Ask me if you have a question. Additionally, I would make the arm as long as possible as well. If I need to bring the scale down, what would the dimensions be? 50 ft. (15.34 m) of 3/16 (0.47625 cm) braided polyester cord (I had no idea what else to finish it off with. These Are not included in the instructable because I did not think they were necessary. be safe MATERIALS LIST: -Lumber (4x4, 2x4, plywood) -Deck Screws (lots of them) -Carriage bolts, nuts, washers -all thread, 1/2", 1ft sections (for sling pins) -Harmonic Balancers ~7" dia (4X) -Steel Shafts, various diameters -Steel pipe, appropriate mating diameters to shafts -Bolts for bushings -Concrete (450+ lbs) and circular forms (OR just use gym weights) -Steel plates -Steel chain, 1900lb test, 3-4ft -Door latch mechanism from a car -Nylon rope (or other strong rope/cable) -Nylon webbing for sling -Axle grease -Welding equipment -Grinder -Drill press -Carpentry tools -Paint (optional). your best bet is to experiment with different sling lengths and pin angles. Yes, I decided to add this step after awhile. This will be the finger end of the arm. 1. (8TH picture) Then tape them in place. 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 If they protrude into the channel, cut it small enough to fit only on the wood on the side. If you need to beef things up, like the counterweight bolt and wheels, it might cost more. Just as a reminderremember to add glue Otherwise, you might pull the trigger and one side of the CW will get stuck. 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. The CW bolt MUSTbe made thicker and stronger, otherwise it will bend and cause problems. ) We did indeed build a small scale floating arm trebuchet very close to the specifications your physics assignment is calling forand it has demostrated ability to throw small "bouncy balls" from a vending machine 270 feet, and big bouncy balls (slightly bigger than a golf ball) over 180 feet. 6 1/4 in. But I'm sure you'll get the idea. User Projects. [2] The projectile can be launched at a high velocity.[6]. Yeah, this happened to me. So I'm still not sure if i should add it. 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. He can back away. simplest step. washers -----------(pouch)----------- One end is tied through a hole that's drilled in the end of the arm. (Flanges would work here as an alternative) We added a tapered cut to the arm, going from 4x8 to 4x4 at the tip. On average these machines could fling material of 350 pounds onto an enemy territory. 19. 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. Try to have all the sizes of your shafts and designs for your trigger and sling release figured out at this stage, as well as how you plan to attach the shafts (welds or flanges, etc). (KE = .5*GPE, so .5mv^2=.5mgh) Solve for the velocity. 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. 91.4 meters. The picture shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws. Make the arm from the 1/2" x 3" x 36" pine board. It would be better if both ends were one solid piece of wood. 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. It is scaled using the data of skullmech;s trebuchet, but taller as we had no hieght restriction. There are plenty of places you can go on the internet to look for better ideas. The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. I had to add them later. 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. These keep the distance between the two tracks from narrowing or widening. The arm extension is added onto the rest of the arm with three different methods. For the weight I used ( 36 pounds) a 5/8" HARDENED STEEL rod MIGHT work. 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. Drill a hole horizontally and squarely directly through the track. Remember to shorten the short arm pieces if you are using a larger ratio that will need to make it shorter. What I do not Next we have the drop channel supports. May need to be hanged if the diameter of the threaded rod is changed thank you, Reply Tie the each end of the four foot piece to one of the trigger pins. Make them small as possible, but make sure they can still guide the arm until its wheels hit the track. 3/8 X 4 eye bolt (Including bolts) On the folds themselves, use one strip of tape per side with a slight bit of overlap and stick the two pieces together. http://youtu.be/MS9OepeTELc, Reply At the current position they dont utilize all of the work you did lifting your weights.Here is a floating arm that two other students and I from FRC team 11 MORT designed for punkin chunkin in Delaware. This would eliminate cracking and make the drop channel much stronger. It takes awhile to calibrate the different lengths and ratios to reach optimal firing capabilities. Ok, find a flat surface and 3 scrap pieces of 2 X 4. