Step 1: Decide on the design, dimensions and materials you will be using for your cutting board. Assemble the required tools and materials.
Step 2: Assemble the butcher block. Alternate the wood grain by flipping the middle board over so that its grain runs counter to the outer two boards. Apply wood glue to the edges of the board where they will join. Clamp them together while the glue dries.
Step 3: Smooth the butcher block. Use a belt sander to flatten the cutting board surface so there is no noticeable ridge/transition from board to board. To do this, first move the sander across the boards in a diagonal motion. Once the transition is smooth, sand with the grain along the length of the boards.
Step 4: Notch the cutting board. Flip the board so the bottom side faces upward and draw a semicircle at the unfinished end with a compass and pencil.
Step 5: Add legs to the chopping block. Drill four legs sockets into the bottom of the cutting board, using a drill press. DO NOT drill through the board. Place a socket at each corner on the flat end of the board, about 1/2 inch off the long and the short sides. Align the two sockets about 1/2 inch from the long side of the board, but inset them about two inches from the short side to provide clearance for the semicircle and recess.
Step 6: Finish the surface. Add a mineral oil coating to protect the board from food and liquids. Sand the mineral oil into the board using No. 400 wet and dry sandpaper.