WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. 1. Also, get the most straight lumber available for the longer pieces on the frame. The Ideally, the arm should be vertical or slightly forward when the sling releases. It includes what I used at the time. Slip the ring over the pin, and stretch the sling lines to get rid of as much slack as possible. 4. 2 segments of 1 ft., 0.5 in. We made ours so that the chain had a tiny bit of slack in it initially, which we took out by tightening the nut on the eye bolt each time we fired. Then bolt on the wheels. 9 years ago Then, obviously, drive in the screws. The arm is done. 15 in. This design appeared in the late 20th century and may be the most efficient design . awesome job! Reply The walking arm trebuchet is a good example, which uses an unconventional design to great effect. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. This is a more efficient way to transfer potential energy into kinetic energy at a small scale. This may need to be changed Thanks! 2. Now, I believe that the width between the bottom of the main track supports is somewhere around 1 ft, 1 inch. 9 years ago This may need to be changed. I'd look around on YouTube and compare different sizes of trebuchets. 9. I won't go into huge detail here because everybody will use different counterweights. Basically make a box that can contain your counterweights, It's 12 feet tall with a 10 foot arm. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9 X 4 in. If this happens, use it on a hill or place two very thin pieces of scrap wood under the base, directly under the drop channels. Buy 15 2 X 4s to start off with, then buy more later. then divide your total beam length by that number. I just so happen to be in the construction phase of an improved floating arm trebuchet. To reset the device, the counterweight must be raised back to the original height and locked in with the trigger mechanism. Socket wrench for your threaded rod We built a trebuchet that we call the medieval stuff chucker (MSC). Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) Just on top of the tracks. The distance that it extends out from the diagonals affects the distance a lot. I really want to build a floating arm trebuchet, so maybe I'll do that between this year and next and we'll have stuff chucking competitions. This is essential for an efficient machine. The trigger will be added later. The knot should be on the inside of the pouch. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. so i need to cut length of everything down to size. long carriage bolts Finally, thread your sling lines through the hole on the outside of the seam to the back, and then through the back to the front. Webof the pivot, mass and inertia of the arm, mass of the projectile, ratio of the pivot/arm's center of gravity, mass of the counterweight, wind speed, and release angle. This is only to coutersink the screws, do not drill the hole all the way through. Again, make sure a 5/8" bolt can easily fall through. 4. Drill a 1/4 hole 20" from one end, in the middle of the board, as shown in Fig. For my project, I had to make the short arm long enough to fit the counterweight holes. It launches 5 pound pumpkins around 320 feet with 250 pounds of counter weight. 6 segments of 2 ft., 5 in. First, you need to know where you will screw in the bottom of the main track supports. 4. To include the sling, a much more constraint-intensive (5DOF) approach is required. (Hopefully a strong someone) Angle iron or steel sheet would work. FDM 3D Printing; SLA 3D Printing; Again, the exact size of the support does not matter, but the long edge should be under 1 ft, 6 in. The trigger pins keep the weight from falling. WebThe 5DOF Floating Arm Trebuchet This is the floating arm trebuchet with a sling. The first recorded use of traction trebuchets appeared in ancient China and were probably used by the Mohists ps-mohist are a scientific lead version of the chinese What is the floating arm Trebuchet, and how does it work? If I need to bring the scale down, what would the dimensions be? Thank you for your generous gift to the DIY community. Whenever you feel like it, slip in the other trigger pin, with the eye toward the front. Push them up against the drop channel. Measure the amount of space in between the drop channels. 6 1/4 in. The original floating arm design originated in modern times, from professional and hobbyist engineers for recreational and educational use. Okay step one. http://youtu.be/MS9OepeTELc, Reply Add the two numbers of your ratio together. also screwdriver bit driving in your screws. 3. Use a bowline knot. The 5/8" CW bolt bent like a taco with only 16 pounds on either side. 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. The pouch also isn't the best. You need: 9 years ago Lower it below the base, just rest it on the floor. Now I'll tell you how to lock load and FIRE! 