Electronics Forum: because (Page 220 of 444)

Re: solder joint problem?

Electronics Forum | Mon Jun 12 22:00:51 EDT 2000 | Dave F

Could be. What are your profiles? 2) Au finish fail => Could be, but that the connections can be made with hand soldering makes this a low probability cause, assuming the activity of the flux used in hand soldering is not significantly different fr

Re: Dbl-Sided Reflow Question

Electronics Forum | Mon Jun 05 14:10:54 EDT 2000 | C.K.

Dave: Thanks for you Earl-Moonesqe explanations. To answer your 3 questions below: * If there�s no flux in the via, why does the sodder flow? I thought it was the flux that removed corrosion to increase wetting that allowed

Re: SMT assembly on Punch/return boards

Electronics Forum | Fri May 19 10:39:19 EDT 2000 | Boca

Ed, I workded with punch and replace fabs yeeeeears ago, major pain! Dave's right, planarity is the biggest problem, then inconsistent retention in the panel, then ANY retention in the panel. If you can get paste on them, you may be able to place

Re: SMT assembly on Punch/return boards

Electronics Forum | Fri May 19 10:41:06 EDT 2000 | Boca

Ed, I workded with punch and replace fabs yeeeeears ago, major pain! Dave's right, planarity is the biggest problem, then inconsistent retention in the panel, then ANY retention in the panel. If you can get paste on them, you may be able to place

Re: Operating a SMT system

Electronics Forum | Thu May 18 03:13:13 EDT 2000 | Earl Moon

Bait, my ass. Something so thinly vailed is what I'm talking about on this forum. However, Janet is a prime example of someone needing help and you folks kindly offered with good advice. How could you not give good advice to someone needing everythin

Re: Dusted By Dross

Electronics Forum | Wed May 17 10:19:25 EDT 2000 | C.K.

Hey Dave: At our facility, we use those masks that filter out particulates. Our safety department requires all wave operators, maintenance, and even wave process engr's (like me) to have these masks checked every 6 months for proper gasketing, filte

Re: Where's Earl Moon ?

Electronics Forum | Tue May 16 20:32:52 EDT 2000 | Dave F

YES!!!!! We have a winner, ladies and gentlemens. The prize is a round of drinks for you and the grrrrrls. Bud, you have got to be a bit teched to dig-up that obscure reference. Hello, teenage America, My name is Suzy Creemcheese, I'm Suzy Creemc

Re: Vectra Wave

Electronics Forum | Fri May 05 14:30:11 EDT 2000 | C.K.

I'd have to disagree with the Electrovert applications guy. I'd recommend SLOWING down the conveyor between .5 to 1 FPM - effectively, you're REDUCING contact length (because contact length = dwell time * conveyor speed), hence getting better peel-o

reports on answers to threads

Electronics Forum | Tue May 02 14:18:50 EDT 2000 | Erhard Hofmann

I think it is very nice to have the feature of getting informed when someone answers to a question I put on the smt.net. But (and that's a big but): If you send out an email why can't you just include all the informations you want to send in the emai

Re: stencil epoxy debonding

Electronics Forum | Tue May 02 14:19:26 EDT 2000 | Bill Schreiber

There are two primary causes of epoxy adhesive bond failure, heat and over exposure to moisture. Ultrasonic cavitation is a only a mechanical "scrubbing" action on a microscopic level. However, if the adhesive bond is week or has small areas of det


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