Radius Fixture for Plunge Router

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Project by Jim Jakosh posted 09-07-2012 06:31 PM 3848 views 15 times favorited 21 comments Add to Favorites Watch

I have a project in progress that is going to require some slots routed in a curved arc so I stopped to build this addition to my plunge router to swing and cut on a curve. I added some features for the future for most any size up to 12” radius. I made the base to fit the router out of 3/8” Lexan and cut a hole in the center to match the one that accepts the standard bushings. I also made a plug for the center from which to measure with a tape or a caliper to set the radius very accurately. The screw body for the pivot center is turned to .200” as is the pin on the center insert. You just add .200” to the radius you want and set it with big digital caliper.

The adjustable extension is made from 5/8” maple plywood and is threaded for 1/4-20 screws.
. I need to come up with stops for the arc. I may just clamp blocks next to the base for the router to bump or eyeball it through the clear base. The maple is coated with clear matte spray finish.

It is simple but effective. It really works slick…..................Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

21 comments so far

View jack1's profile


2167 posts in 5309 days

#1 posted 09-07-2012 06:35 PM

Those work good. I’ve got something like that. Good idea.


-- jack -- ...measure once, curse twice!

View Jamie Speirs's profile

Jamie Speirs

4168 posts in 4138 days

#2 posted 09-07-2012 07:02 PM

Jim very neat

My method is VERY basic :)

Carpet tape & a nail. I should take

your lead.


-- Who is the happiest of men? He who values the merits of others, and in their pleasure takes joy, even as though 'twere his own. --Johann Wolfgang von Goethe

View Dusty56's profile


11866 posts in 4970 days

#3 posted 09-07-2012 07:31 PM

Very nice jig, JJ. Added to my favorites . Thank you for sharing it with us : )

-- I'm absolutely positive that I couldn't be more uncertain!

View Joe Lyddon's profile

Joe Lyddon

10963 posts in 5334 days

#4 posted 09-07-2012 07:53 PM

Very Flexible…

COOL design…

Thank you.

-- Have Fun! Joe Lyddon - Alta Loma, CA USA - Home: ... My Small Gallery:

View RussInMichigan's profile


600 posts in 4062 days

#5 posted 09-07-2012 09:08 PM

Nice jig, Jim.

View Jim Jakosh's profile

Jim Jakosh

26997 posts in 4387 days

#6 posted 09-07-2012 10:21 PM

Thanks for the nice comments. I heard they sell something like this but you appreciate it more if you make it yourself. Ijust used in on the job i had for it and it worked just super!!!!!!!!!!!!!!

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View Roger's profile


21055 posts in 4086 days

#7 posted 09-07-2012 11:05 PM

That looks like a paddle that a teacher used on me in 6th grade… Really tho, Jim, very awesome jig. Nice build

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed. [email protected]

View Jim Bennett's profile

Jim Bennett

17 posts in 3405 days

#8 posted 09-08-2012 02:02 AM

Love this. Simple, straight forward, works everytime.
Thanks, Jim

-- Jimmy, Upstate NY in the summer, somewhere south in the winter (on the boat).

View sedcokid's profile


2738 posts in 4880 days

#9 posted 09-08-2012 02:22 AM

Very Creative Jim,

Thanks for sharing

-- Chuck Emery, Michigan,

View LeslieC's profile


152 posts in 3380 days

#10 posted 09-08-2012 03:04 AM

That’s pretty ingenious.

-- There is nothing like a Grateful Dead concert.

View harry1's profile


538 posts in 3567 days

#11 posted 09-08-2012 03:12 AM

Once again Jim, beautifully made BUT! isn’t it just a complicated circle jig?

-- Harry, Western Australia

View Doghouse77's profile


9 posts in 3784 days

#12 posted 09-08-2012 03:29 AM

I like the idea with the bushing to aid in getting the dia. or radius dead on !

-- The reason a dog has so many friends is because he wags his tail instead of his tongue."- author unknown.

View Ivan's profile


17046 posts in 4149 days

#13 posted 09-08-2012 12:33 PM

You have very practical ideas.I’m sure I will use them and adjust them to my needs.

-- Ivan, Croatia, Wooddicted

View TimWood's profile


196 posts in 3523 days

#14 posted 09-08-2012 12:57 PM

+1 on the added to favorites….nice design. I LIKE the two logs in the background in the 4th and 6th photo that has the light and dark wood…what are they?

-- Tim Harrelson

View Jim Jakosh's profile

Jim Jakosh

26997 posts in 4387 days

#15 posted 09-08-2012 01:27 PM

Hi doghouse77. I found that to be great yesterday. I had to make a 7 7/8 radius so I adjusted it to 8.075 and it cut right on!

Harry, you’re right, it is just a circle cutter and I guess there are lot of way to do it, but I had this nice piece of Lexan that I can see through to the work. and it is bored just like the original router base to accept the Porter Cable bushings and that sweet little inset that I can measure to real accurately.

Tim, those logs in the background are mesquite from Arizona. They have not told me what they wanted to be yet!!

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

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