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! Line up one edge of the bottom of the track with the 2.5 foot mark. This makes the arm much stronger than regular lumber, allowing for more counterweight, larger projectiles, and a stiffer, more efficient arm. Long sides of the base If the weight is very heavy, the long part of the arm can This allows us to swap out pins, or adjust forward and backward. WebThe optimal ratio between the long part of the arm and the short part of the arm will depend mainly on the Mass of Weight. We had initially planned for around 500 lbs load, but were able to use gym weights and get close to 800 lbs without damaging the shafts.Our design required that we load each weight one at a time onto the weight bar using ladders. Next, grab two of the 4 ft 5 in pieces. Then just hammer the dowels all the way into the holes. fourth through fifth picture will show this. I think that's it 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. i need the axle on the end of the throwing arm to slide up and down within the rectangular slot running up and down the center of the main truss. The two marks should be 6/8" apart. Also, the box needs to have a top so the weights don't come flying out when it reaches the bottom of the drop. Ok, now you need to flip over the long (6-ft.) pieces and slide the two foot pieces underneath. The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. This could be done other ways, but our method looks really cool. [2] The projectile can be launched at a high velocity.[6]. (8TH picture) Then tape them in place. 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. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. Different jeans vary, so this next step might be different for you. thank you very much. You can cut the gap wider up to a certain pint, but the trigger design might limit the amount you can cut it wider. 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. When you look at the picture, they are the big, tall, straight pieces. Its 3.5 inch edge should also be 1/4" from the long edge of the 6 ft. long 1 x 6. These keep the arm straight as it is being loaded and dropped. The guide blocks can be any shape you want, but look at the picture notes below for shaping. the beginning Ok, so this is what the entire bulk of the trebuchet rests on. I want a 3.5:1 ratio and 7 ft long total beam. WebFloating Arm Trebuchet. This linear drop of the counterweight is more efficient in transferring potential energy to kinetic energy than the pendulum counterweight motion of a traditional trebuchet. It would be better if both ends were one solid piece of wood. Line the short edge up with the 8 ft piece of the drop channel. (0.635 cm) washers, matching carriage bolts Try to make it as flat and planar as possible, as this will minimize the need for adjustments later. X 3.5 in. Use a washer wherever metal is coming in contact with wood. Still, it was strong enough with all the gorilla tape. *It would be better if the two previous 1 X 6 pieces were 2 X 6, I'll explain later. 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. After the first 25 shots or so with the trebuchet, there were two things apparent: the arm could easily be made longer and could greatly increase the range, and the the CW bolt needed to be made stronger. Make sure there is glue all over them. WebLaser Cut Desktop Trebuchet. And do lots of testing, with a realllllly long trigger string. more on that later. I would like to work on the floating arm trebuchet because the design of it is more interesting and D Check the alignment of the rails and ensure they are relatively close. After looking at the dozens of picture I took, It should be pretty easy to figure out how to put everything together. I have included a link to a hack-up vid I made on youtube in case you're interested. when the counterweight is raised, the trigger pins are slipped through one eye bolt, under the counterweight bolt, and through the other eye bolt. This will be the top. about 250 2.5 in. Thinking *this is not funny only annoying* on Introduction. thank you, Reply I had no idea what the problem was at first. Thorsen said: boohbah said: unfortunately lordbob is no longer with us , he suffered a fatal blow to the temple from a golf ball. Arm-sling constraint, arm roller on fixed track, projectile on ramp. 