these will be used in the trigger Basically, put them in the corner where the main track supports and the track meet. (I saw a car roof get crushed by a pumpkin flying backwards)Use a long trigger rope and keep yourself at a safe distance.Have fun. Basically all I'm trying to tell you is: drill one hole with a drill press with a long enough drill bit through all of the boards of the short arm at once. Best catapult ever (98 ft) Load more 3D Printer Info. Arm-sling constraint, arm on fixed roller, projectile above ramp. 2. That should be about 2 inches from the end of the track. This new and improved 21st century version of the trebuchet uses a modern understanding of physics and engineering principles for incredible power and range! 20 yell heads up, countdown , just make sure everyone know you are firing. I would still recommend doing one, though. 1. (Diagonally). WebA trebuchet is a device used in the Middle Ages to launch very heavy objects at opponents during battle. First, pick one end of the trebuchet to be the back. X 6.5 in (38.1 X 16.51 cm.) WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. Threee previous sections are for the counterweight boxes. This would eliminate cracking and make the drop channel much stronger. A mortise and tenon joint would have also probably worked. The 5/8" CW bolt bent like a taco with only 16 pounds on either side. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. Projectiles can fly backwards, so keep people and cars AWAY from this area. Also, get the most straight lumber available for the longer pieces on the frame. Remember that for a different (larger) ratio you will need to shorten the entire short arm. And it is constructed with 1 X 6s For the arm assembly on Introduction. 3. I have no clue what it is for f2k, but it is a more efficient trebuchet. The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. Thank you for your generous gift to the DIY community. Use a washer wherever metal is coming in contact with wood. Image by Ron L. Toms. The arm can be longer than your sheet of wood, but make sure the gaps between the pieces are in different spots for each layer. Use three screws in every place that the diagonal touches the track or support. While a regular trebuchet and floating arm trebuchet both drop a counterweight from only slightly above their pivot points, a FAKA trebuchet drops a counterweight from nearly 2 arm lengths above the ground, giving it more potential energy, thus allowing projectiles to be fired a greater distance. Their defining feature is free movement of an axle on the throwing arm, and a linear drop channel for the counterweight. (8TH picture) Then tape them in place. nut, washer, guide block, wheel and bearings (Go together) , guide block, washer, nut. First, obviously, just lay the arm in between the drop channels (Just the middle of the treb) If you really want to include them, they should also be cut about 3 inches longer, until you know what to cut. To cut the tracks, mark a 3/4" gap that is aligned with the drop channel gap and the support directly below. Next, grab you trigger pin and just hold it beneath the CW bolt. Record the next shot if the first one does not go well. Thank you for reading through all this, and let me know if you actually build this monster!! Although they need to be lined up, don't worry too much about the squareness of the main track supports to the base, since that will be corrected by diagonal pieces, from the track supports to the track itself. Oh, and the arm itself. these are the trigger pinsWheels, weights 7. The arm extension is added onto the rest of the arm with three different methods. Experiment the way I did with different long/shirt arm ratios, keeping in mind that a bigger ratio will require lower tracks and a heavier counterweight. (0.3175 m) long 2 X 4 FIRST PROBLEM This way, the screws take force from top to bottom, not sideways. Virtual Trebuchet is a free web based trebuchet simulator. [2] The projectile can be launched at a high velocity.[6]. 2 hand weights, 10 lbs (4.54 kilos)* Fill the bucket with rocks or heavy pieces of metal. Did you make this project? Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. (1.5875 cm.) The trigger pins keep the weight from falling. To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism. Their defining feature is free movement of an axle on the For this you will need your circular saw, sander and the claw hammer if you don't have a router. 50 pounds that was used here. MAKE SURE THE EYE OF THE TRIGGER PIN IS FACING THE FRONT OF THE TREBUCHET otherwise you will have to switch it. Remember that these adjust the front half of the tracks, the next bit adjusts the back. 9. Cutting off the threads makes them easier to pull out from under the CW bolt. Reply It has two ropes coming off it, one in either direction. 