Electronics Forum | Mon Mar 13 15:35:32 EST 2000 | Ioan
Stu, it is good you know that there are limitations and you want everything. Wish our designers work like that. So, the limitations we impose are dictated by the rails of the insertion and dispensing machines. Normally a .150" keepout will make a s
Electronics Forum | Thu Mar 20 23:01:40 EDT 2008 | davef
Boardhouse: Not to be confruntational, just trying to better understand what you're telling us. When you say, "Standard spacing most board houses would like to see is" blablabla. * What are the units of these dimensions? * You'd like to see these dim
Electronics Forum | Wed Apr 09 14:50:03 EDT 2008 | bradlanger
We use a FKN pizza cutter and found that even with 5mm clearance and the proper orientation of the part larger ceramic capacitors 1812, 1210 would still stress fracture. We have successfully fixed stress fracture problems by adding routed relief slot
Electronics Forum | Tue Mar 14 21:22:41 EST 2000 | Dave F
Bingo!!! By panelizing and adding breakaway rails (as Nancy says), Stuart can pour copper up to his board fab's tolerance from the board edge. Traditionally, he just wants to make sure no copper shows on the edge of the board. Then again, it's his
Electronics Forum | Tue Mar 14 21:22:41 EST 2000 | Dave F
Bingo!!! By panelizing and adding breakaway rails (as Nancy says), Stuart can pour copper up to his board fab's tolerance from the board edge. Traditionally, he just wants to make sure no copper shows on the edge of the board. Then again, it's his
Electronics Forum | Tue Mar 25 14:05:16 EDT 2008 | flipit
X7R >Z5U,Y5V. Y5Vs crack more than NPOs. Ceramic resonators crack often as well. I found that the chop style like the Fancord VPD5 is the lease stressful of the V-Score cutters. We have run as close as 0.025" to the edges with 0805s with no crack
Electronics Forum | Fri Aug 17 08:37:47 EDT 2001 | jbieber
Gregory, I think that the profile is too radical, i.e. zone 6 to zone 7 temperatures are too far apart. I would guess that the solderjoints have not all reached 183C in zone 6 which is why the uBGA's do not have a symmetrical ball collapse. You may
Electronics Forum | Thu Mar 20 17:39:41 EDT 2008 | boardhouse
FSW, Another suggestions is if you have rail on your product and you are concerned about stress fracturing certain components you could add a routed slot to add relief in that area. So when you snap the rail off their would be no stress in that area
Electronics Forum | Thu Mar 23 14:17:47 EST 2000 | Finepitch Services
Stuart, My suggestion is a DFM meeting (most of the process people dream about a meeting like this, and luckily, I've been to a few) with: - project manager (if there's one) - customer service rep (annual volume, lot size, product life) - smt proce
Electronics Forum | Thu Mar 23 14:17:47 EST 2000 | Finepitch Services
Stuart, My suggestion is a DFM meeting (most of the process people dream about a meeting like this, and luckily, I've been to a few) with: - project manager (if there's one) - customer service rep (annual volume, lot size, product life) - smt proce
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