Drive Center for Roughing Bowls
I made this big drive center that I sometimes use for the initial roughing out of bowls. A standard drive center just won’t work for larger pieces or wet wood.
I rough between centers when I want to reposition the blank to center the grain, avoid (or highlight) a defect, etc. Or for times when I don’t have a good surface for a screw chuck, or when the wood just won’t hold a screw for some reason.
I started with a 3″ faceplate and added 5 bolts. The faceplate had a center hole so it could be used as a screw chuck. So one bolt went in there, and 4 others around the outer holes. I sharpened the ends of the bolts to a point (chuck it in a drill and spin it against a bench grinder). The center point is a bit longer than the others, which helps with initial positioning and keep the thing where it should stay.