Better Success with Jam-Chucking
I've helped a few woodworkers who have had problems when working with a jam chuck. This three-step process might help you be more successful.
Step 1: Turn a jam chuck with a small tenon that fits inside the bowl. Turn the outside diameter of the jam chuck so the diameter matches the outside diameter of the bowl.
Step 2: Fit the bowl over the tenon and apply pressure with the tailstock. For added security and anti-slip protection, wrap the joint between the bowl and jam chuck with masking tape.
Step 3: With the foot turned, leave the masking tape in place but back off the tailstock. Slow the lathe speed and turn away the nub. When removing the nub, use light cuts that apply pressure toward the center of the form and toward the headstock. Then sand the bottom.
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