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How to turn an oval

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Forum topic by grafiks posted 06-04-2014 07:59 PM 929 views 2 times favorited 14 replies Add to Favorites Watch
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grafiks

4 posts in 206 days


06-04-2014 07:59 PM

Hello,
I am new to the forum and have a project that I need some advice on. I am making some wooden tools to use making jewelry. Will be working with copper and silver mostly. This is a mandrel used to make bracelets that I want to duplicate out of wood

. I would appreciate any ideas on how to make this. It is 8 1/2” long, largest part of oval 2 1/4” x 2 1/2” and the smallest part is 1 5/8” x 1 7/8”. I want to use hard wood, persimmon or beech.
Thanks,
Bob
Banner Elk, NC


14 replies so far

View mrjinx007's profile

mrjinx007

1833 posts in 522 days


#1 posted 06-04-2014 08:13 PM

Welcome to LJ’s. I doubt it can be done like that. You could make each individual ovals separately out of solid wood by turning the and then trimming the corners with a router.

-- earthartandfoods.com

View mtenterprises's profile

mtenterprises

839 posts in 1447 days


#2 posted 06-04-2014 09:21 PM

I know there is a way to lathe turn it but i cannot remember where I have seen it. The only thing that comes to mind is Rose Engine Lathe but they are few and far between. I’m sure someone else on here will have the answer.
MIKE

-- See pictures on Flickr - http://www.flickr.com/photos/44216106@N07/ And visit my Facebook page - facebook.com/MTEnterprises

View SASmith               's profile

SASmith

1637 posts in 1741 days


#3 posted 06-04-2014 09:36 PM

I think what you need is an oval/elliptical chuck.

More info on oval turning here.

-- Scott Smith, Southern Illinois

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FellingStudio

55 posts in 437 days


#4 posted 06-04-2014 11:03 PM

This is not really that hard guys … it can be done with a simple spur drive.

Starting with a square blank, first mark the center of both ends by drawing straight lines corner to corner. Next mark points on one of your diagonals that are an equal distance from the center point. Mount on the lathe on the center points and turn the blank round. Mount on the lathe using one set of your off center points, and cut away half of the remaining wood. Mount on the lathe using the other set of your off center points, and cut away the remaining wood. You now have an oval.

Basically you are turning the wood three times on parallel axes.

-- Jesse Felling - http://www.fellingstudio.com

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grafiks

4 posts in 206 days


#5 posted 06-04-2014 11:47 PM

Thanks for all of the replies. Looks like a special chuck may be in my future.
Bob

View Wolfdaddy's profile

Wolfdaddy

263 posts in 588 days


#6 posted 06-05-2014 12:00 AM

There’s some great info about multi axis turning here: http://www.barbaradill.com/paper.html>

-- Your failures do not take away your possibilities.

View REO's profile

REO

674 posts in 828 days


#7 posted 06-05-2014 12:15 AM

for one off jesse nailed it. unless you have an oval turning chuck (very expensive) or want to build one. the OT lathe will do it to but then that is an additional piece of equipment to buy for a one off.

View Mip's profile

Mip

338 posts in 832 days


#8 posted 06-05-2014 12:59 AM

Vicmarc makes an oval chuck to fit on a lathe, but the downside is the cost: $2600! I think that would be an awful lot to pay to make one little oval mandrel. I would go with FellingStudio’s idea.

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bondogaposis

2765 posts in 1105 days


#9 posted 06-05-2014 01:53 AM

FellingStudio nailed it, it can be done easily using a technique called offset turning, no fancy equipment required. Here’s a link to how Roy does it.

-- Bondo Gaposis

View Rick M.'s profile (online now)

Rick M.

4518 posts in 1134 days


#10 posted 06-05-2014 03:58 AM

If I remember correctly, Roy also covers the math to get the oval you want rather than just guessing.

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

View TheFridge's profile

TheFridge

1031 posts in 240 days


#11 posted 06-05-2014 04:39 AM

Damn. That is a good idea.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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ScrubPlane

187 posts in 950 days


#12 posted 06-15-2014 03:24 AM

I did one of these for my Mother a couple of years ago. Mine didn’t come out as good as the one in the video but the technique is fairly simple and doesn’t require any special tools or complicated geometry.

https://www.youtube.com/watch?v=cDq5oHVD294

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grafiks

4 posts in 206 days


#13 posted 06-17-2014 01:56 AM

ScrubPlane
Thanks for the suggestions and youtube. My friend glued up some stock and turned an oval today. It worked great. He was going to try to build a jig and use a router but this is much easier. We want to sell these to people that make jewelry to use as a bracelet mandrel.
Thanks again for your post.
Bob

View Richard Hillius's profile (online now)

Richard Hillius

158 posts in 435 days


#14 posted 06-17-2014 02:05 AM

The Woodwright Shop has a episode on turning oval mortise chisel handles that explains the layout really well. Check out PBS’s website, it should be there to watch.

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