Electronics Forum | Thu Apr 24 20:52:03 EDT 2008 | davef
Use of a hot air gun to reflow solder that passes tests [after failing those tests] seems to indicate the standard process reflow was inadequate. To understand this better, we'd want to measure temperatures at various points on the board during reflo
Electronics Forum | Wed Jun 18 08:51:34 EDT 2008 | ldavis
We actually found the opposite to be true. Boards processed in VP are much cleaner than those processed in our air-only convection oven. We tested 5 lead free solder pastes upon implementation and found that the type of paste does affect the number
Electronics Forum | Thu Sep 11 11:47:15 EDT 2008 | jeffcali
Depending on the assembly, I have applied balls on LGA's and reflowed them on using the rework hot air machine. Some places don't have the money to spend on mini micro stencils of all types, and thus spend the money on various sizes of solder balls
Electronics Forum | Tue Aug 26 07:44:06 EDT 2008 | davef
Industry-wide, there is no current requirement for baking of bare boards. It adds no value. * IPC-HDBK-001 has guidelines olden times. * IPC-TM-650 has several test methods to determine moisture resistance to both liquid immersion and absorption from
Electronics Forum | Fri Sep 12 08:22:31 EDT 2008 | davef
Your supplier is probably the best source of advice on this issue. Some offer tips like: http://www.n0ss.net/hakko_808_notes.pdf Depending on the design, some use grease to reduce air leakage on: * Filter tubes * Gaskets or O-rings * Threads We ha
Electronics Forum | Tue Sep 16 17:56:36 EDT 2008 | slthomas
"....over 3500 apertures in a circuit that is about 1 x 1.5 inches..." 8O Yeah, Larry would definitely be the go-to on this one. :P I would think reducing stencil thickness would be your best bet to avoid that ratio problem, but how durable is a .
Electronics Forum | Tue Sep 23 13:00:28 EDT 2008 | mikesewell
I installed an On Site unit for our SS machine. You'll need to size it in terms of flow rate to your equipment (possibly put a reservoir tank in) and decide on what purity level is required. Maintenance was very minimal. Just remember to factor it
Electronics Forum | Thu Oct 02 15:09:32 EDT 2008 | ck_the_flip
Jani, I got it from a very vague spec. from a solder paste supplier who stated, "It is not advisable to refrigerate an already opened container." Sorry, but I don't have details why. My guess is, several temperature excursions, after the air-tigh
Electronics Forum | Thu Oct 02 19:45:48 EDT 2008 | hegemon
There was a company called APE that made a forced air convection machine called a ChipMaster. Around $4k Bulletproof and simple. Will work for years and years, and is particularly well suited to QFP rework. Used to have a dozen or so working on ju
Electronics Forum | Wed Oct 15 11:29:58 EDT 2008 | dphilbrick
You have a lot more problems than what you are asking about. If you are running a shop that is un-air conditioned and high humidity you will have nothing but trouble in ALL aspects of your operation. I know this is harsh but I am really surprised in