How to make a large wooden ring?

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Forum topic by oldnovice posted 08-16-2016 05:30 AM 431 views 0 times favorited 11 replies Add to Favorites Watch
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08-16-2016 05:30 AM

Topic tags/keywords: question

I need a 15-1/2” inside diameter, 5 ” tall ring with the outside diameter not being that critical!
Obviously I think about wood first but, kerfing one side for all 50+ inches, seems like a lot of error prone work.

If kerfing is the obvious choice, how do I calculate the kerf?

I am also open to other suggestions?

-- "I never met a board I didn't like!"

11 replies so far

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#1 posted 08-16-2016 02:45 PM

What is the application?
If the inside doesn’t need to be a smooth circle, birds mouth joints would work well.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fibreglass trees.

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743 posts in 647 days

#2 posted 08-16-2016 03:05 PM

The height is a bit of a challenge, but for something like that the first thing I think of is rings of glued up trapezoids (probably 8 per ring). Each ring is glued to another, offset by 1/2 segment for strength. A router with a circle template would get the inside (and outside if needed) perfectly round to a precise dimension. I’d probably do the routing on two-layer (1-1/2” for 3/4” stock) to keep within the capacity of a typical bit. Basically this is how segmented vase turnings start out.

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5656 posts in 2792 days

#3 posted 08-16-2016 06:48 PM

It is going to be the duct for a 15 inch propeller that is part of a wind tunnel, an EDF, Electric Eucted Fan.

-- "I never met a board I didn't like!"

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#4 posted 08-16-2016 06:57 PM

I know it funner to make but if interested here's where you can buy one

-- Many times my “MO” involves Judging others, playing God, acting as LJs law enforcement, and never admitting any of my ideas could possibly wrong or anyone else's idea could possibly be correct.--

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#5 posted 08-16-2016 08:11 PM

How smooth does the inside need to be? Do you have access to a lathe?

Since I do have access to a lathe, I would simply cut staves 5” tall, and glue them into a ring/short column. I would go with 12 staves to keep the angle easy to cut and to keep gluing easy. Each stave is cut at 15° (360°/12/2).

With a lathe, it’s a simple matter to round the inside and outside. Without a lathe, you would have to decide if the flats would cause airflow issues.

-- Grant Wilkinson, Ottawa ON

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Rick M.

7736 posts in 1804 days

#6 posted 08-17-2016 01:17 AM

You are basically making a drum shell. My first thought was make a round form and coil a sheet of veneer several layers thick, or however many layers you feel is necessary.


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DeLayne Peck

423 posts in 1626 days

#7 posted 08-17-2016 08:29 AM

I’d think about a thin clear plastic sheet. Clear plastic because you can overlap ends together and weld right through the sheets with UV activated plastic, like Bondic. As Mike suggests you could wrap and weld additional layers for greater rigidity.

I have used it in my shop for small plastic repairs with good results. Available at ACE Hardware.

-- DJ Peck, Lincoln Nebraska. Lord, keep your arm around my shoulder and your hand over my mouth.

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#8 posted 08-17-2016 07:04 PM

Bead and Cove router bits. First run the long strakes than cut to length. Glue up. Piece of cake.

These images show some possibilities:

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5656 posts in 2792 days

#9 posted 08-17-2016 11:01 PM

Right now I am leaning towards the veneer wrap but the plastic wrap looks intriguing too!

-- "I never met a board I didn't like!"

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3470 posts in 1192 days

#10 posted 08-17-2016 11:20 PM

I like the veneer idea too.


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#11 posted 08-18-2016 06:03 AM

You could check instructables, I used that website a lot whenever I was in a fix.

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