How to carry out Gage R&R for automatic machines? Automated Equipment

S

syeedabu

#1
Hi

I am syed,
I want to know that how we do Gage R&R study for Automatic machine.
for automatic machine no appraiser in needed.So how we calculate the reproducibility in this case.

regards
syed
 
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Miner

Forum Moderator
Staff member
Admin
#2
Re: How we study Gage R&R for automatic machines

It depends on the machine. If it has multiple stations, treat each station as an operator. If it only has one station, you can perform a simple repeatibility study using an Xbar/R chart.

For example, take 10 parts and measure each part 5 times. Plot the average and range for each of the 10 parts on an Xbar/R chart. You can assess the Range chart and the Xbar chart exactly as a standard MSA. You can use the Rbar to estimate the standard deviation for Repeatibility (Rbar/d2), and can use this to calculate the P/T Ratio or %GRR as required. The total GRR will equal the GRR due to repeatibility since there is no reproducibility component.

All normal rules for collecting samples still apply, that is the samples must represent the actual process variation.
 

Howard Atkins

Forum Administrator
Staff member
Admin
#3
Re: How we study Gage R&R for automatic machines

Welcome to the cove

If you look at the bottom of the page you can see some more discussions on the same issue.
Please look at them as well

As there are tolerances the mounting of the sample on the fixture, even if it is automatic , still is slightly different
 
S

syeedabu

#5
Re: How we study Gage R&R for automatic machines

Thanks a lot.
That threads will be halpfull to me

:thanx:
 

Bev D

Heretical Statistician
Staff member
Super Moderator
#7
Re: How to carry out Gage R&R for automatic machines?

be careful with "automatic" machines - if the part is manually placed in a fixture then you do have real operator to operator differences to assess.
 
D

David DeLong

#8
Re: How to carry out Gage R&R for automatic machines?

be careful with "automatic" machines - if the part is manually placed in a fixture then you do have real operator to operator differences to assess.
Bev:

I think that you mean that the part is taken out off the machine and placed in a checking fixture and then is measured automatically. I would then agree that there would be a developed R & R value.

But

If the gauge reads the dimension automatically during the process, that would be quite different. In this case we would have to isolate 10 parts and run them through the automatic sensor with 2 or 3 operators and have 2 or 3 reps. There should be very little R & R unless we are reading a dial rather than a digital readout.

If the process would not allow one to run parts through more than once, then an R & R study may not be applicable here.
 

Stijloor

Staff member
Super Moderator
#9
Re: How to carry out Gage R&R for automatic machines?

Bev:

I think that you mean that the part is taken out off the machine and placed in a checking fixture and then is measured automatically. I would then agree that there would be a developed R & R value.

But

If the gauge reads the dimension automatically during the process, that would be quite different. In this case we would have to isolate 10 parts and run them through the automatic sensor with 2 or 3 operators and have 2 or 3 reps. There should be very little R & R unless we are reading a dial rather than a digital readout.

If the process would not allow one to run parts through more than once, then an R & R study may not be applicable here.
David,

You raise a very interesting point! Because even though the operator manually loads the part in the fixture, the checking/measuring/verification device could still establish a unique datum reference frame, or establish a new/unique "0" point so that the observed variation would only be part-dependent.

Does that make sense?

Stijloor.
 
D

David DeLong

#10
Re: How to carry out Gage R&R for automatic machines?

David,

You raise a very interesting point! Because even though the operator manually loads the part in the fixture, the checking/measuring/verification device could still establish a unique datum reference frame, or establish a new/unique "0" point so that the observed variation would only be part-dependent.

Does that make sense?

Stijloor.
If we load the same part differently each time, we would get different readings thus a R & R that could be substantial. We would be establishing different datums.

Also, taking the reading off a dial differs depending upon the angle of view. At perpendicular, we might read a 0 but looking at the dial from the left side, we might read a 1.

I really don't think one is taking the part and placing it in a fixture. I think the the part dimension is read once during the process such as on automatic screw machins and an R & R is impractical since we cannot run the same part though the process again and again.
 
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