Electronics Forum | Thu Apr 19 10:59:05 EDT 2007 | peteb
Greetings, Is there a Mil Spec or IPC spec on how many times you can wave solder a PCB? I did a search on this forum with no results. Common sense says two or three times. I need documentation.Thanks for any info.
Electronics Forum | Sat Apr 28 10:04:09 EDT 2007 | SMT GUY
Now I know why BTU's sales for Qtr.1 2007 were only 15 mil.
Electronics Forum | Thu Jun 21 07:21:26 EDT 2007 | chrispy1963
5 mil is perfect for 0402's. If you are printing SnPb solder use apeture reduction such as home plating the pads. However, if youre using SAC, we've found that printing the entire pad works best due to poor wetting compared to SnPb paste. Chris
Electronics Forum | Fri Jun 22 10:56:07 EDT 2007 | ed_faranda
5mil works great. Just make sure that you screen alignment is dead on. We're using a SAC305 with a home plate design. I ran a test a couple of months back and found that the home plate design works the best with 0402s.
Electronics Forum | Wed Jun 27 21:16:20 EDT 2007 | rfrog
5 mil will treat you just fine. Do some research on stencil area ratio and aspect ratio if you ever reduce your aperture sizes any further.
Electronics Forum | Tue Aug 21 14:37:23 EDT 2007 | jseagle
We went with a DEK ELA automated printer and have never been happier. We print down to 16mil (.4mm) with great results. I know this may be beyond your budget but just look for a printer that raises straight off the board with no hinge. James
Electronics Forum | Wed Oct 24 12:34:49 EDT 2007 | resource
You could have look at LASER QUADRA Pick & Place Machine manufactured by TWS Automation, Italy (www.tws-automation.com). Its a small foot print, 3000CPH, 0402 capable, 20mil capable, BGA capable, machine with motorized feeders . Dispenser is an optio
Electronics Forum | Fri Oct 26 18:30:29 EDT 2007 | jmann30
Check at model MC-384 from Manncorp This model sells for under $50,000 including feeders, Cognex Flying Vision and bottom vision to handle everything from 0201 thru 12 mil pitch QFP and BGA`s
Electronics Forum | Thu Nov 01 10:09:18 EDT 2007 | slthomas
Lke Pete C said it's specified by the manufacturer of the paste, but it's also board specific. We print a lot faster on boards with nothing smaller than 50 mil pitch than we would on 16.
Electronics Forum | Mon Nov 05 18:31:34 EST 2007 | bandjwet
What methods are being used in industry successfully to reball smaller pitched devices (0.5mm pitch, 12 mil balls and below)? Regards BWET
