Yes, the unplated holes are a secondary operation, often done as part of
the routing operation, and WHY don't you send the drill chart?

I place full documentation specifying materials, dimensions, tolerances,
plating, routing radii, bevels and any other things the fab shop may
have questions about, including my name, address, phone number, cell
phone number all on the same print as the drill drawing. They have the
choice of plotting it or not, but at least I can show them that I gave
them all the information.

The drill chart is every bit as important as any other specification.
You know how incomplete specs drive us all crazy? Well, imagine being a
board shop that is pushing out dozens (maybe hundreds) of proto orders
out every day, and having to guess at things because of incomplete
specs.

P.


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Spehro Pefhany
> Sent: Sunday, December 28, 2003 1:10 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE:] PCB Fax Express warning
> The only difference I see is a note on the drill *chart*,
> which I don't normally send to prototype houses.
>
> I presume that unplated holes are actually a secondary
> drilling operation, performed after plating. Anyone know for sure?

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