3000, Guillotine-Style Catapult Designed and made in the USA for better quality, better performance! Approx. WebThis is a floating arm trebuchet. the next 3 specifically show the dimensions for the short side. The classic beam ratio for a FAT is 2:1. You should have 21 feet left. These Are not included in the instructable because I did not think they were necessary. but if you didn't (my bad) You need to recut the drop gap to 1/8" wider than the CW bar, cut the gap in the track slightly wider, and spread apart the track supports directly underneath the drop gap. common tools It should be easy enough to follow. grab the last 3 ft, 6 in 2 X 4s. Plywood also included in the arm Please comment for any Remember to shorten the short arm pieces if you are using a larger ratio that will need to make it shorter. I don't really know what I'm talking about. The frame is made of 4x4 held together with deck screws and carriage bolts, and our design allowed for the frame to be removed from the base with bolts only. You will need the two 2- foot lengths of 1 X 6 and the two 6- foot lengths of the 1 X 6. Feel free to use them for educational or personal use. About: Mechanical Engineer in the machine design industry. The medieval trebuchet is a missile-throwing device, with a heavy counterweight on the short end of a beam that pivots about an axle fixed to a supporting frame. Pretty nice, but you could get a lot more power by lowering your tracks by about a foot. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. "Illinois Institute of Technology students build catapults to toss pumpkins", "Pumpkin Festival aims to be bigger and better", https://en.wikipedia.org/w/index.php?title=Floating_arm_trebuchet&oldid=1126960959, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 12 December 2022, at 04:31. 12. more on that later. Grab your nylon rope and cut 4 feet off the end. WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. Use the top bolt for screwing in, and the bottom one for unscrewing. Without one of them , the arm would simply fall into the ground. so i need to cut length of everything down to size. Take off the drop channels completely so you can cut through here. Just get several throught the drop channel assembly and into the track. Build a good study base using 2x4 and plywood. 2. Ok, so this is what the entire bulk of the trebuchet rests on. It's 6 feet long and 2 feet wide. And it is constructed with 1 X 6s That's its fa Just in case you didn't know Width was around 2 feet, I think. So, cut the first twisting brace, on the very front, as wide or narrow as you need it to keep the drop channels straight. Mortise and tenon joints here would be best, but I didn't feel like they were necessary. Drill a 1/4 hole 20" from one end, in the middle of the board, as shown in Fig. http://mort11.org/pumpkinalso be sure to check out the rest of our website, FIRST is a great program for anyone interested in engineering! I lined up the holes with the dowels and hammered home. less than on a longer, heavier arm, so you have more of an opportunity to make it extremely light, if that makes any sense. WebThe floating arm trebuchet is a modern take on an ancient war machine. Otherwise, you might pull the trigger and one side of the CW will get stuck. So I'm still not sure if i should add it. A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. To fix this, you get a thicker CW bolt, and hopefully a hardened one. Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. No specimens or models from medieval times survive. Drive 2 screws through the drop channels and into the supports. By tightening these outside bolts, you can change the alignment of the tracks and narrow or widen the distance between the drop channels. Once they are pulled, they do not interfere with the motion of the arm. I had no idea what the problem was at first. 8 years ago. The person on the trebuchet needs to push back on the arm so the person on the ground can reach it. 2 segments of 2 ft (0.6096 m) 1 X 6 You will later put more screws into the half-lap area, so the joint is not only held together by these screws. Okay now you need to cut the axle. Again, the exact size of the support does not matter, but the long edge should be under 1 ft, 6 in. 2 segments of 8 ft (2.4384 m) long 2 X 4 Tie the longer end of the rope through the hole in the end of the arm. WebFloating Arm Trebuchet. 18. Keep pulling back on the arm until the counterweight bolt is about 3 inches over the topside of the tracks. Our shafts were steel bar. Socket wrench for your threaded rod Our sling (not pictured, there is a shot of it in the video) was made of woven nylon web straps. [2] The eye bolts are usually placed at the bottom of the frame, locking above the arm to prevent accidental release. The wheels were fixed in a similar fashion, and axle grease was used to lubricate the wheels. This is only to coutersink the screws, do not drill the hole all the way through. 2 segments of 2 ft. (0.6096 m) long 2 X 4 These are the horizontal beams that are used as the track. This allows us to swap out pins, or adjust forward and backward. You may even be able to get away with less. I will be launching this in a range 200yds and I'm looking to toss under that because I will be demonstrating my trebuchet about 50yds or so from a football field and I will be tossing the weight towards the field and at the other end is a parking lot. 10 years ago And, I'm not looking to chuck this 200yds. For me, this was a little more than halfway through the side pieces. I'm pretty sure I made my dowels 1/2" wide and 8 inches long. 3/8 X 4 eye bolt (Including bolts) 6 segments of 2 ft., 5 in. But make sure you go to the website for wheels that I recommended in the Instructable to avoid paying too much for wheels. I speak Spanish and English, along with English and Spanish. It was determined that the optimal arm length ratio was approximately 1:2, where the short It would also bend out of position because of the force of the swinging projectile. on Introduction, do you have the exact dimensions of the final product. Jump to page: DocBrown. As a starting point, cut these two Next center the arm itself in the middle of the drop channels, so there is the same amount of space between the arm and the drop channels on either side. To reduce friction of the sling on the launch track, the track should have a smooth surface.