![]() ![]() The next slide shows the completed frame without the axle. These pieces will be heavily stressed, so make sure they are solidly attached to the frame before continuing. Drill a pilot hole (oak might split without the pilot hole), and then, using the round-head wood screws, attach the oak strips to the base and end pieces as shown. With a saw, cut notches in the top of the oak strips for string attachment. Attach the other side to the base with the 1-5/8-inch deck screws.ĩ. Place one side of the axle in the hole in the attached side, and then bring up the other side, positioning it so that the other side of the axle rests in the corresponding hole. Glue a rectangular eraser, a sponge, or other resilient surface to one of the end pieces, to cushion the impact of the throwing arm when it impacts the frame after the hurl.Ĩ. Using the 2-1/2-inch deck screws, attach the 9-1/2-inch 2 x 4 end pieces to the base. Attach one of the trapezoidal sidepieces to the 9-1/2 x 15–inch base using the 1-5/8-inch deck screws.ħ. These holes act as bearings for the axle. Do not drill all the way through the wood. Then drill a 3/4-inch hole 3/8-inch deep in the middle of both sidepieces, 1-1/2 inches from the top. A sturdy frame is important, so take your time and fasten all pieces together carefully.īegin by cutting 15-inch 1 x 6 pine boards into the trapezoid sidepieces as shown. Aviation snips or rotary tool with cutoff wheelĦ.Drill with 1/8-inch and 1/4-inch drill bits and a 3/4-inch wood drill bit.Small chisel or rotary tool with small straight router bit.Small projectile such as a small rubber ball.Trigger: One 5/16-inch-diameter, 5-inch-long (nominal) hardwood dowel.Tension Springs: Four 1-1/4-inch x 1/4-inch x 20-inch oak strips (available in trim section of a lumber yard or home store). ![]()
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