You're going to have to do some testing and fiddling to find out what works best. I'm pretty sure I made my dowels 1/2" wide and 8 inches long. the floating arm trebuchet where did it originate? *look at the last step: improvements. LEAVE A COMMENT AND RATE! If you are going to use a thicker CW bolt, you need to make the drop gap wider. Ok lets get started. Ensure that the tension will be applied in a direction that is similar to the way it is intended to be used in a car door. This makes the arm much stronger than regular lumber, allowing for more counterweight, larger projectiles, and a stiffer, more efficient arm. I don't know how long to make the rope or how to attach the sling or how it is even supposed to work? The thicker the better to prevent it from bending. I recommend using a pin, then a thick nail, then a screw and finally a pencil to widen the hole for the string. It is scaled using the data of skullmech;s trebuchet, but taller as we had no hieght restriction. The lines shown in the 9th picture show 2.5 feet. Arm-sling constraint, arm on fixed roller, projectile on ramp. 11 years ago It's been 4 years since I built this in 8th grade (graduated high school by now), but its still lots of fun to set up and launch! The third clip in the video shows this problem well- the arm kind of rolled over and on top of the guide blocks because they were too high. Ask me if you have a question. So we built a 10 throwing arm trebuchet. they would be horizontal, not angled. The person holding the arm up can relax. I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. It's 12 feet tall with a 10 foot arm. We are to have a constructed trebuchet and have it prepared to launch on Tuesday, April 23. I really appreciate your work in building this instructable. Make sure the washers do not interfere with the drop channel. If you have a router, it would be easier to do this by just cutting away the material. If the weight is very heavy, the long part of the arm can The wheels were fixed in a similar fashion, and axle grease was used to lubricate the wheels. Awesome! The first picture shows what this looks like. If you do end up building a floating arm trebuchet, please let me know. None seem to affect it structurally, but we'll see. Again, not critical. i will keep that in mind. Really cool project Brother, thanks for putting together a great instructable. This ring will be what loops around the pin. The Arm. thick plywood, 2 ft., 5 in. with that. 2 segments of 6 ft., 2 in. 2 segments of 6 ft. (1.8288 m) long 1 X 6 4. These make up the short arm So, use the turnbuckle system I mentioned in the introduction. then divide your total beam length by that number. Make the long arm lighter. 7. simplest step. grab the last 3 ft, 6 in 2 X 4s. Line the short edge up with the 8 ft piece of the drop channel. They have the same orientation a Our team devised a problem statement: Design and construct a launching device to maximize the horizontal Platform is pine. If you need any more help feel free to let me know, and it would be great to see a picture of the final thing. If you have built it up till now I'm pretty sure you will be able to figure out whatever the problem is. Ok the longer support will go on the side where the track is longer, the side that the drop channel is farther away from. 14. Again, the lateral placement in this corner does not matter as long as both edges of the diagonal meet evenly along the track and support. more on that later. The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. ratio of counter weight to projectile about 90 to 1 weight. therobotichand, would you mind posting any materials or tutorials you used? This may need to be changed WebThe Cardan Gear Linear Motion Trebuchet is an adaptation of the motion found in a Cardan Gear adapted to a straight track-drop trebuchet. These are really simple. Take off the drop channels completely so you can cut through here. 1 keychain ring Ok, now to attach the drop channels. 2 segments of 6 ft., 2 in. This is a more efficient way to transfer potential energy into kinetic energy at a small scale. Get everyone away from the back and front of the trebuchet. 3 ft. (0.9144 m.) long 5/8 in. Licensed under CC BY 3.0, via Wikimedia 18. trebuchet main track supports and track.tiff, Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. Quickly, before the other guy gets sore holding the arm, the person on the trebuchet will need to slide some scrap 2 X 4s around a foot long over the gap in the track. I've definitely seen some trebuchets in that size range throwing tennis balls, 6" steel shot, etc very far. i need to make mine 3x3x3. So for a 3.5:1 ratio and 7 ft beam, my short arm would be 1.55 feet and my long arm would be 5.6 feet, more or less. The pinis crap. Does anyone have a solid works file for this trebuchet? This might change depending on your weights setup. A few things to keep in mind are the optimum ratio for the arm length (2:1) , or L=3P in the schematic diagram. The eyes face inward. Tools I'd guess that for throwing oranges, you'd want to be around 5-6 ft high and an 8ft arm, and maybe 50-100 lbs of weight? You can use a clamp and a tape measure in combination to figure out the right lengths before you cut them. MAKE SURE THE EYE OF THE TRIGGER PIN IS FACING THE FRONT OF THE TREBUCHET otherwise you will have to switch it. No specimens or models from medieval times survive. Approx. A wide chisel would also work. 2. This metal loop goes around the pin, and as the centrifugal force increases as the arm swings, the ring slides off the pin to allow the pouch to open. Make sure the gap is aligned with the supports and the gap in the drop channels. Buy 15 2 X 4s to start off with, then buy more later. The chain link on the opposite end should click into the door release easily. 1 segment of 7 ft. long 2 X 4 I would still recommend that you read through the list, and buy the lumber as you need it to avoid wasting wood. Thanks for your appreciation :D I would love to check out the Medieval Stuff Chucker, but the link to the youtube video doesn't work. If you can't get it to the top in one shot, use the supports. Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. diagonal supports, lateral and track-supporting Use a washer wherever metal is coming in contact with wood. They would extend outward, just like the board chute. Stick a few inches of tape over that area, making sure you get it on the inside and outside of the seam. y Test 3: When the trigger is released and with the arm slightly Other than those, there haven't really been any problems with the frame. this number is your short arm length in feet(If you kept everything in feet) So, you need to drill the holes four inches deep into both the arm and the extension. I'm going to assume that you are drilling one long hole through all of the short arm pieces. 7. Ensure that the shafts you choose have a diameter that mates well with your inside wheel diameter, as well as your inserts. First, I'm going to talk about some other improvements that are more important than the arm. Everything moving should always be on a wheel, and only touching a wheel. Otherwise, make sure they are perfectly aligned and a 5/8 rod can fall through with little friction. Again, use a bowline knot. Drill the hole accordingly, so that their position is similar to the one pictured below. These are the 2 2 ft. long 2 X 4s. I am making one for a school project and hope to have it done in a week or so. When you look at the picture, they are the big, tall, straight pieces. The wheel axle on the arm was tack welded in place, so that the axle remains stationary with respect to the arm, and only the wheels spin. on Introduction. ), Reply I'll explain later Cut these two twisting braces at around 1 ft 2 inches because the length of these will affect the width between the tops of the two drop channels. I speak Spanish and English, along with English and Spanish. This could be done other ways, but our method looks really cool. This thing is powerful, which is why you need a trigger. when the counterweight is raised, the trigger pins are slipped through one eye bolt, under the counterweight bolt, and through the other eye bolt. Finally, thread the Axle through the other hole in the middle of the arm. SolidWorks was used here, although any CAD software or even a hand sketch would be ok. One advantage of 3D CAD was the ability to make an assembly and ensure a good fit for all the components, as well as smooth motion. You want to keep the width relatively narrow, but wide enough to accommodate whatever projectiles you plan to use. Simulated distance: 316.6 feet. The hardest part, really, is getting the angles correct and then cutting them accurately. I might include them later. *It would be better if the two previous 1 X 6 pieces were 2 X 6, I'll explain later. We built a 1/3 scale model that throws a 1 pound projectiles 340 feet + with 70 pounds of counterweight. How would this work at half the size? I've always wanted one did you ever build a smaller one to start with? we didn't use a simulator for the motion. Here are some stats, note that these apply to the original #2 treb. -Use screws! However, a floating arm trebuchet is more efficient when built to a size of between one meter and five meters,[5] making it suitable for hobbyists and model builders. then, to check we add the short arm and long arm length together: Really, be careful. Position yourself diagonally to the front of the trebuchet. Now comes the moment of truth. Then fold in on top of the other one to crinkle the pouch into a more pouchy shape. 10 1/4 in. I would love to see it while being constructed and finished. On the end of the arm, there will also be a nail, or some sort of strong metal pin. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 The part of the war machine that means business. WebStep 2: Prepare the Arm. Slide the bolt through one hole, screw everything on in this order: War Wolf was the largest trebuchet ever made and was rumored to send boulders of about 150 kilograms across a distance of over 200 meters. these will be used in the trigger Tie it so that it hangs about 12 inches (2.55.1 cm) from the top of the arm. 9. I won't go into huge detail here because everybody will use different counterweights. Basically make a box that can contain your counterweights, (1.8796 m) long 2 X 4 Just make sure there is a washer on any side of a bolt that will be touching wood. Shims may be needed to level out the device. on Step 17. 5. (Should be square to the length of the board, like a crosscut.) Wheels are from the rotating platform from a microwave but any small stong wheel will do. 19. Desktop / mini Catapult. 24. 8 years ago Next tape all outside edges so that the perimeter is completely taped. Now comes the fun part. And it is constructed with 1 X 6s it's smoother, faster, and prevents grooves from wearing in the wood. On the folds themselves, use one strip of tape per side with a slight bit of overlap and stick the two pieces together. Do the same with the bottom of the board, the part that you held against the bending brace. The design and construction of such machines is a popular project assignment in post-secondary engineering classes.[3][4]. The two bits at the open top of the cut channel..keeps the drop channel from "opening" there are small cracks throughout the trebuchet now because I was lazy. Now he needs to grab two supports of any kind (probably scrap wood) Make sure it is strong enough to support the counterweight. Punch two holes. He was right. Otherwise, The arm will get puched over and on top of them, slowing down the arm a lot. 3/8 X 4 eye bolt (Including bolts) There's tons of assumptions involved there (what's the drag coefficient of a pumpkin? 50 pounds that was used here. I did not have a drill bit long enough to go through all of the 2 x 4s of the short arm, so I had to drill individual holes in each individual 2 X 4 and hoped that they lined up. 3.5+1 represents the total length (Short plus long arm). by 2 in (0.381 X 0.0508 m) [2] The projectile can be launched at a high velocity.[6]. BRs of from 3:1 through 8:1 have been used, but at the low end you lose drop and at the high end you run into geometric problems and frame instability. Basically, put them in the corner where the main track supports and the track meet. Make the arm from the 1/2" x 3" x 36" pine board. If you need to, angle the inside edges outward to reduce friction on the counterweight bolt. Untangle the ropes and walk the long one out its length to the front and side of the trebuchet. 12. Essentially, beef up the arm assembly. Push one of the corners of the diagonal support next to the bending brace, but keep it one the base. Okay yes you fire. 13. 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Just cutting away the material the board, like a crosscut. a 10 foot arm what loops the.
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