[5]. *look at the last step: improvements. (0.635 cm) bolts, matching thread I would love to see it while being constructed and finished. A thin steel cable might work better.Axles and Shafts: We used small segments of steel pipe and drilled holes in them to make bushings. 10 years ago Please help because this project is due the 20th. How would this work at half the size? Mark this height. The two bits at the open top of the cut channel..keeps the drop channel from "opening" I won't tell you which one was the best yet, although you can probably guess. 20 5/8 in. User Projects. The key ratio of an arm is anywere between 3:1 and 5:1. 3 3 in. This is the pin. [9] These machines and their designers are frequently to be found competing in various recreational events, for example, pumpkin chucking contests.[10][11][12]. We actually did not have motion software, we just looked at lots of YouTube videos. *It would be better if the two previous 1 X 6 pieces were 2 X 6, I'll explain later. 1). You also want to keep the track in a straight line, otherwise the wheels will fall off the edge. Share it with us! You need to lift the counterweight to the height of the supports so your friend can get them just underneath the CW bar. Drill holes every 6 inches into the mitered pieces deep enough so that the wood screws can penetrate the drop guides itself. Position them in between the two main track supports and trace a line as best as you can along where they overlap; this is where you will cut the half-lap. Make sure that the washer in between the CW box and the drop channel is not caught on the bolts protruding from the eye bolts (Trigger pin holder.. things) Make sure it will be able to fall freely, But do not remove the safety yet. on Step 15, This is stellar. Lastly, drill a hole through both the walls of each box at least two inches from the top edge for the counterweight bolt. This list of materials is copied directly from my science fair project. Then just hammer the dowels all the way into the holes. it just over 24 inches tall I can provide more detailed dimensions, advice, and tips if you wish, just let me know. 9 years ago They are basically the same things as the 2 x 6 diagonals except they are 2 X 4 and they have more half-laps cut in them. To cut the half- lap, refer to step 1. Simulated distance: 316.6 feet. Flexing will be reduced and you will have a stronger base to work with. Put the ratio hole wherever it goes. Additionally, the bending of the CW bolt meant that it was not perfectly aligned with the drop gap, so it would slow down and bump on the way down. (0.889 m) long 2 X 6 Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. Thats a bit longer than 7 feet because i rounded 7 4.5 up, it was really 1.55555555 11 years ago Now, let's get started actually building and attaching them. (Order from inside to outside.) Axel for the masses is coathanger wire but ensure the axel never absobs the full impact of the falling masses as it will bend. The base is finished. The first picture shows this. You should use 2 X 6s, or something stronger than a 1 x 6. Try to figure out where to put the 3/8" eye bolts so that you can raise the CW bolt all the way to the top, But make sure there is enough room for the trigger pin to go through and under easily. Unfortunately, there were some problems in the sketchup base that I made (and could not be easily corrected) that threw off a couple of measurements. Here's some vid of ours. This is a general description of how to create a floating arm (f2k) trebuchet. Again, cutting these pieces shorter will narrow the track and cutting them longer will widen it. Lemme know how to improve the instructable Use a door release mechanism from a car for your trigger. Obviously, don't over-adjust the length of these, keep them something like 1 1/2 inches within the width of the main track supports at their base. (1.5875 cm.) Our arm was made of many pieces of layered plywood held together with resin and deck screws. That was bad. Lay them on top of one another, making sure the edges line up. Stick a few inches of tape over that area, making sure you get it on the inside and outside of the seam. This still does not include the 2 X 6 pieces or any other pieces of plywood. There are plenty of places you can go on the internet to look for better ideas. The angles shown in the pictures are based off of the sketchup model, but they seem to be correct. use your head before you lose your head. NOW AND ONLY NOW take out the safety blocks. I have no idea if this is the most ideal design for this type of trebuchet. 1. cut off about 8 inches from the leg of the jeans. hacksaw if you don't have a METAL CUTTING BLADE FOR YOUR JIGSAW, First, the two pieces are drilled and doweled. Fairly simple trigger design. Keep the hole in between the main track supports and the diagonal track supports. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 He can back away. Essentially, beef up the arm assembly. Now you simply lay the 6 ft pieces across the supports, lining up the edges, and drive three of the 2.5 inch screws into through the track and into the supports. 