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Idea for a circle jig

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Forum topic by mIps posted 10-21-2012 09:52 PM 1785 views 0 times favorited 12 replies Add to Favorites Watch
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mIps

175 posts in 809 days


10-21-2012 09:52 PM

Topic tags/keywords: jig question router

Okay, on this one I’m looking for a sanity check, so here goes. I am wanting to make a circle jig for my router in anticipation of making some discs for other things (EVIL LAUGH). However, in at least one case, the discs I will need to make will be SMALLER than the diameter of the router base.
So, my thought was to make a circle jig with a indexer with a vaguely + shaped cross-section but a roughly “L” shaped profile so that the center pin can go under the router base, allowing for the smaller circles.
Does this seem plausible or will it all end in ruin?

-- Be honest, honorable, kind, work hard, and generally be awesome.


12 replies so far

View Clint Searl's profile

Clint Searl

1479 posts in 1116 days


#1 posted 10-21-2012 10:01 PM

Try it and see.

-- Clint Searl....Ya can no more do what ya don't know how than ya can git back from where ya ain't been

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peterbb

36 posts in 1042 days


#2 posted 10-21-2012 10:41 PM

Here’s a couple of pictures of my circle jig – it will do circles from tiny to huge.

The pivot is a #4-40 screw in one end of the slider (barely visible in these picturees). The slider can be installed either way around, depending on the size of circle you want to cut. If you plan ahead, you can make the ranges of the various T-bolt positions overlap.

-- Peter

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mIps

175 posts in 809 days


#3 posted 10-21-2012 11:19 PM

- Peter: How is your base built? That looks like it might be just the ticket.

-- Be honest, honorable, kind, work hard, and generally be awesome.

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jap

1240 posts in 809 days


#4 posted 10-22-2012 12:28 AM

this jig looks good http://www.leevalley.com/en/wood/page.aspx?p=40970&cat=1,43000 or you could build something simeler

-- Joel

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NiteWalker

2710 posts in 1331 days


#5 posted 10-22-2012 03:58 AM

mIps, here's the plans. Scroll down a bit for it.

It’s a great design.

-- He who dies with the most tools... dies with the emptiest wallet.

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denversigmon

5 posts in 798 days


#6 posted 10-22-2012 04:10 AM

i am not understating what the work do wood machine

-- Denver Sigmon

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a1Jim

112943 posts in 2332 days


#7 posted 10-22-2012 04:16 AM

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Cosmicsniper

2199 posts in 1913 days


#8 posted 10-22-2012 04:41 AM

Here’s my circle jig I recently made for my DeWalt trim router. The principal is the same as Peter’s version, allowing the pivot pin to be underneath the router itself. The single 1/4” hole in this image holds a 1/4” pin.

Here is the top side, with the adjustment bolts…

This is a prototype version for me. I will be making something similar out of thick acrylic with an adjustment push/pull pin for fine tuning the circle radius.

-- jay, www.allaboutastro.com

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peterbb

36 posts in 1042 days


#9 posted 10-22-2012 05:03 PM

The base of my jig is 1/2” plywood with a dado to suit the slider, and a slot for the T-bolt. The slider is about 3/4 wide by 3/16 thick, and as long as desired. It was likely inspired by the plans posted by NiteWalker (don’t recall the actual source…)

The jig shown by Comicsniper looks excessively thick to me – I don’t think I could cut through 3/4” material with it.

-- Peter

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Cosmicsniper

2199 posts in 1913 days


#10 posted 10-22-2012 05:32 PM

Peter. Yeah, mine bottoms out around 3/4”, but mine isn’t designed to be used on thick stock. 1/4” plywood would be completely satisfactory and would have the same depth as your jig.

-- jay, www.allaboutastro.com

View Sylvain's profile

Sylvain

590 posts in 1254 days


#11 posted 10-23-2012 12:39 PM

Jig for very small circle (0” [inside] up to about 11”)
added bonus : no pin hole

http://www.lescopeaux.asso.fr/Techniques/Docs/Sante_Tripode_Anglais.pdf

-- Sylvain, Brussels, Belgium, Europe - The more I learn, the more there is to learn

View dclark1943's profile

dclark1943

175 posts in 942 days


#12 posted 07-12-2013 02:28 PM

Sylvain, Just what I need, I am building a wedding box, and need two overlapping circles to represent the wedding bands. can’t have a center hole, and need to cut contrasting wooden circles to inlay into the routed circles.

-- Dave, Kansas City

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