Electronics Forum | Mon Dec 16 21:34:05 EST 2002 | grantp
Hi, Yes, the stencil does touch the PCB. Is there another method? Sorry to sound a bit dumb on that, however I don't have a lot of experience with automated stencil printing, and manual has been working well up to now with this BGA. Regards, Gra
Electronics Forum | Wed Dec 25 19:36:57 EST 2002 | MA/NY DDave
Hi DaveF already gave you some fine answers. Yes I have seen CNC routed copper PWBs, and the literature is filled with many unique trace types including laying of fine wires on a board or embedded. You wanting .15mm, and I am guessing, low resistan
Electronics Forum | Thu Dec 26 13:02:15 EST 2002 | MA/NY DDave
Hi Again, As I was thinking about this, I remembered another unconventional way that I was told about from one of the starters of this technology. Now I don't think anyone would use this technique anymore, yet here it is: Press Cutting and Pushing
Electronics Forum | Thu Jan 16 16:15:27 EST 2003 | billg2753
I have received a few boxes of fully assembled boards that have damaged packaging boxes due to rain water. There is visible moisture inside the ESD bag. I have no idea how long these boards have been exposed to moisture. Does anyone have a procedure
Electronics Forum | Sun Jan 19 10:25:54 EST 2003 | davef
You shouldn't freak. You want the pads on both sides of the BGA ball the same so that the torgue from changes in dimension due to different CTE [ie, interposer, solder, bare board, etc.] is balanced on the top and the bottom of the ball. So, the ma
Electronics Forum | Mon Jan 27 09:43:15 EST 2003 | davef
Sorry. I mistyped information on the guidelines. It should be: SM-785 - Guidelines For Accelerated Reliability Testing Of SM Solder Attachments Order SM-785 from: IPC 2215 Sanders Rd Northbrook, IL 60062-6135 847-509-9700 When you are ordering t
Electronics Forum | Mon Jan 20 09:55:09 EST 2003 | Claude_Couture
The carrier tape and cover tape of static sensitive components are either conductive or dissipative. as for the P&P machine, as long as they are made of metal and grounded, static buildup is not an issue. All PCB conveyors I've seen have static condu
Electronics Forum | Sat Feb 01 16:11:24 EST 2003 | Paul Smith
I would suggest scoring if the profile allows, leaving residual material of circa 40 - 50 mil - That is what I do on a 125mil thick PCB width of the pis is approx 200 mil Mouse bites on a board as thick as 135 mil will mean its extremly difficult to
Electronics Forum | Tue Feb 11 13:12:25 EST 2003 | Jim Mills
Use a PCB fab house that is capable of "Conductive Via Filling" is the way to do it right. A conductive epoxy is used to fill the drilled via PRIOR to final plating. After final plating, the surface of the "Filled Via" will appear to be the same as t
Electronics Forum | Wed Feb 05 15:19:16 EST 2003 | MA/NY DDave
Hi Mostly people here don't start off crawing or hawking about their own shops, or enterprises which includes me, David F in Haverhill and others. Yet it does happen if you watch very close. SO this is the wrong forum for asking your kind of a que
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