6 1/4 in. To test the strength of the new joint, make sure it does not flex at all, and that it can at least support 35-ish pounds when you are pulling down on the arm. It will prevent frame strikes, jams and other problems later on. Drill through the entire thing horizontally for the bolt holes. Ok lets get started. So, This project is not due until sometime in may, but I will be glad to post pictures. This will stop fraying and make it more solid. The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. Luckily, I eventually lined up the holes. OK onto step 1 2 segments of 6 ft., 2 in. I've definitely seen some trebuchets in that size range throwing tennis balls, 6" steel shot, etc very far. I really appreciate your work in building this instructable. For them to fit, I had to cut different lengths off of the diagonal supports. The first 5 pictures (except the first and second) specifically show the dimensions for the "long" side. Lean the supports in towards the drop channel as they go up so they don't slip out. To include the Licensed under CC BY 3.0, via Wikimedia Make sure the washers do not interfere with the drop channel. i will keep that in mind. .and several of the bolts for the 5/8" threaded rod. Make sure your projectile is in the sling (Yes we do forget that a lot) the ring is on the pin, the CW bolt won't get stuck on the eye bolts coming out of the drop channels and that the safety blocks are still in, along with the weights (Obviously) 5.Next find the center of the folded edges. To include the sling, a much more constraint-intensive (5DOF) approach is required. Arm-sling constraint, arm roller on fixed track, projectile above ramp. Just find a pair of old jeans Ideally, the arm should be vertical or slightly forward when the sling releases. -----------(pouch)----------- One end is tied through a hole that's drilled in the end of the arm. Next tape all outside edges so that the perimeter is completely taped. 4. So now we're going to add some extra supports that will prevent the 2 ft 1 X 6 from bending, Lateral support and extra track support. 1. Bending (KE = .5*GPE, so .5mv^2=.5mgh) Solve for the velocity. Simply miter off each edge at a 45 degree angle, so that the piece is the shape of a trapezoid. simplest step. Avoid contact with the arm as much as possible, they are only there to guide. Consider cost and use whatever spare or donated materials you can find. There's tons of assumptions involved there (what's the drag coefficient of a pumpkin? So bad. You should have a " Y " shape rope with a trigger pin on each end. 4.5 A four foot piece and 21 foot piece. Ok, find a flat surface and 3 scrap pieces of 2 X 4. Basically make a box that can contain your counterweights, whatever they are. Next, going to the back of the frame, we have the guide wheel and the guide blocks. I've made the pouch and strung one side through but from then on I'm lost. Slip the ring over the pin, and stretch the sling lines to get rid of as much slack as possible. Otherwise, the washers in between the CW box and the channel will be smooshed up against the drop channel, creating friction, which is bad. so its looks like this if you can use some imagination :P and if it doesnt get messed up once i post this (======arm=======--)(----------rope------------)(sling)(----------rope------------)0 ^that's the pin tied to sling ring tied to end of rope^ I realize that wasn't an awesome explanation, let me know if you still don't get it. 2 1/2 X 10 eye bolts Have to build a Treb (much smaller scale), for physics assignment - any advice, for height restrictions of 60cm (just under 24inch) and area of base 900squared cm (just under 140 square inch) - to throw golf ball minimum 100 feet - done some research and most suggest floating arm mechanism would be better option? This step is fairly simple. The thicker the better to prevent it from bending. 3. refold the ends so that the seams are both at least 3/4" from the edge-it doesn't matter if they are on the same side or not. This could be done other ways, but our method looks really cool. Well, they didn't becasue I did not have a drill press. Today they are used mostly for recreation and education. Make sure they are placed correctly, and make them as square as possible to the base. 5. 8. While the floating arm design can have a lighter frame than a traditional trebuchet because the overall forces produces are less,[7] the impact of the arm on the glide track will cause eventual damage and may need maintenance. the short arm is the 1 (In the ratio) and the long arm is the 3.5 (in the ratio) -3.5 times longer than the short arm. Really hope we get the hooks and sling parts to make trebuchets wor 2. More diagonal supports. These make up the short arm This was done with the safety bars in place, as well as the chain clicked into the trigger. Its 3.5 inch edge should also be 1/4" from the long edge of the 6 ft. long 1 x 6. For the arm assembly 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. Scribe the line all the way down the length of the board. Bolt on the CW boxes. The ball did slip out a few times. Yes I want a small one for the classroom and large one for the field. for the threaded rod The aluminum support pieces are not necessary if the trebuchet is short enough or the CW is very light- if you can raise the cw to the top in one shot, g4u.

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