I am guessing that you SIPAD, means Silver Immersion Pads. If so then we have done this, and with great results but there is always one knucklehead. I guess this issue may be more of a nusiance then it is technical.
Ronald D. Peeler Jr., B.S. IE
Process Engineer
SWEMCO
Moorestown, NJ 08057
Tel: (856).222.9900 ext. 31
Cel: (484).948.0779
Fax: (856).222.0700
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Wayne Thayer
Sent: Friday, June 08, 2007 1:23 PM
To: [log in to unmask]
Subject: Re: [TN] SV: [TN] Insufficient Solder
I suggest anyone who is frustrated like this give SIPAD a try. That way the solder deposition is someone else's problem!
SIPAD still uses stencil deposition, so you may still need to adjust the two fundamental adjustment parameters: Stencil thickness, as you mention, and stencil aperture size. If you have spots chronically low on solder then you will have to allow the stencil aperture to exceed the pad size--not really a problem in most cases since the paste will all pull in on reflow unless the aperture interferes with an adjacent pad.
Wayne
>>> [log in to unmask] 6/8/2007 1:13:40 pm >>>
Flux! Key to many problems.
Inge
-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Ron Peeler
Skickat: den 8 juni 2007 16:57
Till: [log in to unmask]
Ämne: [TN] Insufficient Solder
Here is an age old question. Does anyone here have a sure fire way to
combat insufficient solder. I have tried all teh tecniques from what I
know of. These consist of changing stencil thicknesses, changing
pastes, re-training ops to IPC-610-D. I am at a lost. It seems that
each operator sees insufficient solder differently and it is almost an
excuse from them to keep busy and make added "touch up." I am almost
ready to through the category out the door b/c it is so subjective adn
people are so fickle.
Any ideas out there?
Ronald D. Peeler Jr., B.S. IE
Process Engineer
SWEMCO
Moorestown, NJ 08057
Tel: (856).222.9900 ext. 31
Cel: (484).948.0779
Fax: (856).222.0700
[log in to unmask]
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