Electronics Forum | Thu Apr 08 03:08:37 EDT 2004 | janetan@mmi.com.sg
If you are referring to SMT chip components, 3-5% is the norm. BUt for some critical items like IC it usually applied as one to one exchanged if it is the component's defects. If the defects cause by processes, then manufacturer had to replace you .
Electronics Forum | Sat Jan 29 23:55:58 EST 2005 | KEN
I recently ran a process evaluation (Print/ P&P /Reflow) and was plesently surprised with a 5.0 sigma process or 250ppm. Attrition was under 1%. Keep in mind this is defects counted Post-reflow. The most signifficant defect was tombstoning / draw-
Electronics Forum | Tue Aug 02 04:52:16 EDT 2005 | aj
Crishan, You must be seeing an incredible amount of Attrition on this component if this is the case. You should most definitely be able to put in a Pick-up offset either at the machine or in the part data. aj
Electronics Forum | Wed Mar 15 22:08:20 EST 2006 | davef
Brad We agree with Rob. Even if the fab marks the fids [on both sides] to reduce component attrition, you'd be surprised in the amount of paste that 'disappears' on x-out boards. Do the numbers [follow the money].
Electronics Forum | Wed Jun 14 22:05:23 EDT 2006 | davef
Your goal is worthy, but we'd be concerned about Palm handheld population attrition.
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 | Thu Oct 21 15:30:56 EDT 2010 | remullis
Search on Attrition, I think most companies start around 2% across the board. I have adjusted mine higher for 0603, and parts where I experience tape issues constantly. We are running parts with date codes back 2006,2008.
Electronics Forum | Fri Jan 20 09:28:54 EST 2012 | dmiller
3-5% is extremely high. Think of that in terms of DPMO. 5% fallout would be a 50000 DPMO. That's not acceptable for most people.
Electronics Forum | Thu Jul 18 11:31:03 EDT 2002 | Mark S.
>But since we are a low volume high mix operation I need to account for almost every part used. I'm in the same boat, and we do more changing of feeders than actual placements it seems. What I have done which has improved things a lot is in our MRP
Electronics Forum | Mon Apr 28 11:52:28 EDT 2003 | hruiz
Thanks for your responses, as gregp says, one hour in changeover is not good when you run only 10 panels, we alredy do from 10 panels to 2500 boards per run, depends on the product, we already have a pre-kitted area mounted in their respective feeder
