Electronics Forum | Thu Aug 14 17:29:15 EDT 2003 | Andrea
We use these but we hand solder. The resistor is basically a wire inside the encapsulant. When we noticed the bowing, we tested about 200 that were on different CCA's. They were all fine. If they want to use these under the wave solder, be sure to lo
Electronics Forum | Fri Feb 13 17:55:49 EST 2004 | Dale Freeman
I populate several thin panels (0.032")using a Samsung S-2000 P-N-P machine. With panel sizes of 8" by 10", it is very difficult to clamp the panels into the machine with deflection and bowing. Also, the Samsung makes it very difficult to adjust the
Electronics Forum | Fri May 07 20:08:39 EDT 2004 | Ken
...um also, don't forget that ther are planarity issues associated with BGA devices AND bow-and-twist issues with PCB materials. An example I have one BGA device that has a ball planarity of 7 mils!!! Ant that's the OEM specification! THis will re
Electronics Forum | Thu Feb 17 14:39:39 EST 2005 | JB
We have PCB's that have been poorly designed and do not have enough support. A quick fix, so they don't bow in the oven, is to set them on a stronger frame, before reflow, from a panel that has been singulated. Single or double sided? Hope I inte
Electronics Forum | Tue Mar 22 12:04:31 EST 2005 | John S
Thanks for the advice. In this scenario we are designing our own product. Currently we are building at a prototype level with no appreciable wait between reflow passes. The part in question is a 64 pin QFP. We use a BTU VIP 98 with edge conveyor.
Electronics Forum | Thu Apr 07 10:58:01 EDT 2005 | Dhanish
Need help from the experts on 1)simple way to measure the PCB warpage 2)what is the maximum warpage can the SMT machine allow the to accept and place the component without problem. 3)I have seen some people are using 7mils/inch as a Warpage spec. a
Electronics Forum | Mon Oct 03 19:15:32 EDT 2005 | cn
is this a single brd or multi up array? What is the thickness? where were the brds made, state/country? I had an issues with a brd which was fabed in mexico during the humid months there was mosture trapped in the brds which caused many strang things
Electronics Forum | Tue Feb 28 12:34:12 EST 2006 | pr
Gel flex is crap! If you put enough in to actually support the board, it bows. Apparently MPM knows this because they include hard pins with the set (kinda defeats the purpose huh)! I trialed the grid-lok and it worked fine and operators loved it. Th
Electronics Forum | Wed Apr 26 11:24:10 EDT 2006 | russ
I sure haven't JEM. Was just trying to help determine how to justify. Funny things about those claims like barcode scan, yes they help but now you need a pronter to print barcodes, an operator to put them on, etc... So is it a help? just an exampl
Electronics Forum | Tue May 06 15:32:48 EDT 2008 | realchunks
IF and only IF you are on a solid flooring. We have ESD carpet. If you were to apply RTV to the carpet, you'd be walked out and thrown on your skinny a$$. Also, extruded aluminium conveyors will bow before skidding, thus causing alignment problems
