Electronics Forum | Fri Jan 21 05:39:58 EST 2000 | Scott Davies
Hi ZJJ, I know exactly where you're coming from on this one! We have a similar situation here with a SiPlace 80S-15, rated at 15K max per hour. In practice, we achieve about 11K. The reason is fairly straightforward. The quoted maximum placements pe
Electronics Forum | Fri Jan 14 16:58:20 EST 2000 | Dave F
Dave: You're probably correct about too much paste, given that your balling is congrigated near the center of the chips. Three things to consider: 1 Lower temperature profile @ front 3 zones 2 I've heard some stencil suppliers can plate addition
Electronics Forum | Fri Jan 14 17:24:08 EST 2000 | John Thorup
Yeah, it would be kind of expensive to replace all of your stencils but it's the only real answer. Be sure that all your new and replacement stencils have a home base or home plate shape for the passives. This reduces the paste volume near the cent
Electronics Forum | Thu Jan 13 13:16:40 EST 2000 | Dave F
Tony: You have choices: * Hi Temperature Tape: Go with Wolfgang ... too tough to control. * Selective Soldering Pallets: Some like 'em some don't. A lot of your success depends on the pallet fabricator. * Screenable Temporary Solder Mask: Wol
Electronics Forum | Wed Jan 05 11:01:37 EST 2000 | Ron Lahat
I have in design a 400mm x 400mm pcb 3.0 mm thick heavily populated with BGAs 50 mil pitch and want to run a double sided reflow process with overlapping BGAs (CS/PS) 1. can I avoid a selective jig for PS BGAs?(weight calculation ?) 2. Is it possibl
Electronics Forum | Wed Jan 05 11:43:11 EST 2000 | Dave F
Yins, In low volume applications, using X-ray for BGA mounting process control is: 1 Very expensive approach, as you've stated. 2 Requires beaucoup operator training and interpretation of results. Which is double bad, because of the intermittent n
Electronics Forum | Fri Jan 14 08:05:23 EST 2000 | Pat Pepper
Hi Dave, Thank you for the response. In answer to your responses I'll use the original numbers of my questions. 1. We would like to turn around our boards fast, but sometimes due to the market conditions we wind up with inventory. After reading
Electronics Forum | Wed Dec 22 05:42:19 EST 1999 | Wolfgang Busko
Hi John, I�ve seen problems some sites have or had with bridging problems in the wavesolder process with 1206 and 0805. Adjusting the system and focussing on the flux parameters sometimes improved things. With some older systems it was hard to get s
Electronics Forum | Mon Dec 20 08:26:17 EST 1999 | pascal MATHIEU
hello guys ; we are using some standard selective wave soldering unit used in lined ; the drawback of a such machine is 1/the speed which is quiet low (the board is coming on position through the conveyor, then the head delivering the solder moves s
Electronics Forum | Sun Dec 19 08:05:14 EST 1999 | Dave F
Clarissa: We've all done thing on a limited basis, especially on prototype boards, but this doesn't sound like a limited basis, or prototype boards. (And may be I reading too much into this, we all know the frailities of conversing like this.) Thi