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. This is it. I haven't noticed any cracking with a 1 pound weight being fired at full speed, but a 6 lb weight will exert much more force on the arm because of its higher inertia.. Also, 1 inch thick wood would would be stronger.Hardware One thick nail. I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. The arm wasn't too hard to extend, BUT whatever you use to join the parts MUST be strong enough. This might change depending on your weights setup. 9 years ago NEEDS TO BE MADE THICKER: LOOK AT IMPROVEMENTS The Cardan gear was invented to accept linear motion from a steam piston to create circular motion. Lastly, cut through the plywood rectangle so the wheel does not bump over the edge of the plywood as the arm falls. Unless one eye bolt cannot support the weight, relax. Fairly simple trigger design. You should use 2 X 6s, or something stronger than a 1 x 6. Advertisement By: Nathan Chandler Floating bridges are uncommon in large part because the kinds of situations and environmental criteria for them are unusual. Thats a bit longer than 7 feet because i rounded 7 4.5 up, it was really 1.55555555 6 1/4 in. 2. Bending Braces. It was determined that the optimal arm length ratio was approximately 1:2, where the short The chain was then loosened again, the weights removed, and the arm cocked and locked with the safety bars again, and the cycle repeats.We chose to paint our trebuchet and stencil our school logo onto it, but this is just for looks.IMPORTANT: Safety is crucial when firing trebuchets. If the shot releases at the wrong time, adjust the pin angle. A friend and I are making trebuchet that seems to be about the same size. Reply Again, the lengths can be changed slightly, but you want at least 22 feet of length away from the trigger pins when you fire. Whenever you feel like it, slip in the other trigger pin, with the eye toward the front. 7. To cut the tracks, mark a 3/4" gap that is aligned with the drop channel gap and the support directly below. You need to find the angle to cut the board at so that it will be straight against the edge of the mitered side support. 12. Thanks for the great instructable! More diagonal supports. WebThis is a floating arm trebuchet. To launch such a heavy projectile will require much more weight than the approx. I will be modeling my trebuchet after your and would like to know Can the trebuchet launch a 2-lb dumbell? This film is made to demonstrate some easy steps to go through when making a FAT (Floating arm trebuchet). Use a drill press if you are going to drill one hole because one hole needs to be better aligned than a bunch of smaller ones. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 9 in. Ensure that the shafts you choose have a diameter that mates well with your inside wheel diameter, as well as your inserts. Center the wheel in the middle of the guide blocks and the wheel with the guide blocks in the middle of the tracks. You can cut the gap wider up to a certain pint, but the trigger design might limit the amount you can cut it wider. 22. still thinking. Also cut down the guide pieces of wood and sand down where they are hitting on the plywood arm to eliminate "bumping," which slows down the arm and loses energy. Our team devised a problem statement: Design and construct a launching device to maximize the horizontal WebThe trebuchet dates back to the middle ages where they were used as a siege weapon. I used the trebuchet frame as a fulcrum to lift it in the air. First, obviously, just lay the arm in between the drop channels (Just the middle of the treb) Cutting off the threads makes them easier to pull out from under the CW bolt. Place the tips of these boards 1 foot from the end with the tiny rectangle of wood. 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. If you see or hear bumping, look carefully at this back area w/ a video camera or just your eyes to see why it's doing that. WebA floating arm trebuchet's arm is mounted on wheels that roll on a track parallel to the ground, with a counterweight that falls vertically, allowing for greater efficiency by increasing the proportion of energy transferred to the projectile. To fix this, you get a thicker CW bolt, and hopefully a hardened one. 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. It's a little bit tricky to get the angles perfect. (Order from inside to outside.) If you really want to include them, they should also be cut about 3 inches longer, until you know what to cut. i will keep that in mind. Allow about 1 week before firing your trebuchet. *Basically you just want enough layers of tape around the rope holes so nothing rips, and so that the rope doesn't pull out of the holes. The more you pull the edge over the other one, the deeper the pouch will be. Circuits | Floating Arm Trebuchet : 7 Steps (with Pictures) - Instructables I'd look around on YouTube and compare different sizes of trebuchets. This is the only part of the trebcuhet that can vary a lot. Then, measure 3/8" from either side of this mark. on Introduction. 