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Showing results for tags 'improved accuracy'.
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I built a William Ng Box Joint Jig a few years ago. I was not thrilled with the way you had to adjust the pin, just not accurate enough for me and took way too much time even though William made it look easy. The first thing I did was make a better way to hold the back board to the sled. I drilled a couple of 1" holes and in the corresponding place on the back board I counter bored for 1/4"-20 carriage bolts. I turned some knobs and counter bored for the nut. Now I didn't need to have a clamp in my way when making the box joints and I could adjust the back board very easy. Next I wanted a way to move the back board by a couple of thousands precisely. I took a couple of pieces of 6061 aluminum and countersunk for some deck screws and tapped for a 1/4"-20 set screw. I made sure the screw heads were not past the back board. I used a wing nut and a regular nut to lock the wing nut on the half dog point (flat tip) setscrew. Now I can crack loose the lock knobs and back off one screw a tad and tighten the opposite one and move the back board a couple of thousands. Sure made it easy to dial the pin width to match the dado stack minus glue clearance. I use aluminum but hard wood would work fine but when your a machinist and have a machine shop you can't help using metal. Yes the box joint jig is sitting on my William Ng sled which I use more than I assumed I would. A test box joint. The back board is for 3/8" dado stack and all you would need is another back board for other sizes. The first cuts are on the front and back starting at the bottom. The arrow points to the bottom of the drawer side. The first cut on the sides you reverse the front or back and place it over the pin then make the first cut on the side. Arrows point to the bottom of the drawer side on the left and front on the right. This gives you a perfect fit on the side. By cutting this way you don't have an holes in the side of the drawer from the bottom dado cuts. I just happen to have an unfinished drawer to show how that works. It almost seems like this should go in a general woodworking jigs and fixtures sub section... JT
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