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Flywheel pattern making

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Chuck in E. TN:
 I am researching making patterns to cast al flywheels. I found a drawing from Elmer Verberg’s info at the Jon-Tom website. How do I machine the tapered spokes,  shown in the drawing below, on a rotary table? I can understand the setup for drilling the corner holes for the cutouts, but how do I offset  for the taper of the spokes?
Chuck

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