Don,

Ask you CM or Production Engineer about the Pick n' Place machine
requirements.

The CM we are currently using  requires two Fiduicals within 6 inches of
a given part. For a large board (14"x14") there would be more "local"
Fiduicals
than for a small board ( 2"x  2") where one could get away with just
global Fiduicals.

 Hope this helps.

Dave



Donald Kyle wrote:

> Good morning
>
> I have one of those It Depends questions regarding fiducials and
> pick-n-place machines.
>
> Per IPC-7351 and I'm sure other standards, a board at minimum should
> have two fiducials on each end and each side.  Furthermore, if there
> are fine pitch components there should be two fiducials for each fine
> pitch component, sharing of fiducials is ok.
>
> For assembly houses that place components at a billion a second I can
> see the justification for the above requirements.
>
> But lets say that your customer requires typically 5 to 10 boards per
> run and those boards have fine pitch components.
>
> It's not likely that they would be asking you to build them but maybe
> you like to do prototypes and these quantities will fit somewhere in
> your production area.
>
> So my question to assembly houses is:
>
> Can you live with fiducials placed every two inches across a board
> such that any fine pitch component has two fiducials within two inches?
>
> Is it possible to adjust the speed of pick-n-place machines to
> accommodate for these parameters?
>
> Thanks in advance
>
>
> Donald Kyle C.I.D.+
>

--
Dave Seymour, CID+
Catapult Communications Inc.
800 Perimeter Park Dr, Suite A
Morrisville, NC 27560

Direct: (919)653-4249
Main: (919)653-4180
Fax: (919)653-4297

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