Electronics Forum | Sun Apr 18 05:02:53 EDT 2004 | Rob
Hi, I am a Quality person (Metalwork fabrication and System assembly)but have not had any experience of SMT before. I am trying to put some SPC in place for reflow and others and have come across something I do not understand. Our current SPC Chart c
Electronics Forum | Wed Apr 28 12:33:05 EDT 2004 | Dave G
Rob, Don't know if you bought an "H" tower with your UP or not. You did you can have a dedicated support plate made from Aluminum that has pockets machined out to match components on the bottom of the board. (Most of the workholder guys can set you
Electronics Forum | Wed Apr 28 16:07:32 EDT 2004 | davef
In rework, your thermal recipe needs to better mimic the recipe that your use in your reflow oven. Oh, that and proper preheating of the board and BGA. [Yano, if you get bored fighting this, rereflowing the board is within reason.] That you are hi
Electronics Forum | Thu Jul 22 07:52:37 EDT 2004 | Chris L.
Hi Grant, The purpose for allowing the solder paste to reach room temp before production is to reduce the amount of water absobtion from the air. (e.g. a cold glass of water "sweats" on a humid day)The purpose for mixing is to make the viscosity more
Electronics Forum | Mon Jul 26 06:32:58 EDT 2004 | cyber_wolf
Grant, The only thing that you really gain from refrigeration is a couple more months� shelf life. Refrigeration also seems to slow down flux separation. I am not sure how your paste consumption is, but we use ours up way before the expiration date
Electronics Forum | Tue Sep 14 14:25:35 EDT 2004 | scombs
Thanks everyone for all the input. All of our stencils do have the PCB # etched on the foil but when operators look for the stencils they are looking for the part # on the frame since they are all stored vertically in a couple of Remstar shuttles and
Electronics Forum | Tue Feb 15 18:09:45 EST 2005 | GS
Hello everybody, according to your experience, what is the allowed or suggested (by Suplliers,or Standards,or best pratics) shelf life for components (SMD/PTH) from fabbrication date to the soldering date ? Let's consider best case when compon
Electronics Forum | Wed Feb 16 12:34:49 EST 2005 | greg
Hi all We recently have a problem with component in package 0805 (capasitor 100nF). I have noticed that after reflow soldering only one lead of the component is soldered. The second one is just laying on the PCB land. We use screen printing process
Electronics Forum | Thu May 26 08:58:24 EDT 2005 | K
Hi Folks, My boss has me chasing mischuck figures and I need some stats for a report. All of my machines are humming at over 99% efficiency so theres no major loss there, but still there is a huge descrepancy between stock after its been through ou
Electronics Forum | Wed Jul 13 09:19:11 EDT 2005 | Rob
Good question - lead itself isn't anything to do with global warming - it's main issue in europe is leaching into the water supply, as we bury our trash then build on it & store our drinking water in it, as we have a much greater population density t