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+-- Thread: Need help turning a base (/showthread.php?tid=7344355)
Need help turning a base - joemac - 11-14-2018
I am turning my first base. It is 4" round and about 3/4" thick. I cut it "round" on a bandsaw then used a Coles chuck to flatten what will be the bottom and create a slight hollow so I can turn it around and mount it on a chuck with expanding jaws which will go inside that hollow I made. My question is, how deep should that hollow be so I can get a grip on it with expanding jaws?
RE: Need help turning a base - SceneryMaker - 11-14-2018
I make my recesses slightly shallower than the length of the jaws. The tip of the jaw should bottom out in the work.
RE: Need help turning a base - MichaelMouse - 11-15-2018
(11-14-2018, 06:30 PM)joemac Wrote: I am turning my first base. It is 4" round and about 3/4" thick. I cut it "round" on a bandsaw then used a Coles chuck to flatten what will be the bottom and create a slight hollow so I can turn it around and mount it on a chuck with expanding jaws which will go inside that hollow I made. My question is, how deep should that hollow be so I can get a grip on it with expanding jaws?
Do not go too deep if you're using dovetail jaws, but try to match the opening size to the first point of circularity - small. Eighth of an inch, maybe. See my post to the chuck advise thread for example. Depends on your downhill skills and the design you're after. A "first" suggests K I S S edge, so remember to cut downhill, and snub the tailstock up to protect against a snag.
Your Cole Jaws are not, in my opinion, the right start. Pin jaws/chuck if deep, are much easier to work with, and no second mount necessary, depending on design.
RE: Need help turning a base - Arlin Eastman - 11-15-2018
What both of them said. It does not need to be deep just enough to grip and let the wood seat properly against the jaws.
I have made mine from 1/8" to 3/8" but it was depending on how big and material I was turning.
I can not wait to see what you are working on.
