Electronics Forum: middle (Page 10 of 49)

How long can you leave paste - update

Electronics Forum | Wed Apr 04 03:38:04 EDT 2007 | chrissieneale

The two machines in the middle are really really old m/c's so we try as much as possible to not to use them (apart from as very expensive conveyor belts). They run a fixed set up as although we have a bunch of different products they all tend to use

Wire prep

Electronics Forum | Mon Aug 27 12:42:47 EDT 2007 | rgduval

I know this is a little outside of SMT production, but, I'm hoping someone out there can help me with a small issue. I have a product that I'm building that requires 4 .250" wires, with .125" strip on each end. I solder one end to the board, and on

Unusual board with BGA

Electronics Forum | Wed Dec 12 12:08:30 EST 2007 | realchunks

Yes, you can ask for scrap boards, buy Dummy boards/parts or engineer off past runs. For this cost, I would profile, profile, profile. I would make/buy a dummy board. If you don't have one this thick, glue/ adhesive/ bolt some scrap boards togeth

American RoHS

Electronics Forum | Sat Jun 06 15:54:36 EDT 2009 | dilogic

A view from my perspective - EU is becoming over-bureauocrated mastodont (e.g. now they have 23 OFFICIAL languages - meaning each document HAS to be translated to ALL of them), resulting in such idiotic laws as that RoHS initiative. It's similar to c

Slow day at the 'net

Electronics Forum | Tue Dec 19 19:11:37 EST 2000 | Michael Parker

Not much activity here in the past few days. Just wondering if you all have been egg nogging it too much in preparation for jolly ol' St. Nick. Or could it be that some have taken to smoking the mistletoe? I hope DaveF. has recovered OK from his re

Re: Desperately looking for help

Electronics Forum | Wed Dec 13 20:39:04 EST 2000 | Dave F

Hello Dr. Fuzz, this is Dave. I'm right in the middle of giving myself an appendectomy and could use your advice on some of the finer points. Let's see, I've made a lateral cut across my stomach and for the life of me [heh heh] can't remember if th

Re: Measuring Board Deflection

Electronics Forum | Fri Jul 21 15:26:59 EDT 2000 | Boca

You're going in the direction of fab improvement, a great direction. But in another direction; If you're already in a carrier, how about using a skyhook of some sort to support the middle of the fab from the top side? In some cases you can put fine

Trouble reworking Xilinx 4044XL BGA chip

Electronics Forum | Wed Jan 17 20:33:19 EST 2001 | davef

The corner balls are supposed to collapse, but at roughly the same time as the other balls collapse. Also, those balls are located in the place that isthe easiest to get hot. Think about cranking-up the bottom heat, waiting, and slowing down the pr

Effective Alternatives To Stencil Cleaning

Electronics Forum | Mon Feb 19 18:48:59 EST 2001 | davef

For smaller companies, it is difficult to justify the ~$35k cost of products in the class that you sell. On the other side of things, sloshing boards and stencils in a plastic wash pan containing flux thinner is not a good option either. Neither is

BGA - down the middle?

Electronics Forum | Mon Dec 13 15:56:16 EST 1999 | David Spilker

In our DFM guidelines for PWB layout we have discouraged placing BGAs in the longitudinal center of a PWB. We believed the increase stress through reflow and wave was not good for BGAs - probably read it or reasoned it. Now, this position is being


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