Larry,

If they get them backwards you find another vendor. I have been supplying 2 drill files and 2 router files
for a long time without a problem. A vendor should be able to pick up the error anyway. Lots of traces
terminated at npth's will usually throw up a flag.
I don't supply a drill drawing but I do include a drill tolerance table on the fab drawing. The drill
drawing is redundant since it duplicates info already in the drill file and on the fab drawing (in my
case). The only holes that I indicate on my fab drawing are mechanical type holes and tooling holes that
require a non-standard positional or size tolerance.
If the vendor wants a drill drawing he/she can print one out from their CAM editor after they read in the
drill files.
--
Scott Buscomb, Senior Designer
[log in to unmask]
Techsonic Industries Inc.
Humminbird/Zercom Marine Electronics
1111 Alderman Dr. Ste. 250
Alpharetta, GA 30005
770 475-3020 ext.1032

http://www.humminbird.com


Larry Campbell wrote:

> What would happen if he got the two files backwards?
>
> >>> Bob Walker <[log in to unmask]> 09/24/98 12:45pm >>>
> Hi All,
>
>  I'm trying to better understand the process of drilling holes in a PCB
> and the files that are used by the board fabricators to do this. I am a
> PCB designer and presently send gerber files (fabrication gerber
> included) and a drill file (excellon format) to my board house for boards
> to be made. The fabrication drawing contains a drill table with symbols
> that represent each hole size and whether or not it is a plated or
> non-plated hole. I never allowed a plated and non-plated hole to be the
> same size in any of my designs because my CAD tools couldn't
> recognize
> that a plated and non-plated hole could be the same size and thus
> couldn't generate 2 different symbols for each. Well now my CAD vendor
> has provided me with the ability of tagging my padstacks as either a
> plated or non-plated hole so that I can generate a different drill symbol
> for my fab drawings. And I can also generate different drill files that
> can either include all hole styles, only plated holes or only non-plated
> holes which I thought would help my board fabricator out by not having
> to
> separate out the plated from the non-plated hole coordinates in the drill
> file. But when I called him to see if he could make better use of 2 drill
> files (plated and non-plated), he said he only wants the 1 file that
> contains both the plated and non-plated hole locations. Wouldn't it be
> better to have the 2 files? What don't I know? I would greatly appreciate
> all feedback from any designers or board fabricators.
>
> Regards,
>
> Bob Walker
> [log in to unmask]
>
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