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August 2000

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Subject:
From:
Gabriela Bogdan <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 11 Aug 2000 22:17:58 +0300
Content-Type:
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text/plain (105 lines)
We always waiver lack of topside fillet if the hole is heat sinked, our decisions are
based on the last version of IPC-610 which has a picture for ACCEPTABLE fillet for this
case. Being at home now, I don't remember  the% of fillet height, but you can check it
out.
Gaby

Hinners Hans Civ WRALC/LYPME wrote:

> Hi Ya Steve,
>
> Yeah, we have a fairly thick (~140 mil) backplane with several leads heat
> sinked to the nth degree.  Fortunately, our customer had already been
> through it once and waived the topside fillet requirement for those babies.
> In fact, they said if we did see a good fillet in those locations we fried
> the board someplace else.  Talk about a process control indicator . . .
>
> Hans
>
> ~~~~~~~~~~~~~~~~~~~
> Hans M. Hinners
> Materials Engineer (Process & Manufacturing)
> Warner Robins Air Logistics Center
> Avionics Production Division
> Manufacturing Branch
> 380 Second Street, Suite 104
> Building: 640, Mail Stop: LYPME
> Robins AFB, GA 31098-1638
> Voice: (912) 926 - 1970 Fax: (912) 926 - 7164
> mailto:[log in to unmask]
> http://www.robins.af.mil
>
> -----Original Message-----
> From: Stephen R. Gregory [mailto:[log in to unmask]]
> Sent: Thursday, August 10, 2000 2:00 PM
> To: [log in to unmask]
> Subject: [TN] Topside solder fillets after wave...
>
> Hi all!
>
> Been trying to dial a profile in on the wave today with a board that's
> fairly
> thick, probably around .090", polyimide, all PTH with a fair amount of the
> IC's being ceramic. We use a spray fluxer and a RMA flux.
>
> The first boards have been coming off without the preferred topside fillets
> at a number of locations. I've been playing with the pre-heat, belt speed,
> and even did something that I don't like to do, which was to flux the
> topside
> of the board.
> All to no avail...I still had quite a few places that didn't have topside
> fillets, and that is something that doesn't go over well here at all.
>
> I started noticing that the places that didn't have topside fillets were at
> the same locations. So I came back to my 'pooter and looked at the gerber
> for
> the board. What's really weird was that everyplace there's a thermal for a
> pin is where I have no topside fillet??? I thought that thermals were
> supposed to help prevent that from happening? But it's true, every single
> place there is a thermal= no top solder. Has anybody ever seen that before?
>
> -Steve Gregory-
>
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