Putting the "log" back in Blog

Split-top Roubo: Fixing a Mistake or Stretching your Resources?


Posted on March 5th, by Andy Brownell in Gorilla Glue, Projects. No Comments

My pile of maple was less than perfect when I finished milling it. I’m lucky some of the pieces ended up flat in the first place. One of the laminate pieces for my legs had a long check on one end, and was a little thin on the other. So rather than scrapping it completely, I went ahead and cut the mortise and then needed to figure out how to get things back to square. I could have tried to mess with the shoulder of the rail/tenon, but that would require transferring angles along multiple dimensions that would match the mortise cheeks.

Instead I transfered the mortise opening on a small shim of maple, glued it up and brought everything back into square. Considering this is along the back-side of a leg on a workbench n0body will ever see, I’m happy with the results.

Here is the step-by-step process:

The location of the mortise on the leg is ~ 1/16" out of square.

Extending mortise locations with lines to ends of piece before laying over the shim.

Transfer mortise location using guide lines to shim and remove waste.

Apply Gorilla wood glue and clamp the shim in place. I use blue painters tape to make clean-up easy.

Plane flat with a joiner plane using the true surface to bring the mortise opening back to flat.

It's not pretty, but it's filled in the location where the wood was missing along the mortise location.

The tapered shim brings everything back into square.

The results: A tight fit and good enough for a workbench.





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