MortiseMeister - the ultimate simple adjustable mortise jig for routers

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Project by Scott posted 616 days ago 7949 views 62 times favorited 34 comments Add to Favorites Watch

This jig works in conjunction with your router and its edge guide. It has a fixed stop on one end and an adjustable stop on the other end to limit the length of the mortise. The guide helps to support the router and keep it square. The tabs on top of both long pieces of the jig make it very easy to align it flush with the workpiece. You can use this on any length workpiece, short or long.

If the mortise is closer to one end of the workpiece, and you need to make several pieces identically, then you can add another adjustable stop, so you can easily get repeatable results. See photo 3.

If the mortise is wider than your largest bit, then just move the router to the other side of the jig with the stops in place and cut the other side of the mortise slot.

The mortise jig is made from 1×3 dimensional lumber, so really 3/4×2.5. It is the premium pine from Lowe’s hardware, and it is very straight. I glued two together for each rail. The length is 24 inches.

-- Scott in North Carolina

34 comments so far

View majuvla's profile


3324 posts in 1499 days

#1 posted 616 days ago

It’s always good to see fresh ideas for jigs!

-- Ivan, Croatia, Wooddicted

View a1Jim's profile


112014 posts in 2208 days

#2 posted 616 days ago

Very creative a way cool design simple but very effective.

-- Custom furniture

View Sarit's profile


480 posts in 1771 days

#3 posted 616 days ago

That’s really cool. I keep meaning to build a mortising jig. This has given me some ideas already.

View Scott 's profile


154 posts in 898 days

#4 posted 616 days ago

Thanks for the comments! Thanks Jim, I appreciate all your comments!

-- Scott in North Carolina

View ptofimpact's profile


254 posts in 948 days

#5 posted 615 days ago

Scott, another great jig, I marvel at how creative you are, and how simple you keep it, thanks for sharing

-- Pete in NC

View Scott 's profile


154 posts in 898 days

#6 posted 615 days ago

Thanks Pete, I think my brain works that way. I like puzzling over an idea and stripping it down into the simplest elements.

-- Scott in North Carolina

View Sergio's profile


402 posts in 1324 days

#7 posted 615 days ago

That can be useful. Thanks for sharing your idea!

-- - Greetings from Brazil - --

View MJCD's profile


452 posts in 1002 days

#8 posted 615 days ago


1st – nice work – I’m going to try to replicate this, if you don’t mind.

2nd – while I am very interested in you jig, there was an advertisement for T-Shirts – to the right hand side of your post – which was particularly captivating. Perhaps we should ask Lumberjocks to post our work with dull and boring advertisements … less competition for our diminished attention span.


-- Lead By Example; Make a Difference

View kdc68's profile


1964 posts in 908 days

#9 posted 615 days ago

Nice jig….looks like an easy way to make mortises

-- Measure "at least" twice and cut once

View Scott 's profile


154 posts in 898 days

#10 posted 615 days ago

MJCD – Yes, help yourself, I hope you like it.

I too have seen that ad, so I know exactly what you mean. It didn’t stay for long, so they must figure the Home Depot ad sitting there now is just as appropriate on this website!

-- Scott in North Carolina

View sawdustmaster's profile


70 posts in 1457 days

#11 posted 615 days ago

Can you get me one by Christmas?

-- --Now we are surrounded sir. "Excellent private, now we can attack in any direction."

View Scott 's profile


154 posts in 898 days

#12 posted 615 days ago

sawdustmaster – Wish I had that kind of time. Man if only my project list would shrink, but I add to it faster than I crank them out !!!

-- Scott in North Carolina

View Milo's profile


851 posts in 1950 days

#13 posted 615 days ago

What is picture three of? And what does the dado do in the right side of the jig in picture four?



-- Beer, Beer, Thank God for Beer. It's my way of keeping my mind fresh and clear...

View Scott 's profile


154 posts in 898 days

#14 posted 615 days ago

Milo, in picture three it shows the stop that you can optionally insert. If you have a very long board with the mortise in the middle of it then you would just remove the stop, as shown in photo 1. If you have a mortise near the end of the board then photo three shows that you can just press the board up to the stop. Cut the mortise, then if you have more boards with a mortise in the same place, just insert the new board and press it against the stop, and you are ready to cut another mortise without doing any measuring.

In photo 4, on the right side of that photo, that is the stop that is shown in photo 3. I just slides in a groove and tightens with a knob on the outside, and the stop rides on the inside.

I hope that explains it, let me know if not.

-- Scott in North Carolina

View mafe's profile


9491 posts in 1720 days

#15 posted 615 days ago

One more clever and simple jig.
Love it!
Best thoughts,

-- Mad F, the fanatical rhykenologist and vintage architect. Democraticwoodworking.

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