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

Stijloor

Staff member
Super Moderator
#21
Re: How to carry out Gage R&R for automatic machines?

Failing to understand the concepts involved, the customer won't listen to reason and the supplier just manipulates the numbers in order to get on with his life. The customer looks only at the bottom line, and if it appears satisfactory, he gets on with his life and begins another line of ignorant nitpicking with another supplier. The result is that MSA is rarely used for improvement purposes, unless blindly satisfying the customer requirement is considered improvement.
How true this is....:(

This reminds me of "The blind leading the blind."

Painting by Pieter Breugel the Elder.

Stijloor.
 
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Bev D

Heretical Statistician
Staff member
Super Moderator
#22
Re: How to carry out Gage R&R for automatic machines?

I think you raise some interesting and valid points, as does the Wheeler paper that Artichoke posted. The problem is that the vast majority of people who use GR&R, and MSA in general, have no understanding of what the numbers really mean, or how they come to be. It's a customer requirement, so it gets done in the best tradition of automotive industry self-fulfilling prophecy. If the "ideal" number is < 10%, then that's what it will be, one way or another.

I've seen many instances where in a relatively simple application that's worked well for many years, a GR&R study is done and the results are >10%, or even 30%. Failing to understand the concepts involved, the customer won't listen to reason and the supplier just manipulates the numbers in order to get on with his life. The customer looks only at the bottom line, and if it appears satisfactory, he gets on with his life and begins another line of ignorant nitpicking with another supplier. The result is that MSA is rarely used for improvement purposes, unless blindly satisfying the customer requirement is considered improvement.
yes. It's really too bad. suppliers spend so much time checking the boxes they have little time or energy left to truly improve their processes. The blind compliance to AIAG etc. has obscured the opportunity to teach and learn. I'm coming to the conclusion that mnay of our "standards" are killing Quality.
 
C

cladiv

#23
Re: How to carry out Gage R&R for automatic machines?

Thanks for reply,

But our case is,Its a automatic measuring line system.there is no operator to place the part which we are measure.parts (we measure camshaft,crank shaft etc) comes through a conveyor system and it stops on the measuring station a lifter is lift the part for measuring.the meadsuring system measure the diameter, height ..........,we use digital sensors and mini probe some times air gauge then the parts goes to the next measuring station like that the process going.

For this system how can i study GAGE R&R.

I would suggest to load the same part on the conveyor belt and measure it for a total of 30-50 times to get a good estimation of repeatability.
In this case case your repeatability is given by the ratio between 6 Stdev of the distribution that you will obtain and the tolerance soread (USL-LSL).

In this case, your variation would be given by your gauge and the "conveyor belt" which would present the part to the gauge in slightly different positions.
 
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