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Idea for a circle jig

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Forum topic by mIps posted 645 days ago 1591 views 0 times favorited 12 replies Add to Favorites Watch
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mIps

172 posts in 657 days


645 days ago

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

1390 posts in 963 days


#1 posted 645 days ago

Try it and see.

-- Clint Searl.............We deserve what we tolerate

View peterbb's profile

peterbb

36 posts in 889 days


#2 posted 645 days ago

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

View mIps's profile

mIps

172 posts in 657 days


#3 posted 645 days ago

- 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.

View jap's profile

jap

1224 posts in 656 days


#4 posted 645 days ago

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

-- Joel

View NiteWalker's profile

NiteWalker

2709 posts in 1179 days


#5 posted 645 days ago

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.

View denversigmon's profile

denversigmon

5 posts in 645 days


#6 posted 645 days ago

i am not understating what the work do wood machine

-- Denver Sigmon

View a1Jim's profile

a1Jim

112000 posts in 2179 days


#7 posted 645 days ago

View Cosmicsniper's profile

Cosmicsniper

2199 posts in 1761 days


#8 posted 645 days ago

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

View peterbb's profile

peterbb

36 posts in 889 days


#9 posted 645 days ago

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 1761 days


#10 posted 645 days ago

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

536 posts in 1102 days


#11 posted 644 days ago

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

155 posts in 790 days


#12 posted 382 days ago

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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