Electronics Forum: warped pcb (Page 1 of 19)

Screen printing warped boards

Electronics Forum | Mon Apr 24 09:43:47 EDT 2006 | printerman

What you describe is the X snuggers fitted into the workholder which do need either a flat board or good vacuum to work. There are several solutions. One solution you can try yourself is to use Vacuum cups, ( bellows type) designed into the workholde

metal core/clad pcb

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.

pcb board deflection when mounting component

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

pcb board deflection when mounting component

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

672 PBGA on PC Card .015 thick pcb

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

Warping PCB's

Electronics Forum | Thu Dec 01 07:41:38 EST 2005 | imachin

Thanks This has helped.

DoE on post-reflow PCB - warp

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

Warping PCB's

Electronics Forum | Wed Nov 30 05:12:53 EST 2005 | imachin

We have recently experienced problems with quite severe warping on a PCB after reflow by our PCB subcontractor. Any advice would be much appreciated!

PCB Warp Issues

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,

Warping PCB's

Electronics Forum | Wed Nov 30 07:50:28 EST 2005 | davef

Search the fine SMTnet Archives while you're waiting for others to reply. For instance a recent thread is: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=36912

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