Nicolas-
>Open the CAM Outputs for... folder that you created when generating your
>Gerber. You will need to use an aperture table instead of RS-274X
>(embedded apertures) which is the default. Rt. Click on the Gerber Output
>control file and select Properties. Go to the Apertures tab and uncheck
>RS-274X. Then push the button that automatically creates apertures from
>your PCB file. Edit each flash aperture to have a non-zero hole, perhaps
>20 mils will be good for your application, maybe smaller.
Donut apertures will work, but you will need to back-away all traces from
the pad centers (the drill guide area), otherwise they will cover the donut
holes.
Perhaps an easier way is to produce a Gerber "hole master" which your fab
house can merge (as a negative image) with your outer layer Gerber. There
are numerous ways to produce the hole master.
If have Camtastic or similar software, just import a drill file, change all
holes to the same size, then export as Gerber.
It can also be accomplished within Protel, one method...
1. Globally unlock all components.
2. Globally select all pads with a zero hole size and delete.
3. Select all vias and convert to pads.
4. Globally change all pad diameters to desired drill guide hole size.
5. Generate a Gerber pad master.
Mark Koitmaa, C.I.D.
General Partner
Certified Interconnect Designer
TechServ
Tel: 408-369-7950
Fax: 408-369-7952
http://www.techservinc.com
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