Electronics Forum | Tue Dec 10 18:30:15 EST 2002 | MikeF
From personal experience, if the PWB vendor is cutting costs and doing their final rinse with tap water instead of DI you will get ionic contaminants left on the board. You might consider having CSL, or one of the other independent labs mentioned e
Electronics Forum | Mon Dec 09 09:31:35 EST 2002 | MA/NY DDave
Hi Just one idea, many exist. If your electrical designers can tolerate it, sometimes a cross hatched design is used under areas where electrical performance is important. It reduces coupling and impedance effects compared to a full layer. Elimina
Electronics Forum | Mon Dec 09 20:34:20 EST 2002 | MA/NY DDave
Hi I hear you, and you are right, yet most good process engineers strive to make future life a little easier by going back to the designers and making some alterations that don't affect performance. Now if we did a 6 sigma type analysis than this p
Electronics Forum | Thu Dec 12 11:45:49 EST 2002 | MA/NY DDave
Hi Gee I am going to have fun with each of these messages. Thank goodness you are alone, and maybe you are able to use the tempo of the music to speed up your work or create greater concentration. I know it can happen. And then you probably turn of
Electronics Forum | Mon Dec 23 13:36:42 EST 2002 | Jkhaiar
Hi Dave F As usual a simple Question with a complex issue My view to the music Walkman or any other entertainment at work place issue is a matter of Principle. When accepted to sell my Working hours for a pay "The entire working hours should be tota
Electronics Forum | Tue Dec 10 20:42:43 EST 2002 | davef
Vijay, Sounds like you're not spending enough time at liquidous plus 20*C. And you need to stay there for 5 to 10 seconds. I know, I know. We have used bucketsful of WS609 over the years. See, as you say, the melting point of your solder alloy
Electronics Forum | Fri Dec 13 19:01:14 EST 2002 | Tooling Guy
I have heard of people using tiny lead-shot filled bags to hold down thru-hole components on circuit boards while running through a wave solder machine on selective solder pallets. How successful has this been? What kind of material is being used f
Electronics Forum | Tue Dec 17 18:16:18 EST 2002 | davef
Square apertures can have a larger area within the same space than a round aperture. You can buy IPC 7525 from IPC. The theory you are missing has to do with: * Aspect ratio * Area ratio Search the fine SMTnet Archives for background on these rati
Electronics Forum | Thu Dec 19 14:29:03 EST 2002 | mark
It sounds like the stencil wasn't polished. Most stencil sources that only offer laser cut stencils do not have the electro polishing chemistry because they don't want to deal with the waste treatment issues. I suggest you verify that the stencil is
Electronics Forum | Thu Dec 19 14:29:06 EST 2002 | mark
It sounds like the stencil wasn't polished. Most stencil sources that only offer laser cut stencils do not have the electro polishing chemistry because they don't want to deal with the waste treatment issues. I suggest you verify that the stencil is
