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Re: gEDA-user: Fiducial

I started out by using one of the fiducials you guys have listed with
a pad as a sub-element.  However when I started reviewing my PCB with
my assembler rep he noticed that their would be a hole in the stencil
causing solder paste to be applied to the fiducial.  I changed to the
pin with zero size hole and the paste is naturally gone.  However now
I have fiducials on both sides with a big hole in my GND plane because
of the clearance to the GND polygon.  So, is their a way to get PCB to
not put paste on a pad so I can go back to having a fiducial on one
side of the board?

Thanks,
Jeff

On 9/11/06, Phil Taylor <phil@xxxxxxxxxxxxxxxxxxxxxxxx> wrote: 
> standard libraries?  Has anyone posted fiducials that I could use as a
> starting reference?
>
> Thanks a lot for your assistance guys.
> Jeff

Jeff,

Here are three fiducial footprints.  First is a top-layer pad only.

Second is a 50 mil pad with a 100 mil clearance circle and a 100 mil
soldermask opening.

Third is the same as second but with a 175mil clearance circle.  This is
the one I see the most on other peoples' pcbs.

The 2nd and 3rd version appear on all layers.  Please let me know if
they work out for you.

phil




_____
Element[0x0 "FIDUCIAL__pad-50-100-100.fp" "" "" 0 0 0 0 0 100 0x0]
(
        Pad[0 0 0 0 5000 5000 10000 "" "1" 0x000]
)

_____
Element[0x0 "FIDUCIAL__pin-50-100-100.fp" "" "" 0 0 0 0 0 100 0x0]
(
        Pin[0 0 5000 5000 10000 0 "" "1" 0x001]
)

_____
Element[0x0 "FIDUCIAL__pin-50-175-100.fp" "" "" 0 0 0 0 0 100 0x0]
(
        Pin[0 0 5000 12500 10000 0 "" "1" 0x001]
)


Element[0x0 "FIDUCIAL__pad-50-100-100.fp" "" "" 0 0 0 0 0 100 0x0]
(
        Pad[0 0 0 0 5000 5000 10000 "" "1" 0x000]
)


Element[0x0 "FIDUCIAL__pin-50-100-100.fp" "" "" 0 0 0 0 0 100 0x0]
(
        Pin[0 0 5000 5000 10000 0 "" "1" 0x001]
)


Element[0x0 "FIDUCIAL__pin-50-175-100.fp" "" "" 0 0 0 0 0 100 0x0]
(
        Pin[0 0 5000 12500 10000 0 "" "1" 0x001]
)




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