MortiseMeister - the ultimate simple adjustable mortise jig for routers

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Project by flowerdog posted 12-19-2012 05:51 PM 25978 views 78 times favorited 38 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.

38 comments so far

View Ivan's profile


17010 posts in 4111 days

#1 posted 12-19-2012 06:11 PM

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

-- Ivan, Croatia, Wooddicted

View a1Jim's profile


118258 posts in 4821 days

#2 posted 12-19-2012 07:00 PM

Very creative a way cool design simple but very effective.


View Sarit's profile


552 posts in 4383 days

#3 posted 12-19-2012 07:02 PM

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

View flowerdog's profile


294 posts in 3511 days

#4 posted 12-19-2012 07:03 PM

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

View ptofimpact's profile


393 posts in 3560 days

#5 posted 12-19-2012 07:19 PM

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

-- Pete in NC

View flowerdog's profile


294 posts in 3511 days

#6 posted 12-19-2012 07:24 PM

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

View Sergio's profile


470 posts in 3936 days

#7 posted 12-19-2012 08:03 PM

That can be useful. Thanks for sharing your idea!

-- - Greetings from Brazil - --

View MJCD's profile


617 posts in 3615 days

#8 posted 12-19-2012 08:56 PM


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.


View kdc68's profile


3016 posts in 3520 days

#9 posted 12-19-2012 09:03 PM

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

-- Measure "at least" twice and cut once

View flowerdog's profile


294 posts in 3511 days

#10 posted 12-19-2012 09:06 PM

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!

View sawdustmaster's profile


70 posts in 4070 days

#11 posted 12-19-2012 09:07 PM

Can you get me one by Christmas?

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

View flowerdog's profile


294 posts in 3511 days

#12 posted 12-19-2012 09:11 PM

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 !!!

View Milo's profile


869 posts in 4563 days

#13 posted 12-19-2012 10:58 PM

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 flowerdog's profile


294 posts in 3511 days

#14 posted 12-19-2012 11:30 PM

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.

View mafe's profile


13344 posts in 4333 days

#15 posted 12-20-2012 12:10 AM

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

-- MAD F, the fanatical rhykenologist and vintage architect.

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