I volunteered to turn 12 bubinga knobs for a fellow woodworkers project. What a humbling experience! I practiced for 3 weeks using up about 5' of 3" by 3" poplar. I started with 3 12" x 2" x2" bubinga. I could get 5 - 2" x 2" x 2" pieces out of each of the 3 pieces of bubinga. The 6th piece was to small to be held in the jaws I have for my chuck.
Trying to make 12 identical knobs was a challenge. It proved to me how well honed my turning skills really are...or are not! I called and was talking with John Hart about it and he said.....You remember what NAVY stands for don't you?....NO......Never Again Volunteer Yourself!.....I'd forgotten......
So here they are for your display and scrutiny.....15 bubinga knobs...I hope the guy can find 12 he can use!
For you beginner turners....the last photo is the remnants of the blanks. Look at the "shoulders" or "tenons"....the jaws of the chuck grasp the tenon but the pressures exerted during turning are actually supported on the shoulders where the tenon meets the body of the wood. Some of the tenons were only 1/8 long.