Electronics Forum | Fri Sep 10 17:32:59 EDT 2004 | Yngwie
We have recently faced lifted lead problem that happened on our 20 mil pitch QFP. We have infact pushed it back to the incoming quality, but still I have a few questions to bring up : 1) what is the typical coplanarity tolerance that ICs' manufactur
Electronics Forum | Tue Feb 13 11:20:59 EST 2007 | cevans MPM printer specialist
Off contact is generaly less favourable than on contact printing. print height becomes a issue towards the edge or foil clamps. If you Had little or no issues with your previous board vendor re-check your specs you supplied to your current vendor. If
Electronics Forum | Tue Aug 14 10:53:15 EDT 2007 | rgduval
Should be do-able. Check out a couple of things: 1. Temperature tolerance of the LED's. If they can't withstand reflow, then you won't be able to do it. 2. Height of the LED's versus the travel of your pick/place. If your pick/place head won't t
Electronics Forum | Wed Apr 04 09:20:20 EDT 2012 | acsscott
I have continued to try and make this work, but I've had no success. I have tried everything that everyone has suggested. It might be the component height, but I can't change that. I guess I could increase the resistor thinkness, and add some heig
Electronics Forum | Wed Feb 08 12:18:18 EST 2017 | dyoungquist
It could be a part height issue. I have seen a case where an 0402 resistor from 2 different manufactures had different heights. If the height of your 2010 part is taller than you have programmed in the package data, the pick up head may be pushing
Electronics Forum | Tue Jun 18 09:51:53 EDT 2013 | rway
If they're 1 1/2 years old, they are definitely aged parts. Either send them back for newer or widen your tolerances on the ICT to compensate. You are at the 3rd decade now (10,000 hours) and you will need to compensate for this. These parts are n
Electronics Forum | Mon Nov 16 01:35:15 EST 2009 | chandika
for reject rate depends on various parameters, Part data parameters, (Body tolerance,Part pickup & transport speed etc. ) Also depend on vaccum level, ( During the PM we need to messure pickup nozzle vaccumlevel using manometer ) According to raw mat
Electronics Forum | Tue Nov 30 14:47:34 EST 1999 | EmJay
Larry, TRy using #254 and front light the part. When you define the leads leave plenty of tolerance and use a P-Pattern of 34.
Electronics Forum | Thu Aug 05 17:21:48 EDT 2004 | russ
A stackup is basically this, if all parts (mating) are at the high end or low end of tolerances will they still fit together or meet any dimensional requirements as an assembly.
Electronics Forum | Thu Apr 05 12:48:08 EDT 2018 | cyber_wolf
In my experience Chinese aftermarket parts for Juki's are substandard. They are very good at making things look the same but the materials and tolerances are unacceptable.
