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Josh, why wouldn't you use a tailstock? You can use a piece of scrap and put it in your lathe chuck and make it domed shaped and use a soft piece of towl or washcloth to hold the inside of the bowl and use the tailstock in the center of the bottom. You don't have to turn it fast to true up the tenon. Then just reverse it and put the tenon in the chuck.
Not sure what you are asking.
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If the piece is too big to fit over the bed, is what he is asking.
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If you have to true up the blank outboard, you are going to have to get creative. A donut chuck is probably the best way. Something like an overgrown Cole jaws could work. Or a monster vacuum chuck. Or rig an outboard tailstock. Or borrow use of a bigger lathe. Etc. Depends on the shape and thickness of your blank -- what you have to work with.
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Not to hijack this thread but I was wondering what you guys use to hold a large bowl or platter to remove the bottom? Do you make larger size jumbo jaws or use another method? :confused:
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Josh;
Larger blanks turned and finished on the outboard side without a tailstock do call for creative solutions. The donut chuck is probably the easiest for whatever you can't grab with the chuck, provided you have a chuck that will fit on your outboard side. If the chuck is not available a glue block and faceplate along with donunt type chucks actually work pretty well allowing you to hold from each end and finish off the piece.
Just a note, I've never used a donunt chuck with shrink wrap, sounds creative but I just don't know if I would trust it or not.