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September 2007

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Subject:
From:
Ahne Oosterhof <[log in to unmask]>
Reply To:
Date:
Thu, 20 Sep 2007 08:05:33 -0700
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How about Daniel?
Ahne 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (EHCOE)
Sent: Wednesday, 19 September, 2007 14:53
To: [log in to unmask]
Subject: Re: [TN] Reliability of Class 1,2,3

I vote for Jack.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kathy Bergman
Sent: Wednesday, September 19, 2007 2:48 PM
To: [log in to unmask]
Subject: Re: [TN] Reliability of Class 1,2,3

Do you have the pictures of Roscoe that you can send me so I can show
Jennifer what he looks like so she can put in her vote for his new name.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rob Strecker
Sent: Wednesday, September 19, 2007 2:29 PM
To: [log in to unmask]
Subject: Re: [TN] Reliability of Class 1,2,3

Let me rephrase the question.  
What is the benefit of moving from a class 1 to 2 or class 2 to 3?

Rob  



-----Original Message-----
From: Guy Ramsey [mailto:[log in to unmask]]
Sent: Wednesday, September 19, 2007 10:58 AM
To: 'TechNet E-Mail Forum'; Rob Strecker
Subject: RE: [TN] Reliability of Class 1,2,3

I don't think you are understanding the requirement. Do you have J-STD-001? 
SPC is required if you are not going to do 100% inspection. If you are doing
SPC then your quality team and statistical process results will tell you
what you need to do. 

A place you might look for help is the text, Statistical Process Control for
Surface Mount Technology, by William S. Messina.



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rob Strecker
Sent: Wednesday, September 19, 2007 12:05 PM
To: [log in to unmask]
Subject: Re: [TN] Reliability of Class 1,2,3

Kat,
Actualy we are looking at ways to reduce inspection and still maintain a
class 2.  Does IPC have anything on method and frequency of inspection?

We may do something similar to what you have done, develop an inspection
matrix for our products to determine critical inspection points.  I guess
the question is if we were to eleminate inspections completely (we would
still maintain 20% inspection end of oven, or some form of it) could we
still say we work to class 2, when we only look at the boards if they fail
test?  How can we say we work to any class if we don't look at the boards?

Rob

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kathy Kuhlow
Sent: Wednesday, September 19, 2007 9:00 AM
To: [log in to unmask]
Subject: Re: [TN] Reliability of Class 1,2,3

Rob, 

I would think a class change to reduce inspection is the wrong approach
since the class only has to do with acceptability criteria instead of method
and frequency. 

Can you support reduced or implement inspection sampling plans? I have also
been able to reduce inspection labor through critical and high risk feature
identification so that labor is put towards those items needing more
attention. 

Can you provide more detail on the inspections that you want to reduce? 

Kat

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rob Strecker
Sent: Wednesday, September 19, 2007 9:15 AM
To: [log in to unmask]
Subject: [TN] Reliability of Class 1,2,3

I was wondering if there is any documentation out there stating the
reliability of products built to IPC class 1 compared to class 2 or 3?
We are a class 2 manufacture and are looking at reducing our inspections,
however will this put us in the class 1 category by default if we only catch
defects at functional test?  What inspection must we do in order to maintain
class 2?

 

Thanks,

Rob

 


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