Topic: Brake rotors

[bwaller]

Here's a request for the machinists in the group. I have to get a couple 4.5mm stainless brake discs surfaced and would like some suggestions. These have not been used on a race bike and don't show any bluing, but I know that on a lathe these things can vibrate when machined. One local guy suggested a rotary table on a mill, and another fiqured they should be ground.  Any thoughts?

Thanks

[MRieck]

 If you want to resurface them have them ground. If you want to thin them you will need to cut them on a lathe and then have them ground.

[bwaller]

They really only need to be surfaced, I'll check into getting them ground.  Thanks, Mike

[cb(r)]

I am not sure these are suppose to be resurfaced but the first couple of things I would check is if the rotor are warped and or out of parallel.  It is pretty difficult but not impossible to straighten them up.  check these two things first or headaches can arise.

If they are not warped and are parallel then it would be a little more easier. 

[byidesign]

If you find they are good enough to grind , try to have it done on a rotary table,
   start flange{bolt pattern,wheel attachment side down}this side will have no wear, and skim the{outside rotor face}.then put that side down, and do the remaining side.
   very light cuts, or use coolant . this will keep it true, with a minimum of warpage.
    I have done it on my cb650 with good results.