Quote:
Originally Posted by squirrel
heh...I used the compound rest. I suggested that the error would be pretty low if we made the half roller as two cones. Kevin figured the angles at 6 and 16 degrees, I set the compound rest to those angles to turn it. then we sanded the lump in the middle to radius it.
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You could do a similar thing for the parabola.
Or if you had time to kill you could cut a series of steps.
Or not :-)
Anyway, I thought the math might be of interest.