Electronics Forum | Thu Mar 28 13:19:14 EDT 2019 | davef
There is no industry standard for BTC stand-off height. "IPC-7093A Design and Assembly Process Implementation for Bottom Termination SMT (BTC) Components" just finished "Final Draft for Industry Review" in December 2018. It mentions stand-off height
Electronics Forum | Wed Nov 29 00:16:34 EST 2006 | mack3000
Hello everyone, May i know what is the acceptable component throwout rate/percentage for a smt machine(chip shooter and chip placer)in the industry today?
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 | 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 | Thu Mar 04 12:34:48 EST 2004 | cyber_wolf
I know that many smaller companies clean their stencils the same way you do. If you get good results cleaning your stencils this way then I would say stick with the alcohol/wipe method. Take your stencil and put it under a microscope.If the aperture
Electronics Forum | Thu Mar 04 10:45:19 EST 2004 | Robert
My company is relatively small but we have a SMT line. However, we don't have a stencil cleaner so I resort to a spray bottle of denatured alcohol, wiping it with a cloth and then using a toothbrush to brush the apertures. Finally another wipe down a
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
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