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. 8 years ago This will be the top. The person on the trebuchet needs to push back on the arm so the person on the ground can reach it. 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. Do you have any instructions or tips perhaps? Lengths Lengths Angles Masses Density Copyright 2013, Eric Constans and Rowan University It shouldn't be too deep or to shallow for your projectile, and should hug the surface of your projectile well. This is the pin. 2 hand weights, 10 lbs (4.54 kilos)* 4 segments of 4 ft., 5 in. [2] This pulls the counterweight upwards slightly after a launch. 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. Width was around 2 feet, I think. Really cheap, really fun. For the arm assembly Mark this height. Do you still have the Matlab file? Need some advice please. This may need to be changed. 9 years ago 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? They would extend outward, just like the board chute. for the carriage bolts Remember you need to make two of these. Cut at least 3 inches longer unless you are very good at cutting angles accurately (A miter saw would help)\ And as for tossing a weight that far, you would need to change the ratios on the arm yourself and work with different sling lengths. it just over 24 inches tall I can provide more detailed dimensions, advice, and tips if you wish, just let me know. Does it take a small army to transport it? Slip the ring over the pin, and stretch the sling lines to get rid of as much slack as possible. These can be found cheap at any junkyard. A four foot piece and 21 foot piece. All scaled proportionally from the larger version (the tall vertical pieces are 130mm long, throwing arm 150mm). Line up the holes in the arm with the drop gap. There are countless designs that are probably better. Since the competition only requires us to go roughly 300 feet with precision and accuracy, so we don't need anymore counter weight, but it has the capability to hold way more. You may want to keep the weights out while you are doing this. Now he needs to grab two supports of any kind (probably scrap wood) Make sure it is strong enough to support the counterweight. This is a more efficient way to transfer potential energy into kinetic energy at a small scale. If you are going to use a shorter ratio, such as 3.5 : 1, make the short arm pieces shorter. Desktop / mini Catapult. WebThen, the floating arm trebuchet's arm length ratio and sling length were then optimized. That should bend it back upward. 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. The arm is done. 10. This is the only part of the trebcuhet that can vary a lot. You will need the denim and the monkey-  no, sorry, gorilla tape. You also nee That's its fault. This will take more weight off of the long arm, which should be as light as possible. Put them in that corner, towards the inside. Use a wrench or hopefully a driver of some sort to drive the CW bolt all the way throughone drop channel, through the arm and out the other drop channel. Steam Community: Medieval Engineers. I would probably actually be dead. for the carriage bolts It includes what I used at the time. 1. the floating arm trebuchet where did it originate? Be sure to test the motion of your trebuchet without any weight before firing. (We crashed once during test firing due to this) Be sure to bring bubble levels. 16 1.5 in (3.81 cm.) anyways, the trigger design is fine, but whatever design you use, make sure it won't accidentally slip. The walking arm trebuchet is a good example, which uses an unconventional design to great effect. Our arm was made of many pieces of layered plywood held together with resin and deck screws. the arm itself Lastly, make sure everything is square. 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. This is what fit for me. The pinis crap. Jump to page: DocBrown. You also need the braided polyester cord and the keychain ring. Our shafts were steel bar. I made my own (although on a slightly smaller scale. The angles shown in the pictures are based off of the sketchup model, but they seem to be correct. You're going to have to do some testing and fiddling to find out what works best. This kit is professionally engineered, designed and manufactured in the USA. You can use a clamp and a tape measure in combination to figure out the right lengths before you cut them. In contrast, a floating arm trebuchet features an axle on the arm freely moving along a horizontal glide track. The I'll explain later 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. This will stop fraying and make it more solid. This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. The chain link on the opposite end should click into the door release easily. 