>  Ron James wrote:
>
>  different from one design to another.  Also, Orcad is limited to 46
>  different symbols, and we are already pushing that number of drill
>  sizes for our entire library.  This means that if we want to use
>  standard symbols across all designs, we will have to bypass Orcad's
>  automatic symbol assignment and come up with a very manual process.
>
Hi Ron,

All my padstacks are "coded" with the drill symbology used on the
fabrication drawing. In Cadence it's really easy, and the fab drawings
generally take no more than 1/2 - 1 hour to finalize (if the designer
needs more, he gets more training!), including plots and checking time.
Remember when developing the drill symbology that you can combine a
range of hole sizes into a "specific" symbol. You should never need
anything near 46 symbols. At most I'll have maybe 15 different drill
sizes on my boards, and if a padstack needs to "round up" to a larger
hole size (for simplification), I mod the padstack, and the system DRCs
any problems. I will normally modify 2-3 padstacks to round up and limit
the number of holes sizes needed, but I will not "round down".

Good luck.

Mitch  :)
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