Radius Fixture for Plunge Router

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Project by Jim Jakosh posted 712 days ago 2270 views 14 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


1912 posts in 2651 days

#1 posted 712 days ago

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


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

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Jamie Speirs

4109 posts in 1481 days

#2 posted 711 days ago

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


11643 posts in 2312 days

#3 posted 711 days ago

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!

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Joe Lyddon

7675 posts in 2676 days

#4 posted 711 days ago

Very Flexible…

COOL design…

Thank you.

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

View RussInMichigan's profile (online now)


471 posts in 1405 days

#5 posted 711 days ago

Nice jig, Jim.

View Jim Jakosh's profile

Jim Jakosh

11277 posts in 1730 days

#6 posted 711 days ago

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


14311 posts in 1428 days

#7 posted 711 days ago

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.

View Jim Bennett's profile

Jim Bennett

17 posts in 748 days

#8 posted 711 days ago

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


2667 posts in 2223 days

#9 posted 711 days ago

Very Creative Jim,

Thanks for sharing

-- Chuck Emery, Michigan,

View LeslieC's profile


147 posts in 722 days

#10 posted 711 days ago

That’s pretty ingenious.

-- There is nothing like a Grateful Dead concert.

View harry1's profile


512 posts in 909 days

#11 posted 711 days ago

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

-- Harry, Western Australia

View Doghouse77's profile


8 posts in 1127 days

#12 posted 711 days ago

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 majuvla's profile


3305 posts in 1492 days

#13 posted 711 days ago

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


176 posts in 866 days

#14 posted 711 days ago

+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

11277 posts in 1730 days

#15 posted 711 days ago

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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