Electronics Forum | Mon Nov 13 14:58:56 EST 2017 | davef
Determine the origin of the solder * Sloppy paste printing technique * Lax stencil underside cleaning practices * Sloppy misprint cleaning practices * Poor part placement practices creating solder balls * Poor material control allowing solder p
Electronics Forum | Tue Jun 07 10:38:34 EDT 2011 | davef
Boots: Here's several methods for guessing at the amount of solder on your connection: * First, 'Down & Dirty' ** Assume that the solder is flat, which is reasonable since it's 'flattened' by the component package ** Assume 100% paste transfer from t
Electronics Forum | Fri Nov 03 14:02:35 EST 2006 | russ
The temp your iron is set at is somewhat irrelevant, it is the temp at the tip right? We use metcals and have 700 deg tips for leadfree. As you may know Metcal temp is at the tip and not a heating element seperate from the tip like many irons are.
Electronics Forum | Fri Sep 13 12:30:05 EDT 2002 | bobm
I have heard a lot of different stories about reusing solder paste. I take what is left on the screener at the end of the day (yes i try to watch the amounts that are put down)and transfer it to a clean solder paste jar. I would like to hear any inpu
Electronics Forum | Fri Jun 07 15:16:25 EDT 2002 | gdstanton
Ben, Get a copy of IPC 7525 and review it. This will help you understand the relationship of aperture geometry to paste transfer. Good Luck, Greg
Electronics Forum | Mon Dec 13 14:02:28 EST 2004 | DasonC
Question: If we run the same oven to run both lead free and lead paste. Will any lead contamination transfer to the lead free board by force conversion?
Electronics Forum | Thu Apr 06 13:33:10 EDT 2006 | marla
Hello Dougs: Have you tried stenciling solder paste to the BGA part itself. You will find this most helpful for your heat transfer and attachment integrity of the component in a Pb free process.
Electronics Forum | Mon Jul 24 08:30:25 EDT 2006 | nodlac
- Dirty stencil transfering paste from the stencil bottom. - Stencil opening (Pad Hole) to pad ratio incorrect - too large -misaligned stencil
Electronics Forum | Thu Aug 03 11:39:19 EDT 2006 | slthomas
Is your squeegee cleaning process adequate to guarantee no transfer of paste residue between jobs? Personally I wouldn't risk it, but then again it's easy for me to say since we don't do lead free.
Electronics Forum | Thu Jan 22 21:10:55 EST 2009 | fastek
If purchasing used is a consideration, I recall a fat registration fee upon ownership transfer with these units in the past. Not sure if that has changed much.
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