Step 1: Ball turner base plan
Step 2: Machining the base
#2shows milling the edges square
#3 shows milling the a edge slots that fit in the cross feed ..
#4 shows the top milled flush with the cross feed and it fits very snug.
Step 5: Making the Rotor
#2 Shows boring a hole 1 1/4 wide by 3/8's deep to fit a bearing.
#3 shows the rotor with the 1 1/4 outside diameter x 3/8's thick x 1/2 inside diameter bearing press fitted flush to the bottom edge.
Step 6: Milling the rotor
#2,3,4 Show milling the rotor to the correct size for clearance to cut the knobs
Step 8: Making the cutter bit bracket
#3 Shows the milled slot for the carbide bit will sit.
#4 ,5 show the bracket milled to the proper thickness.
#6 Shows the 1/4 inch milled adjustment slots .