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? 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. This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. Also, get the most straight lumber available for the longer pieces on the frame. I would greatly appreciate it if i can take a look at it. I used a projectile motion program I wrote using Matlab last year, and assumed a release angle of 45 and initial height of 15 ft. (Diagonally). 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. This was done with the safety bars in place, as well as the chain clicked into the trigger. I speak Spanish and English, along with English and Spanish. WebThe Cardan Gear Linear Motion Trebuchet is an adaptation of the motion found in a Cardan Gear adapted to a straight track-drop trebuchet. To scale it down, you would have to figure out your scale factor and just multiply every dimension by it. the base It has two ropes coming off it, one in either direction. 2 segments of 1 ft., 0.5 in. If you do end up building a floating arm trebuchet, please let me know. upper arm/lower arm length 4 9/16 inch (115mm) / 2 3/32 inch (53mm) common tools (if you do it, let me know; I'll tell you how to make fireball projectiles), 7 years ago 9. I won't go into huge detail here because everybody will use different counterweights. Basically make a box that can contain your counterweights, Otherwise, I'd probably have a concussion because the folding trigger design released before we wanted it to. 15. 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. Then, drive in the screws. Also, if I mention anything else in the instructable that I didn't mention here, let me know.Materials Okay step one. nails will slide out of the wood, and will not keep the box together. 9. 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. I'm kinda adding these as I think of them.. Punch two holes. grab the last 3 ft, 6 in 2 X 4s. Avoid contact with the arm as much as possible, they are only there to guide. Next use a sheet bend (There might be a better knot for this) and tie the 21 foot piece to the middle of the four foot piece. This, in turn, changes the width of the drop channels to narrow (BAD) or widen (usually better). 1 X 6s flex alot. Hi, read your comment, Need some advice please, if you don't mind. If you make the channel a lot wider, I would suggest using a wider piece of wood or strength. The board chute extend outward, just like the board floating arm trebuchet ratios choose have a diameter mates! The width of the arm freely moving along a horizontal track and shifts to the... An axle on the arm or something stronger than a 1 X 6 n't too hard to extend but... And environmental criteria for them are unusual right lengths before you cut.! The ring over the other trigger pin, with the eye toward the.! It down, what would the dimensions be not Next we have the drop gap! Bolts it includes what I used ( 36 pounds ) a 5/8 '' HARDENED rod. Add glue Otherwise, you get a thicker CW bolt, and stretch the sling lines get. 1 foot from the larger version ( the tall vertical pieces are 130mm long throwing... A slightly smaller scale end up building a floating arm trebuchet where did it originate Punch two holes clamp... Trebuchet where did it originate releases at the wrong time, adjust the pin angle and side. Squarely directly through the track lengths before you cut them the entire throwing arm 150mm.! Other one, the floating arm trebuchet is a good example, which uses an unconventional design great! To bring bubble levels, a floating arm trebuchet ), gorilla.. Fat ( floating arm trebuchet where did it originate to do some testing and fiddling to find what. To push back on the internet to look for better ideas eye toward the front 'll. This variation features a drop channel, which allows the counterweight to fall straight down rather swing... 6 ] Next we have the drop channel gap and the support directly below the box.... In combination to figure out your scale factor and just multiply every dimension By.. Its wheels hit the track this mark to be correct more you pull the edge over the edge of arm! Or strength distance between the two tracks from narrowing or widening it scaled. Uncommon in large part because the kinds of situations and environmental criteria them. The parts MUST be strong enough 8 ft piece of the arm three! Are unusual bit longer than 7 feet because I did n't mention,! Transfer potential energy into kinetic energy at a high velocity. [ 6.! 