Hey Jack!

it worked! Great document! Thanks a lot!

regards

Jens Behrens

At 11:13 20.01.00 -0600, you wrote:
>IPC-7525 Stencil Design Guidelines is nearing completion and addresses some
>of these issues.  You can get a review copy (hopefully, if our e-mail feels
>like working at this particular point in time) by sending a message to:
>[log in to unmask]
>and in the SUBJECT line put: request IPC-7525
>(ya gotta do it exactly like it's printed above or the computer won't respond.
>Msg body can be blank, but good to put in your name/phone number in case we
>(probably) have an e-mail problem and need to contact you.
>
>We'll join you in rejoicing when all our e-mail is working again!!  jack
>
>>>> "[log in to unmask]" <[log in to unmask]> 01/19/00 10:21PM >>>
>Hi Steve,
>
>now that's intersting!
>
>Sure, the stencil opening must be smaller then the pads. But when you make
>them triangular isn't there too little paste on the pads? We work with
>0.15mm thick steel stencils and the amount of paste is already very low.
>
>What CAD program can generate such shape stencils automatically?
>
>regards
>
>Jens Behrens
>
>
>
>><< Ok..so what are the causes of solder beads?? >>
>>
>>Hi Jan!
>>
>>Solder beads or "Squeeze balls" as they're sometimes referred to, are caused
>>by too much of the gray stuff...solder paste. In a cleaning environment
>>they're usually not a problem because they wash off. But in a no-clean
>>environment, BIG headache!
>>
>>They can be eliminated by modifying the apertures in your stencil to reduce
>>the volume of paste you're putting down. Instead of square apertures you can
>>turn them into triangles or "homeplates" with the pointy ends pointing
>>towards each other to the center of the footprint. A lot of  stencil vendors
>>will do this automatically...at least mine does. I just tell them I want
>>no-clean apertures for all the passives...I think it's an extra $25-50 charge
>>for the editing they have to do in the gerber.
>>
>>Hope this helps...
>>
>>-Steve Gregory-
>
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