Router Mortise Jig, Junior

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Project by Holbs posted 06-23-2014 02:02 AM 5195 views 13 times favorited 4 comments Add to Favorites Watch

Here is my Router Mortising Jig for smaller pieces. 12”w x 12”h. I wanted a jig to do both vertical and horizontal 90 degree pieces all in one with the added benefit of any angle in between. Hence, I came up with the pie slice idea that can be rotated 90 degrees, and also has adjustable height of 4” up and down. The router will always be using the MicroFence wooden fence so I made the fence sandwich tightly (but not inhibiting sliding motion) between 2 UMHW pieces with a 1/8” upper lip for retention. Added a 1/8” lip on the front side as well for board registration.
This is the first time using true Baltic Birch ply. Found out rather quickly, 3/4” Baltic Birch plywood is not exactly 3/4” but 18mm :) Makes a big difference when doing rabbets you want to fit snugly to know this. Oh, this was also the first time using dado’s and rabbets 100%. No screws were used for joinery. Alot of mistakes went into this small and simple jig, but they were learning experiences for other projects down the road. I had to use Sketchup , Incra 18” rule, and 12” dial caliper to ensure my measurements were perfect down to a 1/64th of an inch for I have a serious problem making critical and stupid mistakes when it comes to marking and measuring.

PS: because of the 12”x12”, I had to use 3 inset screws. 2 for horizontal use and if I want to rotate the platform, I have to un-screw the top knob and move it to the inset screw 4” higher. And I had to but out 2” or so of the 1/8” UMHW lip uptop to give room when the platform rotates.

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter "xylokopos/ξυλοκὀπος"

4 comments so far

View scoobydooo9r's profile


187 posts in 5059 days

#1 posted 06-23-2014 07:02 AM

Great job! It’s amazing how much design work & engineering go into jigs. If you make the jig properly, then your parts will always come out perfect. Can’t wait to see it in action

-- I don't make mistakes, I make design challenges!

View geekwoodworker's profile


378 posts in 2744 days

#2 posted 06-23-2014 08:09 PM

Nice jig.

You should check out the slot mortiser at woodgears. I made one and love it. Its fairly large but can still be stowed away in a corner.

View Holbs's profile


2383 posts in 3313 days

#3 posted 06-24-2014 12:18 AM

I first crossed paths with woodgears and Matthias when I was researching possibilities for garage shelving. I did follow his route for cantilever shelves which worked beautifully. One day, I may venture into his slot mortiser and quick set tenon jig, but they are #57 and #58 on my wood shop to do list :)

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter "xylokopos/ξυλοκὀπος"

View timbertailor's profile


1594 posts in 2707 days

#4 posted 09-23-2014 10:27 PM

These are great learning projects. No one else will see them but you and they have a use after you are done.

Hope it works well for you.

-- Brad, Texas,

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