Homebrew PCBs

ANdrew,

Sorry if this has already been asked/covered, but are you using these 
drills on a CNC machine?  If so, does that machine have tool length 
offsets?

If so, wouldn't it be easier to measure the tool length and change the 
offset than to change the physical length of the tool to match the 
offset?

I am just starting to tinker with PCBs on my CNC router so I am just 
trying to grasp the overall process that others are doing with PCBs 
and CNC machines.

Chris