Homebrew PCBs

Hi all,

I'm trying to figure something out I know anyone who has been 
milling for a while probably already knows....

How do you line up the two sides of a double sided pcb when 
cncrouting it?

And also how to make a bigger cut out of the copper?  I'm using 
60deg angle bits, which when cutting the copper opens a very fine 
area between the trace and the rest of the copper - this is fine in 
many situations, but there are times where I want larger spaces 
between traces or trace and remaining copper, so I'm sure there is 
another bit I should be using for it, but I don't know what =)

-Tony