Getting a flat jig or lamination without a flat reference surface

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Forum topic by Sirgreggins posted 09-11-2013 02:03 PM 1188 views 0 times favorited 3 replies Add to Favorites Watch
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299 posts in 2260 days

09-11-2013 02:03 PM

I’m looking to make a planer sled this weekend and am going to follow Fine Woodworkings’ article on it. My workbench is sorta flat and i’m sure flat enough to make this torsion box style jig, but what about when i have to do laminations. Should i use shims and clamps to hold a piece flat? Any tricks to tweaking something into flat if the surface youre working on isnt ideal? I also need to make crosscut sled and the back fence will be 2 pieces of ply laminated together. when i put the pieces on my bench theres a low spot in the middle. Of course if i were to glue these together the glue would dry and the pieces would be permanently out of flat.

3 replies so far

View Loren's profile


10476 posts in 3672 days

#1 posted 09-11-2013 04:22 PM

I think you should go about making your bench flat.

Your table saw top is probably flat enough for most
woodworking assembly work.

View ADHDan's profile


800 posts in 2133 days

#2 posted 09-11-2013 05:50 PM

If you don’t want to work your bench flat, maybe do what you were planning to do except use it to make your new table surface – get a (thick) piece of material you were going to use for a sled, shim it everwhere possible to make it supported flat on your table, then screw it down? Voila – your workbench is flat!

(For real a flat workbench is a good idea for many reasons. I use thick conference room tabletops my office was tossing, maybe you could find something like this or a solid core door on Craigslist?)

-- Dan in Minneapolis, woodworking since 11/11.

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299 posts in 2260 days

#3 posted 09-11-2013 08:04 PM

i made my workbench out of a sheet of ply wood cut into 4×3/4”x 24” x 48” pieces and 1 3/4 MDF sheet all laminated together. and covered with hardboard. I did the lamination on my garage floor. The floor is obviously WAY out of flat. I’ll try the shim idea

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