Electronics Forum | Wed Jul 03 14:08:10 EDT 2002 | gbriceno
I' designing a PCB with SMD components to optimize the land patterns for wave soldering. I find that the IPC-SM-782 land patterns are not robust enough for wave soldering, yielding ramdom skips and bridges. This PCB will also give me insight on sha
Electronics Forum | Wed Jul 03 15:58:16 EDT 2002 | davef
Your thinking is correct. Wave soldering pads that were designed for reflow can create problems: * Large pads used for reflow [too much solder] can create reliability problems. * Bridging [too much solder] creates rework. * Skipping & shadowing from
Electronics Forum | Tue Mar 18 12:38:39 EDT 2008 | fsw
Hi! Can anyone tell me what is the min spacing between PCB edge & land pattern to avoid cracking of components due to mechanical stresses caused while depaneling with cookie/pizza cutter. Thnx!
Electronics Forum | Thu Mar 20 16:53:32 EDT 2008 | guhansub
Min spacing will be 0.75'' on all the 4 edges
Electronics Forum | Tue Mar 25 03:28:12 EDT 2008 | lococost
Thanks Steve, that's very clear!
Electronics Forum | Wed Mar 19 09:54:44 EDT 2008 | davef
Here's what we suggest: * Keep a 5-mm space between a board edge and a ceramic capacitor. * Mount the capacitor parallel relative to the edge. * Design pads about a half of the termination. * Fixture the board when using your pizza cutter.
Electronics Forum | Thu Mar 20 10:59:59 EDT 2008 | fsw
Thnx Dave! I have not seen anyone as yet using fixtures to support brds while using Pizza cutters. Will check it out.
Electronics Forum | Fri Mar 21 08:28:35 EDT 2008 | lococost
Boardhouse, would it be possible to attach a picture of such a routed slot together with a V cut? I was always told the 2 don't work together that well because of tolerances.
Electronics Forum | Mon Mar 24 12:11:38 EDT 2008 | scombs
Is this what you are looking for? We do this on quite a few boards and it has eliminated component problems from the Cab depaneler (pizza cutter)
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