Electronics Forum | Wed Dec 19 21:21:02 EST 2012 | davef
MosheSh: When it comes to ground planes, most designers are out over their skis. They don't understand what's going on or how it affects their design. So, they get massively conservative about the number of plane layers, whether they can be hatched o
Electronics Forum | Mon May 21 15:39:49 EDT 2012 | davef
This paper seems to take a balanced view as an approach to assessing xray machines http://www.focalspot.com/swf/WP-Price-Performance-Value.swf Let us add to this by saying, we don't work for the company referenced above, don't own stock in the comp
Electronics Forum | Mon Jun 04 10:40:37 EDT 2012 | davef
I'm not aware of any such stipulation about witness [probe] marks for assembled boards, per se. Certainly, witness marks should not affect the intended performance of the assembly, you know, like damaging the solder connection or smudging solder mate
Electronics Forum | Mon Jun 04 23:52:57 EDT 2012 | rway
Actually, if you experience lack of witness marks, you probably have a problem. Witness marks are OK and will not affect your assembly. I assume this is an SMT assembly we are talking about, in which case, this is what your test pads are for. You
Electronics Forum | Mon Jun 04 18:06:01 EDT 2012 | swag
Once a day is excellent QA but my experience has been that it's overkill. We check various products at the start of the run - it amounts to a couple of times per month at most. Over the years, I have not seen any problems with the ovens. The only
Electronics Forum | Wed Jun 27 03:43:24 EDT 2012 | allgood
Very interesting - esp that you have removed the temperature variable by being airconditioned. We defeinitely do not get strikes at 74 but do at 80 - but also we dont start the machine when its 80, that is the afternoon tempertaure on a rare hot day
Electronics Forum | Wed Jun 27 11:58:42 EDT 2012 | cyber_wolf
Your tool tips are being damaged because the small x-motor is not engaging when the head is picking parts. When this happens the head overshoots and you bang the tips on the mag springs. Directly after a tip gets damaged go into the service program a
Electronics Forum | Mon Jun 18 07:07:35 EDT 2012 | buckcho
Thank you for the response, but the machine selection is not made by me, I only evaluate the machines. So two days ago I visited a company that has a Viscom AOI. I had good impressions about the machine but there were couple of things I didn't like:
Electronics Forum | Thu Jun 14 00:10:18 EDT 2012 | tech1
Most of it depends upon the type of Y wagon you have. if they are internal conveyors you need to remove the covers from the operator side. There are 3 screws holding the Y wagon down, 2 of them are hex screws and the one in front is an allen head. W
Electronics Forum | Mon Jun 11 17:14:13 EDT 2012 | mmjm_1099
1st Question I am working on ROI for a bare board destacker and wondering if anyone has a general guideline to follow. Example of ROI for bare board destacker I have now as follows: $7500 for destacker, Avg panel input 3365, Time to load in panel 7
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