Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

I hope I'm presenting this question in a manner in which it can be
understood.

My question is in regard to Gerber File creation in order to send
files to a PC Board Fabrication house for a number of PCBs to be
produced.

After the board layout is completed in Eagle, I run the Drillcfg.ulp
file to generate a tool (drill) size report (filename.drl). I also
run drillinfo.ulp so that I can have a listing of what library
components create which drill hole size. I can then cross
check the (component) library generated hole size against my "real
world" component lead sizes, and determine what "real world"
components have lead sizes which do not match the drill sizes of the
intended PC board fabrication house.

I am ASSUMING if I find "real world" component leads, which do not
closely match the board house's hole sizes ( hole size 4 to 6 mils
over the component lead diameter ) I should edit the "filename.drl"
so that the hole size for the component is equal to an available
drill size, 4 to 6 mils larger than actual component lead size.

The editing of the "filename.drl" should occur before any further
Gerber File processing?

I have spoken to a couple of people, who say that they do not perform
any editing they just rely on the board house to provide PTH with the
correct finished hole sizes. I thought I would ask this group before
proceeding, as anything resulting in unusable boards would result in
money I can not afford to loose.

Please reply with reply with your experiences, thoughts, or
corrections to my reasoning.

Thanks