I did one by broaching. I did that in the lathe but not under power. I put a v-tool in the tool post so that it cuts on the horizontal axis relative to the chuck, set it on center. I then marked a piece of tape around the chuck every inch with my wife's sewing measuring tape. I then installed my dial indicator to act as a pointer only, on the marked chuck. I then set the compound cross feed to 5-degrees. By dragging the tool radially outward across the prop hub I got a groove that made a pyramid as I came out to the larger diameter. cut one groove then advance one inch of rotation on the chuck. If you cut at 0-degrees you get a flat top at the outside of the hub. By repeating it on the marks on the chuck I worked my around until the hub had nice radial v-grooves. It turned out very professional looking.

I have knurling tools but did not bother. The hub I got from a manufacturer had arcs instead of radial lines. I infer they did it with a flycutter and a rotary table in a mill. I don't have a rotary table ...so ther you go.

ENCO has lot of machine tool for reasonable prices.