Bookshelf ladder – Starting with cut to 1 x 6 inch oak plank in 72 inch lengths on the table saw. Draw a line at 80 degrees to the side of each plank, and at the foot of each plank. On 15-inch intervals, draw four lines parallel to and above the new bottom of each plank. Two, mark the center point of each of these lines with a pencil and mark a point two inches on each side of these brands. Using a 1/4 inch bit, drill holes on each of these selected points.
You should end up with 12 holes on each plank. Countersink each of these holes in the side of the wood should be on the outside of the finished bookshelf ladder product. Three, cape 1 x 12 inch oak four 36-inch lengths of the table saw. Using a rip guide, cutting down the length of three of these pieces so that they are 11, 10 and 9 inches wide, respectively. The 9-inch piece is top shelf and 12-inch piece bottom shelf. Four, measure and mark the center point at each end of these four pieces of wood.
Mark a point 2 inches on each side of these points. Marks must be exactly halfway between the top and bottom of each piece. Drill 1/8-inch pilot holes at each of these points. And about 1/2 to 3/4 inch deep. Last, add some wood glue on the end of the shelves where the pilot holes. Do not place it more than an inch outside the pilot holes as this will overlap width of the side pieces. Unscrew the shelves in place. Cover the screw heads with a little oak tatters, and when it has dried out, sand it smooth. And your bookshelf ladder was done.