Flattening jig for router my favorite project

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Project by Agentwusabi posted 02-24-2017 04:02 AM 2531 views 23 times favorited 13 comments Add to Favorites Watch

Planing and jointing lumber is crucial to a tight fitting and square project but… a jointer over 6 1/2” gets pricey and a planer can make your material flat but takes special sleds to get the job done. So, I had this out feed table and starting figuring the dimensions I would need to use some 1” conduit and roller skate bearings to make a easy to move flattening jig to plane my lumber up to 3’ wide by 5’ long. This has been the absolute most versatile and useful jig I’ve made so far. I milled the boards for bench I made for my mother because they were cupped and warped so if I ran them through my planer they would have just contoured to that shape so I just shim the up and use my clamps to hold the boards in place then mill them flat. I am working on a dining table and milled some 6”x8” oak boards to 5”x7” with this jig in no time at all and they end up extremely flat and square. I am also in the process of redesigning my linear rails and bearings along with and entirely new x axis bridge which once I’m done I’ll post a new project of it.

13 comments so far

View majuvla's profile


13399 posts in 3073 days

#1 posted 02-24-2017 06:47 AM

There are cases when man realy need this jig (including myself – but my worshop garage is realy to small for it) – nice work.

-- Ivan, Croatia, Wooddicted

View Scott Oldre's profile

Scott Oldre

1104 posts in 3637 days

#2 posted 02-24-2017 01:58 PM

I like this idea. I’ve done a planning of a slab before using the technique, but I like your thought process with the bearings and movement. Nicely done. really like the clamping porcess.

-- Scott, Irmo SC

View JimInNM's profile


310 posts in 1422 days

#3 posted 02-24-2017 02:28 PM

Waiting for your improved plan although I don’t see a need for anything better than what you’ve shown here. Hope you give a detailed description of the blocks that hold the wheel bearings as they appear complicated but critical to the project…Jim

-- JimInNM........Space Case

View builtinbkyn's profile


2654 posts in 1146 days

#4 posted 02-24-2017 03:44 PM

That’s a really nice design. Looking forward to seeing the redesign :)

-- Bill, Yo! Brooklyn & Steel City :)

View waho6o9's profile


8525 posts in 2783 days

#5 posted 02-24-2017 04:52 PM


View MorganTS's profile


3 posts in 1428 days

#6 posted 02-24-2017 05:55 PM

What router bit do you use for big pieces?

View cicerojoe's profile


64 posts in 3651 days

#7 posted 02-24-2017 07:24 PM

That kind of looks like a integrated down draft table. Is It?

-- John from the Cherry Valley Studio in NY

View SteveMI's profile


1124 posts in 3500 days

#8 posted 02-24-2017 07:30 PM

I do it a little differently, but same concept. Only a 6” jointer and 14” planer in the shop. Since I make smaller things I only needed the length to be 4’. The twisted, warped and curled boards aren’t that easy even on a wider jointer.

I just route a 1” slot on each side of the board on the edge until it is flat for the wood length and then put “flat” wood strips in the slots. Then I plane the untouched side until flat using the strips to give the planer a flat reference. Next is to flip it, remove the strips and plane that side. I use hot glue on the strip sides.

There was an article in FWW several years ago about just using shims to get the top of the rough board as flat as possible to an underneath flat sled and then run it through the planer.


View helluvawreck's profile


32087 posts in 3073 days

#9 posted 02-24-2017 10:54 PM

It looks like a good practical jig. It’s a great addition to your shop.

helluvawreck aka Charles

-- helluvawreck aka Charles,

View Agentwusabi's profile


19 posts in 671 days

#10 posted 02-24-2017 11:49 PM

I use a 1 1/2” freud router bit and man does it make short work of it. 1-1/2” (Dia.) Double Flute Straight Bit (Double Grind) The table top was originally made to be an out feed table for the table saw and an assembly table.

View kocgolf's profile


367 posts in 2384 days

#11 posted 02-25-2017 02:01 AM

I used to have a similar setup for slabs but it was a casualty of a house move. I have never seen it done quite like that with the pipes and roller wheels. I like it! I think when it comes time to build a new one, I might just steal this design. Very cool. Thanks for sharing!

View Agentwusabi's profile


19 posts in 671 days

#12 posted 02-25-2017 03:52 AM

Here’s the first design change, I made new linear bearings with 5/16” rods connecting the 2 halves so that I can loosen or tighten them to fit the rails better. The second change is the linear rails, I made the supports 2 1/2” tall which adds a lot more stiffness to them. I had to use a piece of wood with a hex cut out on the end to hold the nut so I cold get the bolts tightened from the supports to the rails.

View canadianchips's profile


2613 posts in 3203 days

#13 posted 02-26-2017 04:53 AM

I want to make one SOMEDAY ! I think a person would get a LOT of use from it.
Looks like a Ron Paulk table design underneath, another useful idea !

-- "My mission in life - make everyone smile !"

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