Hey, dgfischer, what's your beef with Tom here? He seems to be trying to help while you just seem to follow his posts and punch him in the dick. The primary reason one would surface a disk is to remove the scratches and grooves carved by errant pieces of debris lodged in the leading edge of the pad. To elaborate on Tom's point, he just suggested that if you have pulsing in the disk, its warped and probably not a good candidate to cross-drill. Another thing to consider is that if the holes you drill are too large, you begin to lose braking power because of insufficient surface area. The brake pads can't get much grip on a hole, see. I've seen guys with giant 5/8" holes in their disks, looking like swiss cheese. In my humble opinion, and I think the opinion of most manufacturers, 3/16" - 5/16" holes are optimum. Problem is, you've got to drill a lot more little holes than a few giant ones. You really should never remove more than 20% of a disk's surface area. For what it's worth, I have helped prepare a club-level 750 racer and we took the disks down to 4.5 mm with a 1.25mm radius @ .250" from the edge of the carrier recess. They held up just fine, but race braking is different from most daily driving (shorter, more intense heat cycles). As an aside; Tom, although I don't know you personally, may I offer this advice: Just don't respond to this little man's posts anymore. It's not worth it and makes you look like a crabby #$%*, which, based on the sense of humor you have displayed in hundreds of other posts, seems not to be true.
