Hi Angelo,
Don't you just hate that? For customers to not allow any attrition is just
plain silly. Give me a few extra parts so I can get the run done, and if
there's any left over, I'll send them back along with the completed
assemblies.
How much attrition should be sent with the kit depends on a few things.
First, what kind of component are we talking about? Passive components like
caps and resistors, or active components such as IC's?
As a general rule, I've always thought that asking for an extra 3% for
passive components and an extra 1% for active components is not out of line.
If there's any real expensive, hard to get, or long lead components in the
mix, I'll understand why there isn't much attrition provided, and take the
additional extra steps necessary to try and make sure we don't lose any.
A lot depends on what type of pick and place machine you have, and how the
material was provided. We have a Mydata with Agilis feeders, so we can deal
with strips pretty easy. But for most other machines if you get a kit with a
bunch of strips with no leader, you'll blow through that 3% just loading the
feeders.
The customer needs to understand why they need to provide the SMT parts in
the kit with some reasonable attrition, otherwise expect delays and missed
shipments at the end of the run.
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Angelo DiMichele
Sent: Wednesday, August 03, 2011 9:38 AM
To: [log in to unmask]
Subject: [TN] SMT shrinkage
Is there an industry standard that states the percentage of components a
customer should send above and beyond the required quantities, when they
supply a completed kit for assembly? Some of our customers send exactly
enough SMT components to complete the assemblies and then complain about
receiving shortage requests at the end of the run.
AMS Electronics Inc.
113 Pillow Street
Butler, Pa. 16001
Ph: 724.282.2107
Fax: 724.282.1057
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