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. The first picture shows this. Projectiles can fly backwards, so keep people and cars AWAY from this area. upper arm/lower arm length 4 9/16 inch (115mm) / 2 3/32 inch (53mm) Place the weights in the box and screw on the top. (15.24 cm.) Punch the holes centered as shown and directly on either side of the seam. If you want a better pin system, look at the turnbuckle pin system here. This is the pin. As a starting point, cut these two DRILL PILOT HOLES FOR EVERYTHING!!!!!! It was an old rusty double- headed nail. WebThere are no really detailed descriptions of medieval or earlier trebuchets that give, for example, the dimensions or shape of the beam, the ratio of its long arm to its short arm, and so on. Ok, now repeat the entire process mentioned above for the "short" side. Tighten the bolt as much as you can. Drill the hole accordingly, so that their position is similar to the one pictured below. 19. 3. Make them small as possible, but make sure they can still guide the arm until its wheels hit the track. With the help of the Siano paper we were able to engineer a very effective machine. (0.2413 X 0.2286m) on Introduction, On the working model simulator how do you make the sling release at 45 degree, Reply Tie it so that it hangs about 12 inches (2.55.1 cm) from the top of the arm. on Step 17, Hey, I definitely encourage you to do this! Make the long arm lighter. Then cut the axle about 3 inches shorter than the width. Consider how much weight you want to use, and size your shafts and frame accordingly. 8. Threee previous sections are for the counterweight boxes. (I had no idea what else to finish it off with. Upon releasing the trigger, the counterweight is allowed to drop through the channel. You also will need to push them out slightly, so that the gap is 3/4" at least. 6. (2.54 cm.) 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. This, in turn, changes the width of the drop channels to narrow (BAD) or widen (usually better). Platform is pine. It shouldn't be too deep or to shallow for your projectile, and should hug the surface of your projectile well. Lastly, cut through the plywood rectangle so the wheel does not bump over the edge of the plywood as the arm falls. If you have built it up till now I'm pretty sure you will be able to figure out whatever the problem is. NOW AND ONLY NOW take out the safety blocks. Don't judge me) 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. Take a break. Arm-sling constraint, arm on fixed roller, projectile above ramp. For the trigger you will need the: WebThe Floating Arm Trebuchet: The floating arm trebuchet is a modern take on an ancient war machine. 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 20 yell heads up, countdown , just make sure everyone know you are firing. These are the four sections of 1 ft, 5 in 2 X 6. Put them in that corner, towards the inside. If you are going to use a shorter ratio, such as 3.5 : 1, make the short arm pieces shorter. I don't really know what I'm talking about. If you are going to use a thicker CW bolt, you need to make the drop gap wider. Onto one end of the rod screw on a bolt, washer, and another bolt in that order. 7 4.5= about 1.6 Smash many pumpkins.Note:Time was of the essence on this project. *A few notes: the angles were based off of the sketchup model which had a few errors. Okay now you need to cut the axle. 2 segments of 5 ft., 10 in (1.7272 m) long 2 X 4 As far as we know, its the largest floating arm ever built by youths, and the largest wooden floating arm trebuchet in existance.The arm is 18 feet long, we use a 1.5 inch steel bar, and can load it up to about 800 pounds. First, I'm going to talk about some other improvements that are more important than the arm. it's smoother, faster, and prevents grooves from wearing in the wood. You only want enough of the bolt so that after it comes out of the arm there is only enough room on either side of the bolt for a 3 washers, 2 bolts and the entire wheel assembly. i was hoping you could tell me what the release system was rated for and if you have any recommendations on where i can acquire a quick release, 8 years ago Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. The person on the trebuchet needs to push back on the arm so the person on the ground can reach it. COMMENT RATE May need to be made thicker We're all a bit nerdy and geeky and figured a weekend engineering challenge was a good way to make camping and drinking more awesome. I'm nearly done with the trebuchet but I'm having trouble understanding the sling. First, obviously, just lay the arm in between the drop channels (Just the middle of the treb) Basically, put them in the corner where the main track supports and the track meet. I really appreciate your work in building this instructable. on Introduction. 