The Leg vice starts out 1 1/2×8 x34” Near table top height.
The top tapers to the bottom in mine and the others I saw so that the bottom flexes first when its used.
Mine Is 1/4 inside the leg width and 8”inches at the top.. You want the top face to drop its dimension down to the screw and then taper so that it looks like a coffin kinda… Here is a picture of it done and laying on the leg its to be mounted on..
I Already chopped and fitted the bottom of the Leg vice and glued it up, by the time I took this.. Its Ash also and its 2×1” and I chopped out the mortise for it and pined it with walnut. The next picture I carefully layed the Leg with is um.. woodie.. down next to the leg and made the top just a bit proud (its end grain lets not kill ourselves..) then I traced the bottom of the brace’s top and bottom along the leg. Then I used my square to transfer them up to the top/outside face. Used the woodie itself to trace it’s width.Then I drilled it out…. but! First I clamped a anti chip out to it… (the lower is gonna be close to the 2nd hole so I took off its laddie’s slipper..
Drilling it …
Ok So that fits, I droped it into the hole and then carefully aligned the Top a bit proud again and then clamped it down tight. I measured the center down and struck a line and then at the screw Height I wanted (about 9”) struck another across it. I then drilled the clamped piece thru into the leg to start it..
Removed the Leg Vice and then drilled down as far as I could into the Leg its self… Then I took a long 1/8 Bit and drilled down thru the upper hole (Norm would be proud of me.. ) I put on my googoo goggles and drilled up from the bottom going slowly.. till the hole was done. (I sized it an 1/16th over just to be safe.. .Its a fricking workbench!) anyway after the exertion.. I dropped the screw in and checked it out.
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