You may also find the assembly line manage boards in a panel more
effectively e.g.
1 size A4 panel with a number of boards is better to handle as one board
that 50 little
boards that fit on an A4. You may also need to think about solder past
stencils that will
need to be stepped exactly the same as the boards. With out drawings this is
not easy.
Draw your panel the way you need the boards supplied and get the PCB vendor
to step
the solder past artwork for stencil generation at the same time as the PCB
artwork is stepped.
Regards,
Dave Sharples
> I always do a panelisation drawing of sorts for SMT boards.
> Also if any board has any overhanging parts I would do a drawing.
>
> Why?
>
> Because when the panel of boards gets downstairs to the production
> department, they "need" special attention
> paying to what size borders they have, if it is scored etc, where the
> fiducials etc go.
>
> How many to be in a panel, The direction of flow of the board etc.
>
> IF I do not provide a drawing and cannot describe it verbally well enough
we
> get whatever the fab wants to chuck at us
> and usually end up spending longer making the boards for some reason or
> another. And that costs.
>
> In addition, if for some reason the fab was to change the panel, we would
> have a drawing to fall back on.
> This has happened.
>
> Matthew Lamkin.
>
>
> > -----Original Message-----
> > From: Alexis Meehan [SMTP:[log in to unmask]]
> > Sent: Wednesday, April 23, 2003 2:32 AM
> > To: [log in to unmask]
> > Subject: [DC] Panelization or Not?
> >
> > Has anyone out there found it to be beneficial to create your own
> > panelization drawings
> > as part as your fab drawing? I'm rewriting some processes, and there are
> > some factions
> > at my company who want to see panelization drawings as part of the fab
> > drawing.
> >
> > Their reasoning: if a proto is built at 4 up, then it goes to production
> > and the fab house
> > decides to do 8 up on a larger panel, it's possible that they may alter
> > something critical
> > so that it is now 'different' from the tested protos. I'd like to get a
> > sanity check, since this
> > makes no sense to me.
> > We use a few different fab vendors for protos, but only one for
production
> > boards.
> >
> > My experience is that doing these drawings took time and there was never
> > really a
> > payback for the effort (in fact, some vendors complained about it).
> >
> > Any and all feedback would be greatly appreciated.
> >
> > ~~~~~~~~~~~~~~~~~~~~~~
> > Alexis Meehan
> > PCB Design Manager
> > NOKIA
> > Nokia Internet Communications
> > Desk Phone 650.625.2124
> > Cell Phone 650.892.2572
> > ~~~~~~~~~~~~~~~~~~~~~~
> >
>
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