The thickness plainer jig.

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Project by RiaanK posted 142 days ago 2977 views 63 times favorited 22 comments Add to Favorites Watch


The one tool that I have been wanting badly, for a very long time, is way above my budget, and that’s the thickness plainer.

So after looking at some jigs from all over, I came up with my own version.
The same principal as all the jigs available, but with a thickness adjuster.

What I have done.
Where the stock will be, I made an adjustable platform, with bolts on all corners on the bottom of it.
And with rulers on all sides of the housing. The rulers stars 5MM from the top where the slider holding the router slides on.(I just need to replace this with stainless steel rulers, this is all I could find at the time)
I placed the platform on zero, placed the router in, and pushed it down so that the bit is also on zero then, and locked the router.
Removing the router, I placed it on top of the sliders sides, and routed a piece out. So now, when I need to plane, I place the router on top of the slider, push it down, and lock it, then the bit will be sticking out 5MM on the bottom of the slider. So, zero with the rulers.

Now I can adjust the platform to a required thickness, and plane away. I also added the two pieces on the platform, that fastens at the ends of the platform, this allows me to “clamp” the stock down, as in picture 3.

Hope you like it, because this work like a dream for me (until I have the cash for the machine)

Thanks for looking.

-- Riaan

22 comments so far

View Hawaiilad's profile


1907 posts in 1645 days

#1 posted 141 days ago

You know, I do own a thickness planer, a jointer as well as allot of other shop tools, but I’ll bet your set up works just a good if not better…because you built it. I love hearing how other woodworkers make the jigs they use…something I have never been good at.

-- Larry in sunny and warm Hawaii,

View robscastle's profile


1620 posts in 828 days

#2 posted 141 days ago

Nice work there. possibly more correctly named as a “slabber” but it is a thicknesser just the same.
I t will do exactly the same job!

I built one some years ago but not as friendly as yours, keep up the good work!!!

-- Regards Robert

View Bill_N's profile


234 posts in 902 days

#3 posted 141 days ago

I think this will be great for flattening boards also.
Looks well built and useful

-- I have the Saw Dust Fever

View michelletwo's profile


2221 posts in 1639 days

#4 posted 141 days ago

like the rulers

-- We call the destruction of replaceable human made items vandalism, while the destruction of irreplaceable natural resources is called development.

View KnotCurser's profile


1812 posts in 1692 days

#5 posted 141 days ago

Very nice build and well thought out.

If/when you build an endgrain cutting board you will find out that this will do much better than a thickness planer!

Thanks for sharing this!



-- Robert Rhoades WoodWorks / Email: /

View oldrivers's profile


241 posts in 190 days

#6 posted 141 days ago

Very Good and Practical tool, I have a 20” thickness Planer but I can see a use for this to flattened boards that are cupped and too wide for my jointer prior to using the Thickness planner.

-- Soli Deo gloria!

View Oldtool's profile


1772 posts in 814 days

#7 posted 141 days ago

Great build, well designed and constructed. A thickness planer and face jointer, great tool for woodworking. Have fun with it, happy woodworking.

-- "I am a firm believer in the people. If given the truth, they can be depended upon to meet any national crisis. The point is to bring them the real facts." - Abraham Lincoln

View dvail12's profile


17 posts in 595 days

#8 posted 141 days ago

This will do something a thickness planer will not. And a lot cheaper than a jointer wide enough to handle a wide board. As long as the platform is true and the board supported where it does not meet the base, flattening a twisted slab would be a snap. I like it. Do not lament, this is a fine piece of workmanship. And let necessity continue to mother invention. Terrific!

-- Dvail12

View DMC1903's profile


186 posts in 951 days

#9 posted 141 days ago

Nice work!!

View helluvawreck's profile


15582 posts in 1490 days

#10 posted 141 days ago

It should be a great addition to your shop. Well done!

helluvawreck aka Charles

-- If a man does not keep pace with his companions, perhaps it is because he hears a different drummer. Let him step to the music which he hears, however measured or far away. Henry David Thoreau

View PaulDoug's profile


528 posts in 327 days

#11 posted 141 days ago

Well done. I can immediately see an advantage to it and that is the ability to thickness plane short pieces. I guess you can do it on a planner but it would require some type of sled. How smooth of a finish can you get?

-- “We all die. The goal isn't to live forever; the goal is to create something that will.” - Chuck Palahniuk

View bit101's profile


91 posts in 500 days

#12 posted 141 days ago

I’ve been planning on building one of these for a while now myself. Probably not as elaborate as yours though, at least to start. Great work.

View tyvekboy's profile


532 posts in 1637 days

#13 posted 141 days ago

You done good!

I have a DeWalt 13 inch thickness planer but there are times when it won’t handle some of the stuff that I have to flatten. You design is really good and I may use that idea in the future to make me one. Right now I just use 2 L-shaped guides that are about 8 feet long that I clamp to a flat board.

My Router carriage is about 3 feet wide and rides the guides. I actually made it to flatten my glued up bench tops when I was building my workbench. So the capacity of my setup is about 8 feet long by 3 feet wide.

I don’t need it very much so it is not a permanent as your setup is. Again, good work. Thanks for sharing the idea.

-- Tyvekboy -- Marietta, GA

View Allen4's profile


9 posts in 146 days

#14 posted 141 days ago

Nice. Just got my first planer. Bought it used off craigslist. It works great for cutting thickness and smoothing a board, but I am stuck if the boards not flat to begin with. I think this will be a great value to you now and in the future. Planers you will come by fairly inexpensively for 12-13”. A jointer of that capacity will break the bank. Looks like another project on my list.

View MarkTheFiddler's profile


1766 posts in 812 days

#15 posted 141 days ago


Thanks very much for the NEXT innovation in thickness planers. Well done. I really like your solution.
A few questions for you.

What bit are you using?
What’s the HP on the router?
How much material (depth) do you remove in a pass?
Any tear out issues?

I may go ahead and build one of these. I’ll be using your solution for thickness. I’m like you. I’m still watching where the next $ goes. My woodshop is years from being fully equipped.

-- Thanks for all the lessons!

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