Electronics Forum: balanced (Page 12 of 41)

Reflow

Electronics Forum | Mon Oct 09 13:41:20 EDT 2017 | dleeper

developing a reflow profile is about balancing two variables, time and temperature. If its too hot, you damage parts, if its too cold, the solder won't melt. If the belt speed (time) is to rapid your temperatures will ramp to fast, if its too slow, y

Best practice to validate the old - more than 5 year old parts

Electronics Forum | Tue Dec 17 05:58:36 EST 2019 | robl

We had a customer who used XRF to determine the thickness of the "tinned" layer of components - sort of what is briefly mentioned in Bob Klenke's SMTA paper - http://www.circuitinsight.com/pdf/Solderability_Testing_Protocols_Component_Re-Tinning_Me

Question for everyone regarding part placement on the SMT line (feeder position)

Electronics Forum | Wed Jan 29 07:10:19 EST 2020 | dontfeedphils

I'd recommend checking with the manufacturer of your SMT equipment and checking into the feeder verification solutions they have. Combine that with a buddy check and true first articles before the line can continue to run the balance of the job an

solution to design challenge (ubga, NSMD pads, heavy traces)

Electronics Forum | Tue Mar 24 10:34:03 EDT 2020 | slthomas

My experience with our process is that those parameters would result in a big bridging problem. I'm working with a stencil designer at our fabricator on an asymmetrical aperture design that hopefully balances forces enough to keep the parts centered.

Re: your , please

Electronics Forum | Thu Feb 17 21:45:26 EST 2000 | Dave F

Steve: Wadja mean "I fixed it, now tell me what I did to fix it." Steve, you�re one scary guy. ;-) "Steve�s Longer Pad Theory" - Stubby pads will not make solder flow-up the leads of a QFP100, leaving sparse solder on the pads. Given a choice, s

Re: your , please

Electronics Forum | Thu Feb 17 21:45:26 EST 2000 | Dave F

Steve: Wadja mean "I fixed it, now tell me what I did to fix it." Steve, you�re one scary guy. ;-) "Steve�s Longer Pad Theory" - Stubby pads will not make solder flow-up the leads of a QFP100, leaving sparse solder on the pads. Given a choice, s

Spacing and Yield

Electronics Forum | Tue Sep 18 11:34:36 EDT 2001 | jschake

The tightest spacing between neighboring 0201 components assembled was 8-mils. Please refer to the response for the query entitled �Minimizing Tombstoning Defects� posted by martys, as the response provided there is also relevant to address this que

Slide line operation

Electronics Forum | Tue Jan 08 22:48:58 EST 2008 | davef

Maybe these folk can help you with your MTM issues. http://www.mtm.org We appreciate the desire to balance the line with respect to standard insertion time, number of insertions, and number of assemblers. In reality there are too many variables fo

Re: Chip on board - board metalization

Electronics Forum | Mon Jan 08 20:26:12 EST 2001 | Dave F

Ask your supplier if he will guarantee to cover rework, warranty, and lost business costs, if he's incorrect. Below 2uinch gold is very pourous and not worth anything in preventing corrosion of your nickel undercoat. 3 uinch has to be the absolute

Re: Wave-Solder LCDs ???

Electronics Forum | Fri Oct 20 13:57:35 EDT 2000 | Greg Amero

Most LCD manuf. specify not to wave or reflow. I believe this is because of the prolonged exposure to the preheat temp. However, about three years ago, we were running about 350/wk of a 40P DIP LCD through the wave with no fallout. It did stress t


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