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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?
"We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm"
Winston Churchill
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I make my recesses slightly shallower than the length of the jaws. The tip of the jaw should bottom out in the work.
We do segmented turning, not because it is easy, but because it is hard.
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11-15-2018, 11:13 AM
(This post was last modified: 11-15-2018, 11:16 AM by MichaelMouse.)
(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.
Better to follow the leader than the pack. Less to step in.
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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.
As of this time I am not teaching vets to turn. Also please do not send any items to me without prior notification. Thank You Everyone.
It is always the right time, to do the right thing.
