giant Cypress: Japanese woodworking tool punk • Building a Roubo workbench rerun

Building a Roubo workbench rerun - 4

(Originally written Jan 21, 2009)

Last night I got a leg up on flattening the bottom of my benchtop. When I was gluing up the beams, I tried to align the tops of the beams as best as I could. The top side looks pretty good, but what this means is that all the misalignments show up on the bottom side of the bench. Since I’m using a Roubo design, the legs are going to be mortised directly into the bottom, so if the bottom surface isn’t flat, the shoulders of the leg tenons won’t be in the same plane, and the legs and lower stretchers won’t be square.

I forgot to take a better “before” picture, but you can get an idea of how much unevenness there is between the bottom surfaces of the beams here. In many places, there were 1/8” discrepancies between the beams.

I put an even more aggressive camber on my jack plane than I had been using — about equivalent to a 10” radius. This allowed me to take off really thick shavings, close to 1/64”. This meant that theoretically, 8 swipes of the plane would level a 1/8” discrepancy. Being able to take down this much wood at a time, the majority of the unevenness was gone after only 30 minutes.

Look at the mess I made! Not bad for just 30 minutes of planing, I think. I was pretty surprised as to how quickly this went. You can get an idea of how thick the shavings from the jack plane were at the front by the jointer plane. The jointer plane is just there to give a sense of scale for the size of the benchtop. I didn’t use it last night, but I’m sure it will be put to use pretty soon.

At this point I realized that I hadn’t made winding sticks yet to check for twist, so I called it a night.