Electronics Forum | Mon Aug 27 12:31:04 EDT 2012 | rway
Its no my turn to give some advise. My first > question would be can you put the boards into a > carrier of some sort. There are many wonderful > companies that make carriers that are ment for > running down a smt line. This can be expensive > u
Electronics Forum | Mon Oct 28 18:59:25 EST 2002 | tkenny007
Specs for Bow and Twist for PCBs (IPC-A-610C, 10.6. There may be an update by now). I also have a note in our quality guide referencing (IPC-TM-650, 2.4.22) and (MIL-STD-105D). In summary, a PCB should not bow more than 0.040" with all four corner
Electronics Forum | Fri Jul 09 06:51:46 EDT 2010 | cobar
Try titanium edge stiffners on the PCB before making solder pallets.
Electronics Forum | Fri Jun 25 22:30:47 EDT 2010 | smthexi
i think you need to use a PCB central support. do you know that part ? it specializes in preventing PCB board from bowing during wave soldering.
Electronics Forum | Thu Jun 24 15:33:56 EDT 2010 | davef
Our best suggestion - get the copper balanced and if possible go to higher Tg materials.
Electronics Forum | Tue Jun 29 00:23:11 EDT 2010 | dontfeedphils
Is this a single PCB or a multi-up array? At the very least you should probably pick up a universal wave pallet, check out AGI or DMI. -Phil
Electronics Forum | Tue Jul 20 16:02:12 EDT 2010 | mikesewell
You may want to look at IPC 7721 Method 3.2 Bow and Twist Repair. In extreme cases you may need clamp or weight the pcb with bow in the other direction to yield a "flat" pcb in the unrestrained state. You will have to take the PCB up to or slightly
Electronics Forum | Fri Jun 25 13:56:01 EDT 2010 | tate350
Consider using wavesolder pallets that keep the board flat during wave. Keep the board in the pallet after wave until it cools down a bit then remove it.
Electronics Forum | Thu Jul 01 11:48:10 EDT 2010 | mb_mfg
Sid, Try baking the boards before running, to insure no moisture. Baking out the moisture will help prevent warping. Should you need further assistance, we supply fixtures to force the board to stay flat to reduce to thermo shock during wave solde
Electronics Forum | Fri Jun 25 15:04:39 EDT 2010 | siddharth
Thanks for you suggestions, guys. davef, I am gonna get with my PCB suppliers and talk to them about copper balancing and checking the Tg of the materials they use. SC, I am working towards designing wave pallets for my boards and try your suggesti
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