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Lidding a hollow form

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Lidding a hollow form

#1

Lidding a hollow form

Ray Carson - Lawrenceville, NJ

Hello Wood Central wood turners. I don't post often and haven't in quite a bit but I have been woodworking. :)

I'm currently working on a hollow form which I hope to post pictures of very soon. I'm in the process of making a very shallow or low lid with a finial and have come upon a dilemma of how to hold and turn a piece of wood about 4 1/2" in diameter, about 1 inch thick. I want to make a shoulder for it to sit in the hollow form opening and then have the finial glued into that. I'm a bit perplexed on how to hold the disc without using a four jaw chuck and leaving marks on the portion going into the hollow form. I tried using a four spur center but that was very inefficient. The four jaw chuck I have doesn't expand enough and again, I don't want to leave marks from that chuck.

What can I do?

Re: Lidding a hollow form

#2

Dennis in Southern Oregon

Re: Lidding a hollow form

Dennis in Southern Oregon

As a first thought, I would turn a chucking tenon on the outer (top) end of the blank, gluing on a bit of waste wood if necessary. Then I would fully turn and sand the bottom of the lid and around the outer part of the top. Then I would turn a tenon on another piece of waste wood, chuck it and turn a shallow straight-sided recess into which the bottom of the lid would fit snugly and stably. Then I would mount the lid between this jam chuck and the live center and carefully part off the first tenon and bring up the live center to hold the piece while finishing the top. The mark caused by the live center will be lost when you bore for the finial.

Dennis

Re: Lidding a hollow form

#3

Re: Lidding a hollow form

Walnut Les

You could try glue chucking it with a hot melt glue stick, a glue gun and a couple of scrap bits of wood will soon sort it out for you.

Re: Lidding a hollow form

#4

George Balock

Re: Lidding a hollow form 

George Balock

Typically when do a hollow form with a collar and finial, I turn the collar to fit the opening by holding the wood in a chuck and using a waste block for the part that is held by the jaws. This allows me room to undercut the rim of the collar and use a drill to drill out the opening without wasting too much wood (I like to work with Balckwood). Once the collar is finished, I will glue it into the hollow form and finish turn where the collar transitions inside the vessel. Once this is done, it is fairly easy to fit the finial to the opening. I learned this technique from an article in the AAW journal a while back. It is in 17:1:50 and is by Art Liestman. I have a PDF of it. If you send me a PM, I can send it to you.


Re: Lidding a hollow form

#5

Re: Lidding a hollow form

Ray Carson - Lawrenceville, NJ

That's exactly what I'm talking about. I thought about a waste block but was looking for alternatives. That being said, the glue joint becomes an issue though, correct? If I understand you correctly, that's what you part off? If so, how do you finish that cut? Hand sand and finish?

Re: Lidding a hollow form

#6

Re: Turning a lid for a hollow form  (oops)

Ray Carson - Lawrenceville, NJ

I just re-read your explanation. You glue the finial base to the hollow form so the need to finish the inside part is not necessary.

Re: Lidding a hollow form

#7

Dennis in Southern Oregon

Re: Lidding a hollow form

Dennis in Southern Oregon

Ray, it seems there is some confusion. Are you planning a removable lid with finial or a glued on cap with finial?

Re: Lidding a hollow form

#8

Dennis in Southern Oregon

Re: Lidding a hollow form

Dennis in Southern Oregon

Ray, it seems there is some confusion. Are you planning a removable lid with finial or a glued on cap with finial?

Re: Lidding a hollow form

#9

Re: Lidding a hollow form

Ray Carson - Lawrenceville, NJ

Hello Dennis.

No confusion on my end but I also didn't make it clear in my post. My mistake. I was going to make it a removable lid. I was given some good advice so far but welcome anything you want to add. There's always more than one way to skin a cat.

Re: Lidding a hollow form

#10

Re: Lidding a hollow form

Tom Gall

How about double-sided tape, then jam chucking or some combination of what has already been mentioned. Of course, vacuum chucking is ideal but I assume you don't have a vacuum set-up because you would have thought of that immediately!

Or, if all else fails, come pay me a visit and we can work it out. ;) I live in Hillsborough which can't be more than 20-30 minutes from you.

Re: Lidding a hollow form

#11

Keith Tompkins

Re: Lidding a hollow form 

Keith Tompkins


Hi Ray, I was trying to upload a photo, but had to adjust my preferences...Any way, I hold the lid in a chuck, and complete the bottom side of the lid, and fit the lid to the box. then I make a wood jam chuck, and draw up the tailstock to secure everything. Then turn the upper part with the knob. You can also put the box back in the chuck if it has a tenon, and hold to lid with the box, but it must be a secure fit. If my jam chuck is too tight, I just turn it away til it's very thin, and remove the lid.

Re: Lidding a hollow form

#12

Re: Jam chuck

Ray Carson - Lawrenceville, NJ

Thank you Keith

Re: Lidding a hollow form

#13

Re: Local help

Ray Carson - Lawrenceville, NJ

Wow Tom ...... thanks for the offer. :)

Re: Lidding a hollow form

#14

Re: Local help

Matt Overton

Ray, you should take Tom up on his offer, you will not be sorry. He's a great guy, and a wealth of knowledge.

Re: Lidding a hollow form

#15

Re: Local help

Tom Gall

Geez, Matt.....you made me blush! :)

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