Electronics Forum | Mon Sep 08 10:34:37 EDT 2008 | blnorman
Because of our high volume production, we use no clean flux. We have experienced leakage currents with leadless QFNs. One problem is the part isn't being utilized as it should, but another is the flux residue. There is ionic residue in no-clean fl
Electronics Forum | Tue Sep 16 11:42:35 EDT 2008 | slthomas
If support is a concern, don't forget that any support provided by equipment manufacturers will most likely (certainly with Juki and Universal) require registration of the machines at a cost to you of probably $2k-$5k per machine. Some used equipment
Electronics Forum | Tue Sep 16 16:30:49 EDT 2008 | ck_the_flip
Vlad, yes, he made no mention of a BGA, but I thought I'd just throw it in there. Many people are concerned with the "backward compatible" scenario - running RoHS parts with a Sn/Pb solder paste. The scenario's a no-brainer with most components, bu
Electronics Forum | Thu Sep 25 16:30:44 EDT 2008 | aj
Hi, I would be interested to hear the outcome of your trials! Although, if mechanical stress is of concern, I would look at what is causing the stress and tackle that. I would suspect that any stress great enough to fracture sAC305 joint would do t
Electronics Forum | Thu Oct 16 14:12:36 EDT 2008 | evtimov
Hi, I think the standard was IPC 6850. But I will recommend to go directly with the sigma test. Place parts with the machine and measure the placement accuracy on another machine. 4-5sigma at 50um should be a good machine. If they have sigma in thei
Electronics Forum | Tue Oct 14 11:53:09 EDT 2008 | slthomas
How much cost do you absorb in touchup and replacing missing parts, and how does it compare to the cost of operating a reflow oven that runs whenever you have product available to process? I don't necessarily have an answer for you but I'm having a
Electronics Forum | Tue Oct 14 21:16:26 EDT 2008 | mariss
The mounted panels (8" by 8") are stacked in carriers, 0.5" between panels, 20 panels per carrier. There are no missing parts or other damage due to carelessness. Anyone bumping a panel is summarily executed by the company firing squad. As someone
Electronics Forum | Thu Oct 23 21:15:15 EDT 2008 | ikonify
Has anyone been using the following documents for DPMO and any feedback on them? IPC-7912 - Calculation of DPMO & Manufacturing Indices for Printed Board Assemblies IPC-9261 (In-Process DPMO Estimated Yield for PWA) Also is there any databases rea
Electronics Forum | Sun Oct 26 12:06:09 EDT 2008 | pima
Hello I want to aks more experienced SMT engineers about one thing related with Fuji machines. Is it possible to protect some how to avoid populating pcb with component from different batch? We have one same part number same vendor but customer does
Electronics Forum | Tue Oct 28 13:00:56 EDT 2008 | exman
ax-5 having problem with pickup problem when the head placement try to pickup the component on the feeder the toolbit will fall off eventdo teach the part center very good but when they pickup it off about one inch happent on ly robot #1 the rest of
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