Drilling Break Rotors

[Sonar465@aol.com]

I have the capability to drill my own break rotors at home (Brother is as
psycho as me, he is building a fairly large working steam locomotive so he
has a lathe and mill).   What I want to know is other than cad-plating is
there any magic that manufactorers of drilled break rotors use.  Looking at
pictures in various magazines it looks like most use a 30 degree spacing.
 are they carefull of the webbing inside vented disks?  Thanks for any
insight anybody might have out there.

Jim
'87 5KTq (IA stage II, Fuchs Wheels, Euro Lights)
'84 Ur-q (TAP BOX, 8" Wheels, Big Exhaust,Springs, Bushings) in need of a
clutch