Digital Torque Meter Gage R&R

B

b9ofus

#1
Is there a method to perform a GR&R on a digital torque meter? Typically when doing GR&R's, we use 3 people, 10 parts, 2 trials. The 10 parts is what I am struggling with. We could check, for example 10 screws that are torqued into a device. However, once you check them the first time, you have probably changed the torque value just by checking it. So second trial and other operators will always have different reading which will result in a GR&R failure. Any ideas? One idea I had was to check a torque wrench set to a specific torque value. But that is only one part, not 10.

Kerry
 
Elsmar Forum Sponsor
C

Curtis317

#3
Do you have Minitab? In it you can do a "nested" GRR. This is for destructive testing. I have not done one but have considered the problem of a GRR on a Torque wrench. Be it digital or non digital is it still the same problem. Follow the stat guide in Minitab and it will help you through it.
 
B

b9ofus

#4
Thanks Curtis,

We do not use minitab as our spc software but I believe a version of it came with our vision system software. I'll check it out.

Kerry
 

ScottK

Not out of the crisis
Staff member
Super Moderator
#5
here's some stuff:
http://elsmar.com/Forums/search.php?searchid=4383978

Personally, I would do everything I could to rationalize NOT doing a R&R studay on a torque gauge. Maybe an attribute R&R. Maybe.
My real world experience with torque is in the plastic bottle and closure world and the varaiation in the process was so wide that you'd never get satisfactory R&R results.
 
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