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
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
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
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.
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
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
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
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
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
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
