Sherif,
I should also point out that the work Graham refers to is only the latest
in a long line of R&R work being done by the IPC solderability committees,
led by Dave Hillman. Past work should be available on the committee home
pages on the IPC Web Page.
For the ionic cleanliness testers, there was a large study done in the
mid-90s by the Ionic Conductivity Task Group of the IPC examining R&R of
all the instruments on the market at that time. The work was done by EMPF
when they were in Indianapolis and culminated in their report number
RR0013. The same document was provided to the IPC for their use and is
available as IPC-TR-583. The conclusions of that study were that none of
the instruments were repeatable or reproducible in any way, they should not
be used for product acceptance and the only valid use is for process
control within a facility, which is what they were designed for in the
first place. If you really want to understand the fallacies of relying on
these instruments (which have improved a little since then) for
good/no-good determinations, this would be a good report to start with.
Doug Pauls
Graham Naisbitt
<Graham.Naisbitt@
CONCOAT.CO.UK> To
Sent by: TechNet [log in to unmask]
<[log in to unmask]> cc
Subject
05/24/2005 06:16 Re: [TN] R & R evaluation
PM
Please respond to
TechNet E-Mail
Forum
<[log in to unmask]>
; Please respond
to
Graham Naisbitt
<Graham.Naisbitt@
CONCOAT.CO.UK>
Sherif
First off, Wetting balance Gage R&R is under preparation through the latest
IPC RR test program.
Ionic contamination testers would not suit Gage R&R due to the test
parameters not providing a constant defined start condition.
As regards the MUST manufacturer - I am he! Who did you ask for this
information so that I might address that problem?
--
Regards Graham Naisbitt
[log in to unmask]
NEW ADDRESS FROM 31ST MAY 2005:
CONCOAT SYSTEMS LIMITED
Unit B2, Armstrong Way
Southwood Business Park
Farnborough GU14 0NR
Phone: +44 (0)1252 521500
Fax: +44 (0)1252 521112
CONCOAT - Engineering Reliability in Electronics
CONCOAT SYSTEMS - Measuring Reliability in Electronics
A British Manufacturer
www.concoat.co.uk & www.concoatsystems.com
Cell: 079 6858 2121
On 24/5/05 22:41, "Sherif Refaat" <[log in to unmask]> wrote:
> Hi All,
>
> Is "R&R" evaluation applicable to "Wetting Balance" and "Omegameter"?
>
> I'm trying to convince my customer that the R&R evaluation is applicable
to
> gauges only and not equipment like "Wetting Balance" and "Omegameter",
where
> the results are printed out and the operator does not read a scale to get
> the result. I mentioned that proper calibration is enough to ensure
accurate
> readings, but the customer would like my company to use R&R evaluation.
>
> I have tried to get information from the manufacturer of the "MUST"
wetting
> balance, who took over from "Multicore", but so far there is no response.
>
> Sherif Refaat, Eng.
>
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