Go/No-go Length Gauges - Length checking of beam assemblies

S

Sentinel

#1
We are currently implementing some go/no-go length gauges into our production line to assist with length checking of beam assemblies in manufacture. Typical lengths range from 1m to 1.5m with ±2mm tolerance on the length of th assembled product. The gauges have been drawn up with ±0.1mm on the go and no-go lengths. I have sent the gauges out for calibration and was wondering if it was acceptable to apply a pemissible limit of error of 25% of the ±0.1mm tolerance (±0.025mm) plus the measurement uncertainty of ±0.005mm from the calibration house, giving a ±0.030mm permissible limit of error on the go/no-go gauge. This would be against the aforementioned 4mm total tolerance.

Does this sound acceptable? Has anybody got any thoughts? Is there a standard I should be looking at for guidance?

Thank-you.
 
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Hershal

Metrologist-Auditor
Staff member
Super Moderator
#2
Re: Go/No-go Length Gauges

The approach you outline is fine, but keep in mind that if the measurement between the gage and the product is a visual measurement then you are seeking tolerances not easily detected by the eye.

If it is a mechanical comparison similr to placing the product into a master mold then it may work pretty well.
 
S

Sentinel

#3
Re: Go/No-go Length Gauges

Thanks Hershal.

They are mechanical go/no-go gauges and work fine - quick R&R study. It's just what tolerance to calibrate them to that I was confused about.
 
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