Electronics Forum | Thu Mar 11 07:50:13 EST 2010 | andras
Hello, many thanks for the valuable help. The guys at LPKF really helpful, and they send me the gerber immediatelly. Regards: Andras
Electronics Forum | Thu Feb 25 10:30:21 EST 2010 | davef
It sounds like your poly dots are secreting something that affects coating thickness. Is this a function of the adhesive used by poly dot supplier?
Electronics Forum | Fri Feb 26 10:34:03 EST 2010 | kpm135
If I had to guess I'd say they're using a silicone based adhesive.
Electronics Forum | Fri Feb 26 10:42:56 EST 2010 | mleber
Your masking dots are a silicone adhesive. Contact the supplier and tell them you need an acrylic adhesive on the same dots. Normally same cost and lead time.
Electronics Forum | Fri Feb 26 15:41:19 EST 2010 | kpm135
sorry jdumont I didn't see your post until after I posted mine for some reason. If I had seen it first I wouldn't have posted because yours covered it.
Electronics Forum | Mon Mar 01 09:17:56 EST 2010 | duso02
Hey....I think it might be the silicone adhesive! LOL Yeah, that'll do it. We use simple Shercon paper dots. Work like a charm. No evidence of "de-wetting".
Electronics Forum | Thu Feb 25 17:47:11 EST 2010 | davef
We agree with CL in the above posting. We talked about this previously here on SMTnet. Search the fine SMTnet Archives to find threads like: http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=28992
Electronics Forum | Mon Mar 01 09:36:29 EST 2010 | duanebrayton
Good morning Chris, We had discussed surface tension but were not sure if that alone would be enough, so I reduced the bottom side temperature in the oven by 20 degrees to see if that would help. I will be checking results this morning. Thanks f
Electronics Forum | Mon Mar 01 10:27:08 EST 2010 | wrongway
I don't think I would reduce the heat at all if there is no vibration in your oven or on the chain you should have no problem with them falling off or moving but you sure don't want a cold solder joint you no the solder joints are so easy to see go
Electronics Forum | Mon Mar 01 11:56:51 EST 2010 | pjc
Your IPC-610 workmanship manual will have the answer for you (I don't have the latest at my fingertips). Depends on what class you are building too, 1, 2 or 3 and the application of this connector on the product- which you must determine.
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