I notice the ideas of change seem to be focused on assembly. From the perspective of board fabrication, I can say we have discussions about changes and whether or not we need to notify customers.  There are a lot of opportunities to make changes. Next time a customer brings up the point about change notification, I think I will ask for an example of a change about which they would want to be notified, and one about which they would not want to be notified. Louis Hart

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: Friday, May 27, 2016 6:00 AM
To: [log in to unmask]
Subject: Re: [TN] How much change is change?

One of the process variables that people always forget is time.  "WE haven't changed anything, but our yield is way down " 
Then you find on investigation that there is a major undocumented change in that. Example from low volume line: Assemblies being stacked for batching.
If production rate or batch size changes then the waiting time from first to last in the stack can also change considerably. Typically batch paste printed boards waiting to go to P&P or reflowed boards waiting for cleaner.
It can have significant effect and produce nice intermittent fault rate.

--
Regards 
 
Mike 

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