We used 1/2" material for the "box " frame and 1/4" material for the dividers and back. The finished slots are 3 1/4" wide, 11" high and 15" deep. The ends of the top and bottom have 1/2" dado cuts for two reasons;
1) to keep the two outside slots 3 1/4" wide and
2) to simplify the cut list so the ends and dividers are the same size. Both the dado and groove cuts will be 1/4" deep or half the material thickness.

The top and bottom have 1/2" dado cuts at both ends, 8 divider grooves and 9 equal spaces of 3 1/4" for a total length of 32 1/4". The 2 ends and 8 dividers will be 11 1/2" x 15". The back will be 12" x 32 1/4".

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You can either cut the top and bottom to size first (15" x 32 1/4") or leave it as one larger piece (30 1/8" x 32 1/4") and cut it later on the table saw. We did the latter.

Using a table mounted router set the bit height to 1/4" and clamp a table fence into position so 1/2" of the bit is exposed. Run a dado on both ends of the board.

Next install a 1/4" spiral cutter in a table mounted router. Reverse the 1/4" spacer fence and bolt the top end in place using the existing hole in the fence and the Oak Park table top. Measure 3 1/4" from the fence to the bit and drill a new 1/4" hole through the fence and table top at the bottom. Bolt into position. Set the bit height to cut 1/4" deep groves. We used double stick tape to attach a piece of 1/2" thick scrap material to the table top on the opposite side of the bit for support to keep the material flat when cutting the 1/4" grooves.

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We are now ready to cut the grooves. Lay your board with the dado against the 1/4" spacer fence stick and cut the first groove. Next insert the groove over the 1/4" stick on the spacer fence and make another pass. You can continue this way to do all 8 grooves or do 4 from each end.

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To complete the project glue and nail the top and bottom to the ends. Nail the back to the "box" frame and slide the masonite dividers into place. You now have a well organized storage bin.

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