Electronics Forum | Wed Aug 11 18:35:17 EDT 2010 | julie1
Anyone work with or have knowledge about metal core/clad boards? The board I'm working with is approximately 2" X 3/4" aluminum core pcb, in a 56 up array. There are 3 LED placements per board. I'm having trouble getting a consistent screen print.
Electronics Forum | Wed Oct 30 01:23:19 EST 2002 | jasper
Normally warp max 1% of diagonal board measurement is acceptable. What's your p&p like? Some will not experience problems at all! reg Jasper
Electronics Forum | Wed Oct 30 01:23:22 EST 2002 | jasper
It has been my experience that when all > conditions are as they are supposed to be there > should be zero or very little deflection. When > you start placing components with pick and place > equipment that does not have a Z pressure sense, > yo
Electronics Forum | Thu Oct 11 22:25:50 EDT 2001 | davef
Bruce I�m with yall. Designers and fabricators say �pins�. You say: * BGA pins are 1mm [0.039�] pitch. * BGA pads are 0.4mm [0.0157�] diameter. * BGA pins are 0.6 mm [0.024�] side-to-side. * Board thickness is ~0.4 mm [0.015�] First, as you can
Electronics Forum | Fri Jul 16 08:14:15 EDT 2010 | vetteboy86
We're expereincing issues in our pick and place machine due to what I consider a server warping of the PCB. The PCB is received this way from our PCB manufacturer. Before I push to much, I would like to know options for a cause. The warp is so bad,
Electronics Forum | Tue Jun 25 01:01:15 EDT 2002 | ianchan
Hi mates, has anyone ever done a DoE on the degree of warp PCB, after a SMT Reflow process? what were the findings and conclusion based on such a DoE? which were the critical (DoE) factors that influence the degree of warp PCB? any optimal reflow se
Electronics Forum | Mon Jul 01 02:42:32 EDT 2002 | ianchan
Daan: thanks for the tip.
Electronics Forum | Mon Jul 01 13:08:21 EDT 2002 | peterson
What is Tg?
Electronics Forum | Mon Jul 01 18:30:58 EDT 2002 | mcox
Remember! Empirical data will allow you to take advantage of the inherent continuity of quantitative variables.
Electronics Forum | Wed Jul 21 12:19:01 EDT 2010 | mb_mfg
To eliminate warping during processing, we have provided customers with composite fixtures to support the board on all 4 edges, with retractable pull down claps that can be added to the top of the PCB after the screen printing. Simply by pushing the
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