Splined Miter Jig (as promised)

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Project by gfadvm posted 12-24-2011 03:19 PM 6005 views 95 times favorited 24 comments Add to Favorites Watch

By the time I’m ready to cut splines, I have a lot of time and effort in a project and hate to ruin it at this late stage. This is my last (final) version. I just added the fence saddle after I let it wander off the fence thus wallowing out a spline cut. The big plusses of this jig are: it is very stable, the window allows you to see the blade when setting your cut up, and it allows you to clamp your box to the jig rather than trying to hold it in place. When cutting tear out prone wood I tape a 1/8” thick backer board behind the back edge of the box. I hope this helps others. As you can probably tell it is made completely of repurposed scraps. The blue tape tag says “fill miter slots to keep the sides of the jig from hanging up on a miter slot.This step is not always needed but when the sides are close to a slot I just lay a strip of scrap in the miter slots.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

24 comments so far

View  woodshaver Tony C   's profile

woodshaver Tony C

8633 posts in 4803 days

#1 posted 12-24-2011 03:49 PM

Great Idea! Thanks for sharing!

-- St Augustine FL, Experience is the sum of our mistakes!

View boxcarmarty's profile


17505 posts in 3810 days

#2 posted 12-24-2011 03:54 PM

SWEET!!! Love the no blade contact and the window at the side. It allows you to keep an eye on things. Heading out to the WoodShack now to give it a spin…..

-- My mind is like lighting, one brilliant flash, then its gone.....

View thelt's profile


671 posts in 4830 days

#3 posted 12-24-2011 04:12 PM

That’s probably the best design I’ve seen yet. Added to my Fav’s and gonna make one.

-- When asked what I did to make life worthwhile in my lifetime....I can respond with a great deal of pride and satisfaction, "I served a career in the United States Navy."

View JoeyG's profile


1275 posts in 4076 days

#4 posted 12-24-2011 04:43 PM

I have been trying to come up with a design that allows easy view of were the blade is. The toughest part these is getting the set up exactly right. I think I will take a look at mine and see if I can modify it to achieve what you have here. If not, it’s getting cold again and the old one will add a little warmth to the house and I will start over using your design. I always tape my corners, which helps with blow outs. Since I started doing this I haven’t had any major blow outs.

-- JoeyG ~~~

View woodsmithshop's profile


1425 posts in 4996 days

#5 posted 12-24-2011 05:26 PM

I like this design much better than what I am using now, I’ll have to try this. it looks like more support, and better visual of the project.

-- Smitty!!!

View foneman's profile


112 posts in 5545 days

#6 posted 12-24-2011 07:37 PM

I like everything about it!!!! Another project for my “todo” list!!! thanks for sharing!!!


View tenontim's profile


2131 posts in 5195 days

#7 posted 12-24-2011 08:31 PM

Nice jig. One suggestion, if the angled pieces were run all the way to the end of the slots (against the saw top), it would provide a back up and help prevent tear out. If you make different heights of slots, you could have extra pieces to install. Thanks for the post.

View Sodabowski's profile


2404 posts in 4283 days

#8 posted 12-24-2011 08:57 PM

That’s very clever. Another one added to the faves and to-do-list, thanks for sharing.
And hey, Merry Christmas! :)

-- Thomas - there are no problems, there are only solutions.

View Dusty56's profile


11868 posts in 5138 days

#9 posted 12-24-2011 09:18 PM

I was concerned about tear-out after seeing the pics before reading your post , but
if you only add the 1/8” ply to one side , doesn’t it throw off the spline on the other side ?

-- I'm absolutely positive that I couldn't be more uncertain!

View b2rtch's profile


4922 posts in 4499 days

#10 posted 12-24-2011 11:31 PM

I never needed on , most likely i shall never need one yet I like it very much

-- Bert

View rance's profile


4282 posts in 4611 days

#11 posted 12-25-2011 12:03 AM

I’ve always like the window type jigs so you can see your blade height. Nice job on this one. I also recommend using your backer board on ALL cuts, not just the ones you suspect will give you tearout.

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

View gfadvm's profile


14940 posts in 4140 days

#12 posted 12-25-2011 03:02 AM

Dusty, tape the backer board below the ‘window’ and its not a problem. Don’t remember who asked for this last night but I hope it helps. Rance, I usually tape the back side as I get very little tear out using the Freud box cutter set but your recommendation is right on. I just get lazy.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View Porchfish's profile


862 posts in 3983 days

#13 posted 12-25-2011 03:32 PM

Thanks for sharing ! Good ideas deserve to be used and spread around !

-- The pig caught under the fence is always the one doing all the squealing !

View Porchfish's profile


862 posts in 3983 days

#14 posted 12-25-2011 03:40 PM

Just thinking out loud….I like to cut splines on a 10 degree angle 1” from the top and turning the jig around cut a 10 degree spline in the opposite direction and put one centered between the two….I think that could be accomplished if I alter your design and widen the body to span the two miter slots and not use the fence…. I’m just thinking out loud….do you have any thoughts on the idea ? I used the two miter slots when I built by finger (box) joint jig and the stability is “gooder” than I had hoped for…. I’m thinking this would work …might need a clamp from the sides as well as front to back ? love bouncing ideas around ! Oh and if you added a 1/8” piece of scrap for tear out prevention in the back, you could add the same in the front to balance the size of spline cut ? ‘whatcha’ think ?

-- The pig caught under the fence is always the one doing all the squealing !

View ellen35's profile


2750 posts in 4883 days

#15 posted 12-25-2011 04:08 PM

Thinking out loud too… Wouldn’t it work better (a relative term!) if the back angled piece went all the way down and the front was open so you could see? I, like Len, worry about tear out and changing angles. Just a thought…I like the design, it is far superior to my flimsy one!

-- "Don't let the perfect be the enemy of the good." Voltaire

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