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How to make a large wooden ring?

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Forum topic by oldnovice posted 08-16-2016 05:30 AM 815 views 0 times favorited 11 replies Add to Favorites Watch
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oldnovice

6428 posts in 3205 days


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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shipwright

7779 posts in 2635 days


#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. http://thecanadianschooloffrenchmarquetry.com/

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splintergroup

1699 posts in 1059 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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oldnovice

6428 posts in 3205 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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jbay

1857 posts in 736 days


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

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

-- If anyone would like to see my Portfolio, PM me and I would be glad to send you the link.

View gwilki's profile

gwilki

170 posts in 1310 days


#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

10628 posts in 2217 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.

-- http://thewoodknack.blogspot.com/

View DeLayne Peck's profile

DeLayne Peck

444 posts in 2038 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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Cooler

299 posts in 680 days


#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.

http://www.rockler.com/rockler-bead-cove-bits-for-canoe-building

These images show some possibilities:

https://www.google.com/search?q=bead+and+cove+boat+building&rlz=1C1RXDB_enUS585US585&espv=2&biw=1366&bih=667&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiJ4rinksnOAhWJL8AKHe4bCJUQ_AUIBygC

-- This post is a hand-crafted natural product. Slight variations in spelling and grammar should not be viewed as flaws or defects, but rather as an integral characteristic of the creative process.

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oldnovice

6428 posts in 3205 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!"

View mahdee's profile

mahdee

3828 posts in 1604 days


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

I like the veneer idea too.

-- earthartandfoods.com

View jaybarr's profile

jaybarr

3 posts in 484 days


#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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