Shaping the Knob

The knobs on my reels have just been simple cylinders. They might look better with some shaping, perhaps a “waist”.
IMG_4386
Here is a material blank mounted on a mandrel, ready for turning.

I want to make a concave arc cut on the cylinder, and the setup is to use the mill as a lathe.
IMG_4387
The mill headstock is horizontal and a tall toolpost is fastened to the rotary table. I have used a similar setup to cut convex spherical surfaces on counterweights and center screws.

This plan view sketch may help to explain.
IMG_4389

Here is the shaped cylinder.
IMG_4388

New knobs on reels under construction:
IMG_4385

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