Graham and Doug,
Thanks for the feedback.
Graham,
Regarding my contact with the MUST manufacturer, it seems to me that I got
the wrong manufacturer name while searching the internet for "Wetting
Balance, MUST II". That explains why I did not receive an answer. Hope I did
not offend you or your company.
Regards,
Sherif Refaat, Eng.
----- Original Message -----
From: "Douglas O. Pauls" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, May 25, 2005 8:05 AM
Subject: Re: [TN] R & R evaluation
> 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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