it meets B89.1.13?

Any insight to this conundrum would be greatly appreciated.

Thanks,
Tessa
Anyone to help Tessa?

Thank you very much!

Stijloor.
 
M

MIRCS

#3
We purchased a new pair of outside micrometer recently. The micrometers measure from 1 to 2-in and have a resolution of 0.001-in. According to ASME B89.1.13 the maximum permissible error for a 1-in range is +/-0.00010 inches. How can I meet this tolerance if I can't resolve the measurement to that degree? All our other micrometer have a resolution of 0.0001-in and so can meet the requirements of B89.1.13; B89.1.13 has always been the standard I used to determine if micrometers are acceptable for use (as the tolerance stated is adequate for our purposes). This new micrometer is for a different purpose where +/-0.0001 accuracy is not need but does that mean I can't state that it meets B89.1.13?

Any insight to this conundrum would be greatly appreciated.

Thanks,
Tessa
Yes that is the correct accuarcy for that micrometer. The only thing different is it doesn't have a vernier etched in it.

However it seems to be the practice of calibrating micrometers to the minimum graduation
 
N

NTAinc

#4
Mircs,
Thanks for your reply and I apologize for not getting back to this sooner. I initially thought to calibrate to the smallest graduation but can I still claim that the calibration meets the accuracy requirements of ASME B89.1.13?

Thanks,
Tessa
 
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