Self Centering Mortise Jig

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Project by HankLP posted 11-24-2018 06:41 AM 2142 views 7 times favorited 8 comments Add to Favorites Watch

This jig will mount in an end vise or moxon vise, or the inexpensive clamp on vises shown here. The router plate is 1/4” MDF, and the rails are 3/4” ply. There are two 3/8” dowels stubbed out of the bottom of the plate which follow the grooves routed in the guide rails – one on each side of the work piece. The work piece is clamped between the guide rails, and the tops of all three pieces made tight and even. The router has a plunge base, but the fixed base is more compact, and easier to work with as the router is held steady by the guide pins. The test pieces were “slapped” together in 10 minutes. The tenon cheeks were cut out on the on the table saw with a miter gauge, and all fit up tight and square.

I just purchased the Grizzly T27139 trim router for this project and plan on posting a REVIEW soon.

8 comments so far

View Redoak49's profile


4430 posts in 2628 days

#1 posted 11-24-2018 11:50 AM

Useful and interesting….

View stefang's profile


17039 posts in 3973 days

#2 posted 11-24-2018 12:24 PM

Clever and uncomplicated jig. Nothing better! Thanks for sharing!

-- Mike, an American living in Norway.

View oldrivers's profile


1992 posts in 2206 days

#3 posted 11-24-2018 12:24 PM

Very nice, practical jig that will not only be a great time saver, but a joy to use.

-- Soli Deo gloria!

View DadofThree's profile


12 posts in 458 days

#4 posted 11-24-2018 02:47 PM

Really interesting. I haven’t seen a design like this for mortises yet. Great job!

-- Alfonso, Olympia, Washington

View waho6o9's profile


8815 posts in 3216 days

#5 posted 11-24-2018 02:58 PM

Brilliant ideas!

View Ivan's profile


15605 posts in 3507 days

#6 posted 11-24-2018 04:06 PM

Very interesting concept…another great idea about that kind of jigs.

-- Ivan, Croatia, Wooddicted

View Jim Jakosh's profile

Jim Jakosh

23854 posts in 3745 days

#7 posted 11-24-2018 10:18 PM

That is a great idea. It will be a favorite for a later date!

Thanks, Jim

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

View swirt's profile


4761 posts in 3611 days

#8 posted 11-25-2018 03:01 AM

Very clever design.

-- Galootish log blog,

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