Analysis of GRR studies, MSA 4th Ed, Chapter III section B - Rigid

[jelly1921]

In MSA 4th, Chapter III section B
Analysis of GRR studies

if repeatability is large compared to reproducibility, the reasons may be:
the gage may need to be redesigned to be more rigid.

Here RIGID means dicrimination? or less location/width variation?

Thanks!

Jelly

 

[Jen Kirley]

Re: Analysis of GRR studies

Good day Jelly,

Here I will refer to the Free Online Dictionary to help with definition of rigid:

1. Not flexible or pliant; stiff.
2. Not moving; fixed.
3. Marked by a lack of flexibility; rigorous and exacting: "We have watered down a rigid training . . . until we now have an educational diet in many of our public high schools that nourishes neither the classes nor the masses" (Agnes Meyer).
4. Scrupulously maintained or performed: rigid discipline. See Synonyms at stiff.

The MSA Manual is suggesting some inspection setups allow spring or flexibility in the measurement setup, for example in long arms of a device suspending a dial indicator over a point on the surface plate where a part will be placed for dimensional reading. Minimizing that flexibility, perhaps by shortening the arms on the indicator stand, is increasing rigidity.

I hope this helps!