Low Budget Knifemaker's Bench Grinder Instructables
Process; Start by gluing two 1"x5", two 1"x4" and two 1"x4" pieces together, and clamp tightly. Once the glue has dried, cut the corners off using a chop saw, then find the center of each piece. Set them in your lathe, reducing their diameter until you're left with a 2"x4" wheel, and two 2"x3" wheels.