CREED said:
DOES ANY ONE KNOW WHAT THE RECOMMENDATION FOR PV% SHOULD BE. ACCORDING TO THE MSA MANUAL, GRR% SHOULD BE UNDER 10% GOOD, 10%- 30% MAY BE ACCEPTABLE, OVER 30% NOT ACCEPTABLE. ndc SHOULD BE GREATER THAN 5. BUT IT DOES NOT GIVE ANY GUIDE LINES FOR PV%.
The difference between the metrics is %GRR is the acceptability of the gage for process control (or statistical/capability studies) and P/V is the acceptability of the gage for product acceptance (inspection).
See the following threads for more detail:
http://elsmar.com/Forums/showthread.php?p=124339#post124339
http://elsmar.com/Forums/showthread.php?p=125257#post125257