Router Mortising Jig

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Blog entry by HungryTermite posted 02-08-2010 08:16 AM 7967 reads 9 times favorited 11 comments Add to Favorites Watch

I saw a post on here at one point, and also in an old issue of shopnotes about a mortising jig for my plunge router that seemed quick and easy. Since I need to cut a bunch of mortises for the blanket chest I am making I figured I would make one. I made some slight changes to it by using acrylic instead of hardboard and I used fender washers under the wing nuts. The runners were made from scrap maple which was sanded smooth and coated with a few coats of wipe on poly.

It seems to sit on the edge of a 3/4” thick board ok but is a tad wobbly. Also, if I get the runners nice and close so the bit can’t wander from side to side, it is a little hard to move. I have some extra UHMW sheet laying around so I might add some to the face of the runners to see if that helps. For now it works good enough for what I need it to do. I picked up a spiral upcut bit from rockler to use with the jig to make the 3/8” mortises for the chest.

Mortise Jig #1

Mortise Jig #2

-- Good Judgement Comes From Experience. Experience Comes From Bad Judgement.

11 comments so far

View a1Jim's profile


113818 posts in 2664 days

#1 posted 02-08-2010 08:21 AM

Good jig HT

-- Custom furniture

View OutPutter's profile


1199 posts in 3077 days

#2 posted 02-08-2010 08:25 AM

Cool jig. Did you wax the runners on the sides? I’ve used a spray on silicone to increase the slippery on my jigs before too.


-- Jim

View HungryTermite's profile


90 posts in 2136 days

#3 posted 02-08-2010 08:27 AM

Hey, good idea OP. I didn’t think of that. I think I need to make the runners slightly taller to fix th wobble and I can wax them with all the leftover wax I have for the tablesaw!

-- Good Judgement Comes From Experience. Experience Comes From Bad Judgement.

View kerflesss's profile


182 posts in 2455 days

#4 posted 02-08-2010 09:20 AM

Nice jig!

View jockmike2's profile


10635 posts in 3333 days

#5 posted 02-08-2010 01:21 PM

Why do you guys always got to make my jigs look like something that crawled out of the scrap bin. Nice looking jig, I’m just jealous, mike

-- (You just have to please the man in the Mirror) Mike from Michigan -

View Scott Bryan's profile

Scott Bryan

27251 posts in 2909 days

#6 posted 02-08-2010 02:02 PM

This is a nice jig that you have built.

-- Challenges are what make life interesting; overcoming them is what makes life meaningful- Joshua Marine

View richgreer's profile


4541 posts in 2161 days

#7 posted 02-08-2010 03:34 PM

That’s a great looking jig. The acrylic is a really good idea – one that I will remember.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

View HokieMojo's profile


2103 posts in 2815 days

#8 posted 02-09-2010 10:22 PM

outputter, won’t the silicone spray interfere with finishing? I’ve hear it causes nightmares. your projects don’t appear to have suffered any, but I’d love to hear your thoughts on this.

View OutPutter's profile


1199 posts in 3077 days

#9 posted 02-10-2010 08:20 AM

The silicone spray I use is like a flat black paint but slick as whale snot. I use it on the parts of my jigs that touch other wood or metal like my crosscut sled for the old Craftsman. I “painted” the underside of the sled and the inside of the runners, you just can’t see it from the pictures. There was no finish on the top. Come to think of it though, I do have nightmares sometimes so maybe next time I’ll wear gloves and a mask. LOL

-- Jim

View bigike's profile


4047 posts in 2375 days

#10 posted 02-10-2010 04:02 PM

nice i made one of these too and it works perfect.

-- Ike, Big Daddies Woodshop,

View HokieMojo's profile


2103 posts in 2815 days

#11 posted 02-10-2010 07:17 PM

thanks. thats interesting stuff.

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