Electronics Forum | Wed Jan 05 18:34:06 EST 2005 | russ
From what I have read so far the temps are, if not close to being the same for both alloy formulas. Preheat is a function of flux activation and thermal shock. Solder temp varies from place to place. Russ
Electronics Forum | Wed Jan 12 17:47:13 EST 2005 | Dreamsniper
I wanna make a MSExcel spreadsheet that will automatically convert Percent Area of a BGA void to Percent Diameter. What is the formula? Thanks and regards,
Electronics Forum | Thu Apr 28 08:46:54 EDT 2005 | jdengler
Do you run 24 hrs a day 365 days a year? Do you have 100% utilization? If no to either or both questions you need a differant formula.
Electronics Forum | Wed Nov 01 18:20:21 EST 2006 | russ
Flux is fine, make sure you have one that will withstand the extended and hotter reflow for the Lead free, your paste MFGR will most likely have the flux formula in their paste available as a tacky or paste flux Russ
Electronics Forum | Tue Nov 28 09:21:58 EST 2006 | Michael Sanders
Is anyone aware of any articles, white papers, etc., that discuss the gap between the lead and the pad after a SM joint is soldered? In particular, I am looking for a formula for that "gap" for various components.
Electronics Forum | Mon May 07 07:58:29 EDT 2007 | ck_the_flip
A homegrown spreadsheet with all the formulas is the way to go. You must OVER-INFLATE your labor rates too. At my last place of employment, I'd come up with "sound engineering numbers" only to be forced to over-inflate them by the factory manager
Electronics Forum | Mon Jul 07 17:25:04 EDT 2008 | thughes
I'm curious to know what the pitch of the outer pads is/was on your device. Also, is this a general formula you use on all of your QFN devices or was this for one specific device?
Electronics Forum | Mon Dec 17 12:15:10 EST 2007 | Claude_Couture
What a coincidence! Our last solder analysis showed our Ge to be .001% and the lab recommended to bring it up to .005% to get a better wetting. They even supplied a formula to calculate the amount to add based on the % and the quantity of solder in t
Electronics Forum | Fri Jan 25 15:47:35 EST 2008 | Hman
Best to throw an amp clamp on it at diffrent times and then average it out with the formula they gave you!
Electronics Forum | Mon May 05 15:52:22 EDT 2008 | dekhead
Assuming you have the scale that corresponds with Board Width for center justified stencil. Formula would be: 2 x (distance to image {mm} - 368) = Board Width (setting on scale) http://www.dekhead.com/
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