Made this mandrel for a friend to help him turn the flat spots off longboard wheels.
The fixed bushing is held in place with a taper pin.
When I dropped it off at the skateboard shop, the guy there was interested in making a gang arrangement on a dedicated lathe to true up four skateboard wheels at a time. I doubt he'll actually go through with it, but I'll share it here if he does.
A conventional shearing cutter used for metals doesn't work for cutting the wheel, a slicing tool is needed to cut off a band from the outer surface. I didn't bother to grind a special tool, instead I just flipped a thread cutting tool upside-down to see if it worked. A dedicated cutter wouldn't be too hard to make and would do a lot better than this mess:
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