Gauge R&R (Gage R&R) on Leica Laser Tracker

K

kevinclynes

#1
Hi all,

I have been assigned to carry out a Gauge R & R study on a Leica Laser Tracker.
Has anyone ever carried out a similar study on a Laser Tracker..?

As I am puzzled about how to carry out the study.

In previous Gauge R & R studies,I have measured 10 parts (in a mass production environment) using a CMM machine & 3 users performing 3 trials each.

The differences with this study is that it is not a mass production environment
(we only produce 1 off large fixtures) so I cannot use 10 samples..!
also the laser tracker is different to the CMM beacuase the CMM always relied on the controller & DCC software to measure exactly the same point each time on each sample.

Any help would be greatly appreciated.

Regards,
Kevin
 
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Kales Veggie

People: The Vital Few
#2
Kevin,

I have not dealt with this before. Thinking out loud...

Can you measure several similar features (internal and external diameters, tab height and so on) in deviations from nominal and simulate that you have 10 different parts?

Maybe other covers can ponder ideas as well.
 
K

kevinclynes

#3
Thanks for the reply Kales Veggie.!!

I think I know what you are suggesting,
however there are no diameters on the fixtures the Trackers measure.

I was thinking of measuring 10 points on a surface on the fixture,
but the 10 points will not be precisely in the same location for each user trial on the Gauge R&R.

I was also thinking of measuring a fixed independent artefact with the Laser Trackers,
but my concern there, is I am only introducing 2 variables into the Gauge R & R,(Laser Tracker & User)
whereas,to conduct the Gauge R & R satisfactorily,I would need to introduce the Product (Fixture) as an additional variable.

Any more suggestions from the worlds experts would be greatly appreciated..!!

Thanks in advance,
Kevin
 
L

Lanny

#4
Gauge R&R can be performed with a Laser Tracker by utilizing Certified Scale Bars designed for Laser Trackers, these are available from Brunson Instruments in the U.S. or you can buy one from Leica. The Leica Scale Bar is an Invar Bar 1 Meter long, Brunson provides longer length Bars. These Bars can be easily placed in different orientations, and the point to point distances verified, this is one of the best checks of a Laser Tracker System. Laser Trackers that are not functioning properly do not repeat distance measurements, but can repeat on Single Point measurements within their specifications. The Scale Bar gives you a Standard that can be checked by all of your machines including your CMM by placing a 1.5 inch Diameter sphere in the same holder the Cornercube (SMR) will be placed when measuring with the Laser Tracker. The Leica Laser Tracker should yield results well within the Specification Sheet Leica provides, they typically are much better then Leica specifies. Good Luck with your testing I hope this info is not too late to help you out. If a Scale Bar is difficult to come up with, acquire some Heavy Duty Sphere Mounts and place these on a stable surface (CMM Bed) they are available from Hubbs Machine (website is their company name)using Hot Glue and measure those as Single Points, yes the Hot Glue works extremely well.....
 
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