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  1. #1
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    Default Anyone here ever machined down the outside diameter of a rotor?

    I have an 11.8 diameter rotor that I need to be 11.5"

    I have access to a full machine shop. I'm not seeing any reason it couldn't be done. Anyone else tried it? I'm thinking either the lathe or surface grinder.

  2. #2
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    I dont see why not. since you have access i would do it in a lathe so it will be true when you are finished. You are shaving such a small amount i dont see it being an issue. Just match your cuts to how it loos factory.

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    Yup. Done it a few times.

    Spin it on a lathe and its just fine.

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    I have. I used a mill w rotary table. A lathe is better if you have a fixture for bolting
    the rotor to. with the rotary table it's a cinch bolting the rotor down, but it will take
    a little longer machining it, than a lathe would.

    I used a large 1/1/4" cutter & took off .010 for each rotation, & finish
    it off with a .001 cut with a slow (rotary) table speed, & go 1 extra rotation for a nice
    finish. Cobalt or Carbide cutters will work best if the rotors are stainless.

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    It would also be easy to turn a flanged mandrel on the end of some scrap with a couple of bolt holes which need not be very precise since the mandrel would center the rotor.

  6. #6
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    Thanks for the responses.

    I put touring wheels and a road king front end on my this old scrambler I'm building for my son. The front wheel was dual disc, and since there's no need for all that on this little bike, I pulled the right side disc and moved it to the back. I have a dyna caliper I was planning to use, but it's for an 11.5" rotor. Rather than buy a new rotor I'll just machine this one down to size.

    Now to find a caliper for the front, and figure out if I'll need 11.5" or if I can find a good price on a caliper for an 11.8"...

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