LumberJocks

Easily Adjustable Router Circle Jig

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Project by Marv88 posted 05-02-2015 02:49 AM 2003 views 17 times favorited 7 comments Add to Favorites Watch

I thought I had already posted this one to my projects here but I guess I didn’t so here it is! I frequently cut circles of different sizes so I made this to replace my previous worn out jig and upgraded it with some added features. The router is a Porter Cable 890 series plunge base with through the post dust collection that works extremely well and I use a 3/8” solid carbide up cut spiral bit in a zero clearance hole to stop splintering. One of the main issues I had with the previous version was that as the slot wore out/got sloppy the bit would chatter causing a lot of sanding. To remedy this I made mating grooves in the base/pivot pin assembly and glued 1/8” smooth 2 sides hardboard in the pin assembly which virtually eliminated any side to side movement leaving perfect holes (I got this idea from a thin strip ripping table saw jig I saw here I believe). The pivot pin is a cut off 1/4” bolt with threads tapped directly into the multi ply birch and not shown is a set screw drilled into the end to keep it from backing out. I didn’t want to make this jig as long as the old one but wanted to keep the range so I came up with the idea of a reversible pivot pin assembly with 3 locking bolt locations. This allows a range of about 2 1/2” – 28” depending on which hole is used and which way the assembly is positioned (if I need bigger I can make a longer pivot pin assembly). One of the best features is the tape measure and cursor (made by bending a thin piece of plexiglass) which makes it quick/easy to change sizes with no measuring. Also, the bottom is covered in some scrap Formica with a textured surface that allows it to move smoothly.

-- "Post count on a forum does not denote level of knowldege, skill nor experience"





7 comments so far

View J2Jonner's profile

J2Jonner

5 posts in 604 days


#1 posted 05-02-2015 03:45 AM

wow.. that is an impressive shop fixture! Best compliment I can give you – I tagged this and am filing it away to copy someday!

View Marv88's profile

Marv88

74 posts in 1359 days


#2 posted 05-02-2015 04:18 PM

Thanks and hope it works out well for you!

-- "Post count on a forum does not denote level of knowldege, skill nor experience"

View MarkTheFiddler's profile

MarkTheFiddler

2053 posts in 1648 days


#3 posted 05-02-2015 06:18 PM

Nicely done. Thanks for sharing and explaining.

-- Thanks for all the lessons!

View Marv88's profile

Marv88

74 posts in 1359 days


#4 posted 05-02-2015 06:38 PM

Thanks Mark and you’re welcome!

-- "Post count on a forum does not denote level of knowldege, skill nor experience"

View Redoak49's profile

Redoak49

1936 posts in 1448 days


#5 posted 05-03-2015 12:23 AM

Very nicely done

View Gregg M.'s profile

Gregg M.

170 posts in 1142 days


#6 posted 02-10-2016 09:32 PM

Appreciate your post. I made one of these.

-- Marvel Woodworking, West Chester, PA - http://www.MarvelWoodworking.com

View Marv88's profile

Marv88

74 posts in 1359 days


#7 posted 02-10-2016 10:20 PM



Appreciate your post. I made one of these.

- Gregg M.

Glad you found it useful Gregg and hope the jig works out well for you!

-- "Post count on a forum does not denote level of knowldege, skill nor experience"

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