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Re-chucking roughed out bowls

Last year I made some small bowls using fruitwood that I rough-turned green and then finish-turned when dry. I used a dovetail expansion chuck to hold the wood.

Recently, I rough-turned some green acacia also using the dovetail expansion chuck, But now that the wood is dry, the round depression that I used for the chuck is quite oval in shape and I just don't think that my Super Nova will hold it. How do it get a grip on the damn things? Or, another question, how do I make the oval depression round again?

Any answers would be greatly appreciated.

Martin Cohn

Reply to
Martin Cohn
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"Martin Cohn" skrev i melding news: snipped-for-privacy@posting.google.com...

You can try lining them up between centers with the "oval" towards the tailstock. Then you can "reround" the chuckhold with a parting tool or something. Worked fine for me, until I invested in a drillpress and a 1" forstnerbit.

Bjarte

Reply to
Bjarte Runderheim

"until I invested in a drillpress and a 1" forstnerbit."

I like the idea of the 1" forstener bit. Once the hole is made do you insert a spigot or do you have an expansion mandrel?

Reply to
Denis Marier

"Denis Marier" skrev i melding news:V8BJb.51024$ snipped-for-privacy@ursa-nb00s0.nbnet.nb.ca...

Hole 3 - 5mm deep. Insert a Talon or other scrollchuck. Fasten.

Bjarte

Reply to
Bjarte Runderheim

Sorry for the bother Bjarte. It may be my lack of experience but I cannot have a positive image of what you are doing. I see three 1? holes bored at 5MM deep equally spaced on a circle. Then the scrollchuck is inserted. I imagine that the three 1? dia pins are part of the scroll chuck. Or some other devices are used?

Reply to
Denis Marier

I believe Bjarte is referring to a hole that is 3 to 5 mm deep. Not three holes, five mm deep.

Reply to
Leif Thorvaldson

I got side tracked when I read "Worked fine for me, until I invested in a drillpress and a 1" forstnerbit." What I have is a clock forstner bit of 3". I use it according to the need in situ. Because of my cheap scroll chuck I prefer to use a tenon instead of a mortise (hole).

In Martin's case I would hold the small bowl between center and use a dovetail chisel to thru the mortise. The other way would be (subject to the material left) to hold the small bowl between center and cut a tenon to suit. When holding between centers make sure that a small hole has been drilled to identify the centers of blank on each side. If a 3" forster bit is available and there is enough material you may want to try it on the drill press. Make sure that the blank is centered with a pilot hole matching the forstner bit and firmly clamped to the table. Others may have better method of doing it.

Reply to
Denis Marier

Reply to
Denis Marier

Put your chuck on the lathe and tighten the jaws. Then Jam chuck the oval bowl blank over the chuck applying pressure to the blank with the tail stock. Bottom of bowl toward the tail stock. Then you turn the tennon or spigot round reverse the bowl and go to work.

Greg Jensen

Reply to
Greg Jensen

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