31 Jan. 1999|
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You have a little piece of round dowel and you drill a hole in your piece of wood that is the same size. Designed for hurling tennis balls, this 30 inch (axle height) Trebuchet is a working model suitable for learning the fundamentals of Hinged Counter Weight Trebuchet.
This is a set of plans and instructions for building a small-scale hinged counter weight (HCW) Trebuchet suitable for hurling tennis balls with.
All three of these pieces should be hard wood of some sort, check the plans for the tapered shape, ask the lumber yard what they have in stock and then see if they'll cut the taper for you. You can, if you wish, use different methods of fastening things together, like nuts and bolts, screws, wooden pins, rubber bands, wishful thinking, bubble gum, spit, etc. The Release Pin is placed on top in my design, but one school of thought puts it on the bottom. You can make a pouch suitable for tennis balls and other similarly sized objects out of almost anything. The author of these plans and instructions assumes no responsibility for any injury or damage. An office size stapler will work, but if you have access to a larger version use short staples in it to keep from splitting the wood.
If you have the resources to do so, you could put threads on the ends of each of these and then put nuts on to hold things in place. If you plan on throwing sharp rocks you may want to choose a material that will withstand those sharp corners.
You simply put a wooden pin in a selected hole to hold the rubber band at a different location. It is just a way to strongly secure two pieces of wood together and you can do it without glue or with glue.
You can buy this wood very easily at home improvement stores, harware stores and most hobby stores. These consist mostly of angled cuts in the wood of the frame for the over lapping joints and two holes that have to be drilled at an angle for the axle. I would advise that you have a good plan for trapping the axle in some manner rather than letting it just sit on top. A wood glue is used and although this means taking a longer time to assemble the machine there is less risk of splitting these relatively narrow pieces of wood and the glue, if applied properly, will make a stronger joint.
I would discourage you from trying this test but I have balanced my entire weight on the top of the frame, without the throwing arm, all 150 pounds of me.
Depending on the quality and type of wood your using it may not be needed, you'll have to judge that for yourself.
For a tennis ball, make the diamond shape anywhere from 8 to 10 inches long and 5 or 6 inches wide. I should point out that the frame was designed to support the loads and forces of a Trebuchet and yet be quick and easy to build. The Eye Screw is placed on the bottom and as close to the tip as you can get without interfering with the twine wrap.
These pieces of wood are going to be so small in cross section that even one knot could be disastrous, so inspect it carefully.
If needed you might try adjusting the length of one of the Outriggers to help get things place correctly.