4. slide the bolt the rest of the way through the other hole. (Order from inside to outside.) Awesome! The second length of rope is tied to a small ring- like a loose keychain ring. Do some experiments, that part is the most fun. Once they are pulled, they do not interfere with the motion of the arm. 2 rectangles of 3/4" in. I'm still not sure. This one is pretty bad. Trebuchet. The chain link on the opposite end should click into the door release easily. In contrast, a floating arm trebuchet features an axle on the arm freely moving along a horizontal glide track. denim fabric 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. The classic beam ratio for a FAT is 2:1. On the arm, drill a hole for an eye bolt, and use a washer on both ends. I would probably actually be dead. 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. Well, for me, it wasn't really a chute. on Introduction. Mortise and tenon joints here would be best, but I didn't feel like they were necessary. Otherwise, I'd probably have a concussion because the folding trigger design released before we wanted it to. Drill the holes for the eye bolts. You should also cut off the head if you keep getting downward throws no matter how you adjust it. Cut at least 3 inches longer unless you are very good at cutting angles accurately (A miter saw would help)\ ALSO, the base boards (I used 1 X 6) should be thickened. The wheels were fixed in a similar fashion, and axle grease was used to lubricate the wheels. I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. Documentation. This will be the finger end of the arm. 8. If you have a certain ratio in mind but you do not know the lengths, use this example: 8 matching cut washers I lined up the holes with the dowels and hammered home. at this point, we used a ratchet to tighten the eye bolt, until the chain was in tension and the weight bar no longer made contact with the safety bars. (1.3462 m) long 2 X 4 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. The arm is on a moving axle and the torqueD|volume=26|doi=10.1088/0143-0807/26/4/002|issue=4}} The forward motion of the axle as the arm rotates adds speed to the projectile end of the arm. (0.7112 X 0.0889 m) First, grab two of the 8 foot long pieces. Tighten all the knots and make sure none will slip. This step is fairly simple. It's the same process of cutting slits, hammering out the wood and sanding it smooth. 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. A solid metal ring of any kind would work better. Otherwise, the counterweights would just stop like the safety makes it do (Second clip in the video in the first step) have a nice day This new and improved 21st century version of the trebuchet uses a modern understanding of physics and engineering principles for incredible power and range! ), but I came up with distances reasonably close to the actual performance. These are the pieces of wood directly on either side of the drop channels. (Diagonally). 5.6 + 1.6 = 7.2. The principle behind this device is that the counter weight moves only vertically as the arm's axis moves along a horizontal rail on wheels. Could be built in probably a few weekends. wood screws, phillips head drive, #8 X 6.5 in (38.1 X 16.51 cm.) Just in case you didn't know drip some wood glue into the holes, and put glue all over the dowels. The bottom is the side where the 2 ft 1 X 6 overlaps the long 1 X 6. This was a bit too heavy as we had to load each weight manually to fire our trebuchet. Without the other, the tracks may not be aligned or the width of the drop channels might narrow or widen (Not staying even= bad) Lumber Now, to attach it: Imagine the pouch itself. These make up the short arm WebThis is a floating arm trebuchet. For them to fit, I had to cut different lengths off of the diagonal supports. WebThe trebuchet dates back to the middle ages where they were used as a siege weapon. 2. You should have a " Y " shape rope with a trigger pin on each end. Start by cutting the pieces of plywood. 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. Did you make this project? (0.635 cm) bolts, matching thread We are building one now, it has been lots of fun for the family. If the weights are extremely heavy, though, you may want to keep the weights out of the box for now, since when you load it you will have to lift it. None seem to affect it structurally, but we'll see. they would be horizontal, not angled. They have cutouts on them so that they can be screwed directly onto the base with their 2 ft. long edge flush with the outside 2 ft. edge of the short 1 X 6. Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. May need to be hanged if the diameter of the threaded rod is changed Use the order of bolts and washers on either side shown in the first picture (From inside to outside the order is) : drop channel, washer, bolt, washer, CW box wall, Washer, bolt, Bolt, washer, wall of CW box, washer, bolt. (1.5875 cm.) Approx 25 ft. (7.62 m)1/2 braided nylon rope The arm slowed down a lot, and the ball spit out the back. 7 years ago (Left or right) Look at the pictures for alignment. Have someone stand at the back of the trebuchet, next to the arm (To the side) 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 9 in. Allow about 1 week before firing your trebuchet. What did you finally use for the rollers? This is a general description of how to create a floating arm (f2k) trebuchet. Lastly, drill a hole through both the walls of each box at least two inches from the top edge for the counterweight bolt. WebFloating Arm Trebuchet - Hobbyist Version The F.A.T. -Make sure it is strong enough to take the force of your falling counterweight. Place your projectile in the sling. The first picture shows what this looks like. The pinis crap. Miter off one end of each at a 30 degree angle (with respect to the length of the board) This angle just makes it look cooler. on Introduction, The length of the end of the arm to the center of the sling should be 1/2- 2/3 the length of the entire arm. (0.635 cm) diameter, 6 in. Grab your nylon rope and cut 4 feet off the end. Now comes the moment of truth. Summary The floating-arm trebuchet, a modern variation of a medieval weapon, is a popular project for physics and engineering instructors.We develop and analyze a model of this device as an introduction to constrained Lagrangian dynamics. For me, for the side with the longer support, this was about 5 ft, 7 inches from the very bottom of the drop channel. 3. Ok lets get started. and if everyone wants the step I'll add it. Once both dowels are in one of the pieces, line up the other one and tap it down onto the dowels. These are the 2 2 ft. long 2 X 4s. Because we are about to cut the tracks in half. For the weight I used ( 36 pounds) a 5/8" HARDENED STEEL rod MIGHT work. Desktop / mini Catapult. For each track support, you should use 3 of the 2.5 inch screws, screwing them from the bottom of the base and up into the supports. the arm itself Make sure all the hardware can support whatever CW you are using. I won't tell you which one was the best yet, although you can probably guess. (1.5875 cm.) I'm kinda adding these as I think of them.. I like the adjustable arm ratio. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. In response to urbanmx, this was our very first trebuchet. WebThe short arm/ long arm ratio is what I was testing, and the different ratios are 2:1, 2.5:1, 3:1 and 3.5:1. (0.635 cm) washers, matching carriage bolts I'm sure this pouch design could be improved. for the carriage bolts therobotichand, would you mind posting any materials or tutorials you used? 1. If anyone takes the time to do a thorough dynamic analysis on an F2K trebuchet, and would like to share their results, please post them below. The Floating Arm Trebuchet. It should be drilled all the way through the flatter 3.5 inch edge side. Unlike now, the humans pulled ropes instead of having a counter weight. At least i think. ratio of counter weight to projectile about 90 to 1 weight. 1. for the sling You may even be able to get away with less. I've definitely seen some trebuchets in that size range throwing tennis balls, 6" steel shot, etc very far. Lengths Lengths Angles Masses Density Copyright 2013, Eric Constans and Rowan University (1.8796 m) long 2 X 4 Trebuchet. i need to make mine 3x3x3. Take off the drop channels completely so you can cut through here. Did you make this project? If not, just measure the distances on each piece as accurately as you can. Bolt on the CW boxes. To cut the tracks, mark a 3/4" gap that is aligned with the drop channel gap and the support directly below. 8 years ago The cutouts go around the main track supports. Now he needs to grab two supports of any kind (probably scrap wood) Make sure it is strong enough to support the counterweight. 2 hand weights, 8 lbs (3.63 kilos)* Once smooth motion is achieved, begin adding weight, but do not fire anything until a max weight test is done. 2. Alternatively, you could download the sketchup model, highlight the entire thing, scale it down and get the dimensions directly from there. For the diagonals you will need the 12. Here, we followed the dimensions on the drawing and cut very precisely. 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 box should have a bottom that is "outside" the walls, screwed in from this bottom and into the walls, not through the walls and into the bottom. Our team devised a problem statement: Design and construct a launching device to maximize the horizontal (0.635 cm) bolts, matching thread Weld the inserts carefully to the plates, ensuring the axis of each insert is as close to normal (90) from the plate as possible. Tie the longer end of the rope through the hole in the end of the arm. I may or may not fget a response considering it is 2013 and not 2010 but I need to build a trebuchet for my physics class and i came across your model and had a few questions. 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