Electronics Forum | Fri Feb 04 09:23:21 EST 2000 | Casimir Budzinski
If No-Clean flux does not need to be cleaned, then why do I get readings of up to 27(ug NaCl/sq in) on boards that are not washed, up to 23.4(ug NaCl/sq in) on boards washed with DI water only and from 1.2 to 10.1(ug NaCl/sq in) on boards washed with
Electronics Forum | Tue Feb 01 09:53:58 EST 2000 | Ron Costa
I've been using the Electroless Nickel/Immersion Gold plating process for some time now. Here is what i know: It's very flat and solderable if you hold the board house to the following criteria: 120u inches of Nickel 4-9u inches of Gold What type of
Electronics Forum | Tue Feb 01 21:53:06 EST 2000 | Dave F
Emmanuel: You have choices to prevent the solder paste from flowing to the second side during reflow: 1 Have your board fabricator plug the vias. 2 Put a temporary solder mask on the secondary side vias. 3 Have your designer relay-out the vias unde
Electronics Forum | Sun Jan 30 21:56:05 EST 2000 | Paulvannan
We used Promosol Sn96.5/Ag 3.5 during our initial qualification for similar application. We could not achieve a shiny solder joint. Our changes to Sn95.5/Ag 4.5 does not improve the look. In order to confirm the reliability of the joint, I suggest yo
Electronics Forum | Thu Jan 20 12:10:29 EST 2000 | Dave F
Hany: I have never understood why the add-on boards in PCs have gold plating on their connectors. In the military and in avionics, they require gold on connectors to protect from wear and corrosion. But PCs ave very different. PCs: * Are obsolet
Electronics Forum | Fri Jan 14 08:09:20 EST 2000 | Wolfgang Busko
We are using frameless stencils with a frame system tensioning in X- and Y-direction. After first quarrels with our stencilhouse about the correct position of the tensioning holes ( they needed 4 tries to get it right) there are no problems any more.
Electronics Forum | Thu Jan 13 12:51:30 EST 2000 | Dave F
David: I'd suggest: 1. Cutting and not bother desoldering all leads (to save the pads). Trust me, desoldering is not as easy as some would lead you to believe!!! 2. Levering that puppy offa there with a screw driver and some "padding" to protect t
Electronics Forum | Thu Jan 06 04:20:50 EST 2000 | R Lahat
Vishy, I was in the same boat. I had to run 3 siemens smt lines and get good results. I used the Arena simulation software to program in my 3 smt lines and found it very complicated but can be done. In parallel I took in industrial engineering stude
Electronics Forum | Thu Jan 06 01:55:01 EST 2000 | Roni Haviv
From my experience: It's depends on your messurment tools and the component: - Average high (at least 3 messurment points) should be 6 mils max. (you'll always get pick points of 4-7 mils!). - It depends on component tech./pitch: in pitches great
Electronics Forum | Wed Jan 05 07:40:06 EST 2000 | jacob lacourse
we have looked into a number of depaneling machines and can't justify the cost. what we are trying to do is to eliminate failures due to part stress when employees are breaking out the boards by hand. I heard about pneumatic scissors one day but to
