Electronics Forum | Wed Sep 13 22:29:10 EDT 2006 | davef
attrition
Electronics Forum | Thu Sep 14 15:02:51 EDT 2006 | teamcanada
Thanks for the input!
Electronics Forum | Wed Sep 13 11:23:37 EDT 2006 | teamcanada
Is there any published info on acceptable losses in SMT assembly. Especially for small to medium sized production runs with switch overs several times weekly Different losses for component sizes and packaging? Thx Vaughn
Electronics Forum | Fri Jan 04 15:27:04 EST 2002 | davef
There is no standard. Component loss is a function of many factors, including: * Component type. * Component packaging. * Machine capabilities. * Feeder maintenance. Search the fine SMTnet Archives on attrit* for some guidelines.
Electronics Forum | Mon Sep 18 10:34:47 EDT 2006 | SWAG
Yea, 10,20,40,60 over or 2% for large issue qtys. would be ideal as we do run out of parts often if the issue qty. is very high.
Electronics Forum | Mon Sep 18 10:36:47 EDT 2006 | SWAG
We toss extras at tear-down unless it looks like an unusually large amount which could = qty. pick error from warehouse. In that case, we do a cycle count. All overages are issued when the kit is pulled so they are already taken out of stock.
Electronics Forum | Wed Sep 13 12:42:48 EDT 2006 | russ
much prefer using percentage instead of fixed overage. Example.... A run needs 100,000 parts, (1% shrink is 1000 parts!) you want to only issue 60 over? I recommend 2% for popcorn and exact for retrievable/ identifiable parts like sticks and trays
Electronics Forum | Fri Sep 15 10:20:26 EDT 2006 | russ
Yes indeed you make great point as well, we also run low volume production as well as some high running stuff, seems as though some type of combo nwould be best, maybe something like 20 pieces over or 2% wichever is greater maybe? Russ
Electronics Forum | Mon Sep 18 10:40:15 EDT 2006 | SWAG
Depending on what kinds of machines you run and feeder style, self adhering leaders work well to minimize the need for a long leader. We use them on every reel. We can generally load most feeders with only waste of about 4 parts by use of leaders (
Electronics Forum | Thu Sep 14 18:10:12 EDT 2006 | SWAG
Good point Russ but we do builds that comprise of 50 of this and 100 of that. Our high average issue might be around 400 or 500 parts but most are under 100. 20,40,60 flat over-issue gets us set-up and error scrap. 2% of 50 is 1 part. 2% of 500
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