Electronics Forum | Thu Dec 09 17:45:27 EST 2004 | davef
You're correct. There is no criteria for no-lead, but there none for SnPb, either. Solder joint strength in pull/shear will vary with lead geometry, solder volume, lead metal/metallization, the way the test is done.
Electronics Forum | Thu Feb 17 08:14:57 EST 2005 | davef
The issue may not be the solderability protection. It could be that the metalization on the component terminal or the metal of the component terminal was not prepared properly before the solderability protection was added.
Electronics Forum | Tue Oct 11 17:27:49 EDT 2005 | artekeng
Depending on the metal and bond to FR4 you may be able to get a better profile if you use conductive heating.(vs standard convection reflow)
Electronics Forum | Thu Oct 06 07:28:11 EDT 2005 | chunks
The obvious is size. Besides that, it depends on your screen printer. Some "smart heads" need to be retaught with the metal blades for each board. Some need to have the set-up programmed changed too. Angle of attack is something to double check a
Electronics Forum | Thu Oct 06 08:55:05 EDT 2005 | stepheniii
If a rubber squeege is bumped on the edge, no biggee. But you have to be carefull the metal ones don't get dinged. All it takes is a little extra care but if your operators are used to handling the rubber one they might not increase the amount of c
Electronics Forum | Thu Oct 06 15:04:14 EDT 2005 | chunks
Stephen reminded me of another issue - be careful when handling or wiping new metal blades. They can cut you (oh the pain).
Electronics Forum | Wed Oct 12 19:54:03 EDT 2005 | AA
Hi, Thanks for the answers. I have a few others: How often you replace metal squeegees? Do they shorten the life of the stencil?
Electronics Forum | Sat Dec 24 07:48:52 EST 2005 | ams_gen
Hello, I need to rework a thru hole DIP mounted on a metal backed FR4. It is difficult to remove the FR4 board from the metal back since it is riveted. Is there a simpler way to takle this? Thnx
Electronics Forum | Wed Feb 08 08:49:46 EST 2006 | russ
Most distributors (well maybe not but ours do) actually have that information. i would think that the metal suppliers would also have metal pricing trend info.
Electronics Forum | Thu Oct 26 21:05:10 EDT 2006 | hector.iduma@ge.com
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