Electronics Forum | Wed Dec 20 21:01:12 EST 2000 | Dave F
Talk about glam jobs � About once a month, we�d go over to the slaughter yard to get cows� teeth for Dr. Mueller. Then we�d fixture them on their side and run them in a machine that scrubbed them with a brush for weeks. The cool thing about cows te
Electronics Forum | Tue Nov 21 22:15:59 EST 2000 | Vince Whipple
Mohammed, The first suggested place to start with your question would probably be with your flux Mfr. Push them! The quantity of dross is effected by several factors: The higher your solder pot temp., the higher your dross level... but don't go too
Electronics Forum | Mon Nov 06 12:01:47 EST 2000 | Chad Pawlak
Late last week 10% of the population of Thorp, WI lost their employment. Saputo Cheese of Montreal Canada, formerly Stella Foods and formerly Blue Moon Cheese announced it will shut the doors to this 70 year tradition on Jan 3. Leaving in its wak
Electronics Forum | Tue Nov 07 10:09:51 EST 2000 | Kevin
John, Depends on what you're cleaning (paste, adhesive, ink, etc..) and your process (do operators just dump a dirty stencil in and expect a clean one out, drying time, effect on the polyester). I could suggest a couple of name brand cleaners, but I
Electronics Forum | Thu Oct 26 08:59:56 EDT 2000 | Antonio A. Medina
Ok guys, I need help. Here's the deal. We're getting micro solder balls under discreets on the bottomside of the board. Here's my set up... MPM screener w/vacuum plate 6 mil metal screen with 90% circular (rounded) apertures 7 mil (measured) past
Electronics Forum | Wed Sep 20 19:34:13 EDT 2000 | Dave F
Congrats. You now control the source of almost 70% of the defects of your SMT operation. There is a neat series of presentations on printing, each year at SMI. One of the best of the SMI series was in 1997, because presenters used a common board
Electronics Forum | Tue Sep 12 11:55:30 EDT 2000 | Mike F
In general I agree with Dave and Chris, but some parts have leads that can't be clinched (connectors, some header sticks, etc.). If the problem part has not been a floater in the past, then check the lead finish and your flux application. A bad finis
Electronics Forum | Wed Aug 09 22:11:46 EDT 2000 | Dave F
Mark: The best routing of test vias for BGAs is to keep them far away from the device. We route test pads for the outer two rows of balls and use vias as test pads for the inner rows of balls. Your bottom-side layout is fine. Yes, on the top-side
Electronics Forum | Thu Jul 13 05:23:30 EDT 2000 | Donnie
There a few questions that I have for you. 1. What type of flux are you using? 2. What temps are your preheaters set at? 3. Can you possibly place them on after the wave? The reason I'm asking is that there may be some adjustments to the wave to bur
Electronics Forum | Sun May 21 05:54:04 EDT 2000 | Sal
Currently manufacturing double-sided PCMCIA cards with a nickel/gold finish, which are 0.0235thou in thickness, using surface mount carriers. Problem we are seeing is when building the densely populated side on the second pass we are seeing lifting o
