Hi Paul - I am confused by one of your statements - " GR&R is intended to
evaluate the
entire process: the machine, the measurement tool, and the operators." My
understanding of the use of GR&R (as I have been brainwashed by our local
statistical terrorist) is to evaluate the measurement tool for its inherent
accuracy and precision. For example, I would test a wetting balance's GR&R
by using the test method procedure and a standard sample, preferably
something such as a NIST standard or I would test a surface mount placement
machine by placing components on a calibrated, standard grid board, etc.
The ANSIJ-STD-002/003 committees have been successfully using GR&R to
assess or setup criteria that the measurement devices must have before you
would use them in a test -  the theory is can you must be able to
distinguish the signal you want to measure from the noise surrounding it
and then apply the measurement to the system you want to understand. If you
can't separate the signal from the noise then don't bother making the
measurement. You should be able to obtain a GR&R for the WaveRider if you
could measure it against a known temperature source and/or a known conveyor
speed standard.

Dave Hillman
Rockwell Collins
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[log in to unmask] on 04/17/98 06:12:04 PM

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cc:    (bcc: David D Hillman/CedarRapids/Collins/Rockwell)
Subject:  [TN] Assy:WaveRIDER Gauge R&R




I read a quick question about WaveRIDER as to whether a Gauge R&R Study has
been done and have the following to offer:
We (the Manufacture) looked into GR&R as a possible means to "qualify" the
validity of the measurements made by the WaveRIDER and elected NOT to use
this method because it seems to apply best to a very limited set of
condition not necessarily represented by a WaveRIDER. Combine that with
limited understanding of GR&R (except those who have made it their ambition
to understand it) and what the results really mean, we found they would
only serve to confuse general users. Also, GR&R is intended to evaluate the
entire process: the machine, the measurement tool, and the operators. Thus
any results we get would only represent our process, and any results you
get your process, and so on. We have, however, done some Cpk studies on the
WaveRIDER's various measurement parameters which yielded values 1.5 and up,
depending on the measurement. These studies served only to prove that our
specs for the WaveRIDER are valid. In general, the WaveRIDER measures
temperature within +/-1 degree C and time to 1%+/-0.1 seconds.
Thanks for the question.
^^^^^^^^^^^^^^^^^^^^^^^^^
Paul Austen
Project Engineer
New Product Introduction Team
ECD Inc
4287A SE International Way
Milwaukie OR 97222
Phone: 503.659.6100
Fax: 503.659.4422
Email: [log in to unmask]
Web: www.ecd.com
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