Too much solder volume? Charles said he was using a 5-mil stencil and having
problems, so suggesting that a rubber squeegee was scooping out more solder
would take that deposit down closer to 4-mils seems extreme to me...for a 1206
chip network anyway. I don't look for 4-mil deposits unless I'm doing something
like microBGA's, CSP's, or 0201's...certainly not with 1206 chip networks.

I still think it has more to do with termination styles...I've experienced
it.

I  could be wrong...I've been wrong about things before.

-Steve Gregory-
That's what I was thinking.  Could that be why Poh's rubber squeegee worked,
because it was scavenging some of the solder out of the apertures?

Gary Camac

"Allen T. Maddox" wrote:

> Sounds a little like too much solder volume. Maybe a good idea to reduce
the aperture.
>
>
> Allen Maddox
> Sr. PC Board Designer
> GAI-Tronics, Corp
> 610-796-5854
> PO Box 1060
> Reading, PA 19607-1060
>
> [log in to unmask]
> www.gai-tronics.com
>
> >>> [log in to unmask] 02/17/04 06:56PM >>>
> We have a new assy. that uses 1206 capacitor networks. We are have a serious
> problem with bridging and unsoldered connections. We think we may have
solved
> the non soldered problem by increasing the soak before reflow but still have
> the bridging. Anybody have similar experiences? We are using a 5 mil.
> stencil. The other parts all seem to solder well. We are considering having
> the apertures for these parts reduced. Any suggestions would be greatly
> appreciated.
>
> Charles Caswell
> The Big Kahuna

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------