Make sure if you trim leads after the wave process, you reflow the solder
connections. The trimming process will fracture the joint (especially THAT
short!) and you'll get all manner of test failures.
(If someone already said that, I apologize - I'm flat out today!)
Jan Pelchat
Sr. QAE
Benchmark Electronics
Hudson Division
On Tuesday, May 18, 1999 2:21 PM, Thomas DeSmit
[SMTP:[log in to unmask]] wrote:
> Steve and Fikreta,
>
> The company Steve is thinking of is Q-corporation located in Derby, Kansas
> (just down the road from us here in Wichita). Their phone number is
listed
> as (316)788-3746.
>
> Thomas DeSmit
> EDA Librarian/Sr. Engineering Tech.
> IFR Americas, INC.
>
> The opinions expressed are my own, and do not necessarily reflect those of
> my employer.
>
> > -----Original Message-----
> > From: TechNet E-Mail Forum. [log in to unmask] [mailto:[log in to unmask]]
> > Sent: Tuesday, May 18, 1999 2:06 PM
> > To: [log in to unmask]
> > Subject: Re: [TN] leads trimming
> >
> >
> > In a message dated 5/18/99 10:26:20 AM Pacific Daylight Time,
> > [log in to unmask] writes:
> >
> > << Hello there,
> > I have requirements to trim leads down to 0.035". Have anybody
> > try to prep
> > that short before wave. Board size is 4"x6" . I would like to know if
any
> > experience with machines that trim leads.
> >
> >
> > Fikreta Jusufagic
> > Mfg. Engineer
> > Sanmina Co, San Jose
> > Voice: (408) 954-5594
> > Fax: (408) 954-5277 >>
> >
> > Hi Fikreta!
> >
> > You sure that's TRIMMING leads? Sounds more like SHAVING them to
> > me! (GRIN)
> > That is some short puppies...
> >
> > I've had to do some boards like that before, only because of the poorly
> > designed case that the board had to go in, if you didn't trim
> > them that short
> > things could short out on the case. But I did it after
> > wave...there was a lot
> > of radial components on the board that also had to stand-off the
> > board, and
> > if I trimmed them before wave they would fall over.
> >
> > As far as equipment, a good person to send a email to asking
> > about that stuff
> > is Paul Klasek ([log in to unmask]) if he doesn't read this email
> > already...he's on the TechNet too. (HEY PAUL! Ya' there?) I remember him
> > helping somebody out a while back using one of those
> > teflon-coated, spinning
> > blade deals...the name Q-Tron seems to stick in my mind for some reason?
> >
> > As far as I'm concerned, the only reason you should need to trim
> > leads that
> > short is because somebody wasn't thinking when they designed
> > whatever product
> > you're building. They shoulda left room for at least 60 to 100 thou..
> > Trimming leads that short there's always the chance of fracturing
> > the joints..
> >
> > But hey, I know how it is, you get whatever the customer gives you...you
> > being at Sanmina, a contract assembly company like me, you do the
> > same thing
> > I hafta do too...
> >
> > -Steve Gregory-
> >
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