GR&R on automatic equipment such as a CMM - Do you still have to use 3 operators

G

Greg Pitre

#1
If you are doing a GR&R on automated equipment such as a CMM. Do you still have to use 3 operators even though the operator has nothing to do with the measurements?
 
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Jim Wynne

Staff member
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#2
Greg Pitre said:
If you are doing a GR&R on automated equipment such as a CMM. Do you still have to use 3 operators even though the operator has nothing to do with the measurements?
Who sets up the machine?
 
G

Greg Pitre

#3
Equipment has a fixture

Very good question, The Machine has a fixture. All you do is place the part on the fixture and push a button. The machine finds the part and sets its datums then measures the part.
 

Marc

Hunkered Down for the Duration with a Mask on...
Staff member
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#4
I would *assume* that if it's a matter of pushing buttons operators wouldn't effect the outcome unless setup is an issue, but I'll leave it to the experts here to tell us.
 

Jim Wynne

Staff member
Admin
#5
Greg Pitre said:
Very good question, The Machine has a fixture. All you do is place the part on the fixture and push a button. The machine finds the part and sets its datums then measures the part.
You have to be certain that operators who have to set retrieve and set the fixture, call up the program, and set the part in the fixture aren't capable of producing variation before the button gets pushed. That being said, I found this contribution from Howard Atkins that might be helpful: Gage R&R Study on Laboratory Scales You can search the Cove for more discussions on the subject.
 

Miner

Forum Moderator
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#6
Jim makes a good point. If the setup of the fixture or the placement of the part in the fixture has the potential of being influenced by the operator you should perform the standard GRR method.

If you are confident that the operator can have no influence on the setup, you have the option of performing the stability study in the MSA 3rd edition manual. A secondary result of this study is the definition of the gage repeatability.
 
P

prabhudvp

#7
cmm

Yes, it needs

The two important factors that influence the repeatability of CMM ARE

1. Temperature(more imp for Aluminium)
2. Dirt

These are inflenced by cmm operator by amount of time he leaves the part for stabilisation near cmm,and the way he cleans the datums .

-Prabhu
 

Miner

Forum Moderator
Staff member
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#8
prabhudvp said:
Yes, it needs

The two important factors that influence the repeatability of CMM ARE

1. Temperature(more imp for Aluminium)
2. Dirt

These are inflenced by cmm operator by amount of time he leaves the part for stabilisation near cmm,and the way he cleans the datums .

-Prabhu
Then I recommend the standard GRR method. In addition, make certain that the operator removes the part from the fixture between trials. In fact, I recommend that the parts be returned to the "original" environment (temperature and "dirt") between trials, so that the operator must bring the part back, allow it to stabilize and re-clean the datums before the repeat measurements.

Unless the fixture is a permanent attachment, it should also be removed and re-installed between trials.
 
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