Oval Jig - Router Forums
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post #1 of 18 (permalink) Old 06-28-2012, 08:31 PM Thread Starter
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Default Oval Jig

I need a Jig to rout the inside and outside of a 6x10 Oval. The router bit I whant to use don't have a bearing.
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post #2 of 18 (permalink) Old 06-28-2012, 08:48 PM
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http://www.routerforums.com/guide-bu...ore-ovals.html

==
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Originally Posted by woodie26 View Post
I need a Jig to rout the inside and outside of a 6x10 Oval. The router bit I whant to use don't have a bearing.



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post #3 of 18 (permalink) Old 06-28-2012, 08:54 PM
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Hi Larry.
You can either buy or make a jig for your purpose.


Rockler Ellipse/Circle Router Jig - Rockler Woodworking Tools

James
Whittier, CA.

Have a nice & safe day!
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post #4 of 18 (permalink) Old 06-28-2012, 09:07 PM Thread Starter
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Not clear if that will work for me.
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post #5 of 18 (permalink) Old 06-28-2012, 09:13 PM
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Hi

All you need is to make a oval template or use one you have a around (picture frame ) and a brass guide that will fit into your router base..no bearing needed, but I do use the magic donuts all the time to make the item bigger or smaller..

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Not clear if that will work for me.



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post #6 of 18 (permalink) Old 06-28-2012, 09:41 PM Thread Starter
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Just checked the oval isn't a true oval.
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post #7 of 18 (permalink) Old 06-28-2012, 10:01 PM Thread Starter
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Maybe I should had said that I need to rout a profile on the inside and outside of the all most oval and the bit I want to use doesn't have a bearing.
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post #8 of 18 (permalink) Old 06-28-2012, 10:35 PM
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Hi Larry,

1. The jigs shown will route an ellipse, not a true oval. There is a slight mathematical difference. Most of what we see today are ellipses, not ovals...

2. If you already have the "oval", what is the measurement between the 'inside' and the 'outside'? You may be able to make 2 male templates and use your existing bit.

3. The quickest and easiest answer is to buy the profile bit with a bearing.

Unfortunately, your profile does not show what tools and experience you have. If you gave us some more information, we may be able to help.

James
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Last edited by jw2170; 06-28-2012 at 10:37 PM.
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post #9 of 18 (permalink) Old 06-29-2012, 06:20 AM
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Hi Larry

Ovals have a large radius and a small radius so you need a jig which can handle the transition between two radii. I was going to suggest Bill Hylton's book, "Router Magic" which has a good jig plan in it, but then I came across this video on You Tube which is effectively the same thing, produces true ovals and can be made from scrap.

That jig will allow you to cut out the oval with a straight bit. You'll need to cut the outside of the oval first, shorten the arm, then cut the inside. Make sure that you fix the oval material down well with double-sided tape and "onion skin" your cuts (i.e. cut to within about 1mm or 1/16in or less of the bottom surface in a series of passes then make your last cut to full depth through that thin onion skin slowly to minimize the tendency of the workpiece to move. Personally I wouldn't try cutting it and profiling it at the same time.

To profile it you need to set-up something which can emulate an inverted pin router, such as a router table with an overhead pin. Once again Bill Hylton's book has an set of plans of how to make one, but there's also this video on YouTube of a welded arm version. I don't see why one of those couldn't be built in wood. MLCS also make their Daisy Pin Router which seems to do the job pretty well

Enjoy!

Phil

Last edited by Phil P; 06-29-2012 at 06:25 AM.
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post #10 of 18 (permalink) Old 06-29-2012, 07:17 PM
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Default Omicron Ellipsograph

I used to put an Xacto knife in this and cut ovals in contact paper.
Bought it at an estate sale in 1983. $12.
14" max oval. With a little extension, somewhat more.
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  • Accident free since 10/27/12 at 3:58 pm.
  • Cursing free since 10/27/12 at 3:59 pm.
  • ...it happened in Everett, WA USA
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