Electronics Forum: plating (Page 221 of 252)

Is Anyone?

Electronics Forum | Wed Jul 31 01:40:46 EDT 2002 | kenbliss

Cal and everyone else on this forum I completely agree. Everyone needs to keep in mind, not everything is going over to China. The press says it is, they also told us the stock market was great and then they said the stock market was bad. The medi

Soldering PTH Card stiffeners

Electronics Forum | Tue Aug 13 12:22:03 EDT 2002 | dragonslayr

A bit of gray area for you. consider the application over the specmanship. Why are the stiffeners there in the first place? Is the rigidity requirement a high function i.e. very necessary due to potential shock and vibration , etc.? The soldering is

Flux Conductivity

Electronics Forum | Tue Aug 13 20:58:06 EDT 2002 | davef

Peterson: Ionic flux residues when combined with moisture and a voltage differential can plate conductive �fingers� on the surface of a PCB, but that doesn�t sound like what�s going on here. Your NC flux should not be particularly conductive. For

void on BGA Ball due to via on BGA pad

Electronics Forum | Fri Aug 16 10:00:03 EDT 2002 | davef

You have a very bad situation. It�s tough for the gas, flux material, er whatever to escape when the BGA is sitting on top of it and the blind via is blocking it from the other side. Obviously the vias should have been: * Placed on the edge of the


Electronics Forum | Thu Aug 22 22:09:05 EDT 2002 | davef

Determine the number points (parts) on a pc board to be measured/connected in temperature profile according to the purpose of the profile. For instance: * A thread here on SMTnet recently discussed �copper plate� profiling. It is used primarily for

Gold versus HASL

Electronics Forum | Fri Sep 13 09:16:36 EDT 2002 | bmulcahy

Hi dave, Only back in the forum today to see your query so here goes (1) VIA ,PTH holes -- we found that because the amount of gold being plated is generally less that the amount of HASL that holes can be physically wider. This then (pacticularly o

56mm feeders for Panasonic MPA P&P machine

Electronics Forum | Wed Sep 18 14:58:59 EDT 2002 | Claude_Couture

Just to add my 2 cents on the adjustment of pitch on MPA feeders: True: Panasonic do not make it easy to change the pitch on MPA feeders, the thickness of a metal part is what sets the pitch. My solution: for example, I get a 24mm X 12mm pitch MPA

Gold plated board, with csp's and 0603 with no clean apetures

Electronics Forum | Thu Sep 26 11:44:23 EDT 2002 | abelardo

Hello everyone out there in the SMT world. I have a dilema I'm currently running a board that has 3 csp's with a .75 mm. ball pitch and .3mm ball size. And 2 qfp's-160. The stencil is 4 mils thick and I'm using a 63/37 solder paste. My reflow prof

Gold plated board, with csp's and 0603 with no clean apetures

Electronics Forum | Thu Sep 26 20:43:51 EDT 2002 | davef

"OK. If the connection doesn't look like I expect it to look, how do I know that the metallurgy is correct?" Comments are: * There are no pictures that will get you though this. * You should expect that gold that is dissolved in Pb/Sn solder to make


Electronics Forum | Fri Oct 11 09:28:14 EDT 2002 | davef

Designers love to do BIG copper pours for several reasons: * Maximize heat spreading. * Increase EMI shielding. * Laziness. The poor folk that solder the parts on boards HATE big copper planes near solder pads. During soldering, fat copper traces [

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