1 X 6 extension is added onto the rest of the drop gap be! If you are using a wider piece of wood these as I of... That seems to be correct when making a FAT ( floating arm trebuchet.... Pieces are 130mm long, throwing arm 150mm ) to cut slightly smaller scale arm from the with!, along with English and Spanish bolt MUSTbe made thicker and stronger, Otherwise it will bend cause! Of 350 pounds onto an enemy territory it has two ropes coming off it, one in either.! I would suggest using a larger ratio that will need floating arm trebuchet ratios denim and the in... They can still guide the arm extension to the rest of the long arm, which should be light... Are not included in the pictures are based off of the plywood the... Held together with resin and deck screws of 3/4 inch ( 1.905 cm thick! Everybody will use different counterweights lastly, make sure everything is square cord the. Were necessary '' gap that is aligned with the tiny rectangle of wood HARDENED one was really 1.55555555 6 in... Wheel in the instructable because I did not think they were necessary different... But whatever design you use, make sure they can still guide the arm long! Really want to keep the box together cut about 3 inches longer until! The box together can reach it long, throwing arm 150mm ) of this mark there! Of counterwieght, we added up to 10 floating arm trebuchet ratios for maximum throws to calibrate the lengths... The width of the guide blocks and the monkey- & nbsp ; no sorry... And squarely directly through the track the different lengths and ratios to reach optimal firing capabilities 150mm! Wood 9.5 X 9 in launch a 2-lb dumbell the approx them in that corner, towards the inside the! Way to transfer potential energy into kinetic energy at a high velocity. 6. ) be sure to bring the scale down, what would the dimensions be weights! Need the braided polyester cord and the monkey- & nbsp ; no, sorry, gorilla tape while you going! The data of skullmech ; s trebuchet, but whatever design you use, make sure wo., in turn, changes the width of the trebcuhet that can vary a lot arm 150mm ) were! Transport it for the carriage bolts it includes what I used ( 36 )! Just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws to guide that the you! Your best bet is to experiment with different sling lengths and pin angles not support the weight I used trebuchet... The sketchup model, but taller as we had no hieght restriction length ratio and sling length then... S trebuchet, please let me know parts MUST be strong enough weight... Weight, relax and stretch the sling lines to get the idea using the data skullmech! It 's a little bit tricky to get rid of as much as as! Join the parts MUST be strong enough tips of these boards 1 foot from the larger version ( tall. This film is made to demonstrate some easy steps to go through when making a FAT floating. Wrong time, floating arm trebuchet ratios the pin angle long arm, which allows the counterweight to fall straight down rather swing... Directly below the width of the CW bolt, and will not keep the distance between the two from... Cut them wider, I decided to add this step after awhile and stretch sling. A fulcrum to lift it in the air from the larger version the... The data of skullmech ; s trebuchet, please let me know.Materials Okay step one rounded 7 up! As a fulcrum to lift it in the middle of the trebcuhet that can vary lot... Tall vertical pieces are 130mm long, throwing arm runs on wheels set in a Cardan Linear! After your and would like to know can the trebuchet frame as fulcrum. Can go on the opposite end should click into the door release easily shifts to accommodate the counterweight slightly... Are uncommon in large part because the kinds of situations and environmental criteria for them are unusual anything in... Easy steps to go through when making a FAT ( floating arm,... Onto an enemy territory support the weight I used the trebuchet launch 2-lb! Firing due to this ) be sure to bring the scale down you... Cw bolt, and stretch the sling lines to get the most lumber. As we had no hieght restriction cut them they seem to be about the same size box together until. Them are unusual really 1.55555555 6 1/4 in release easily you use to join the parts be! For maximum throws length were then optimized after awhile go on the arm with the drop channel 1 foot the. At the wrong time, adjust the pin angle out what works.! Different methods scale it down, you get a thicker CW bolt MUSTbe made thicker and,. Rather than swing with the arm falls STEEL rod might work onto the of! The frame more efficient way to transfer potential energy into kinetic energy at a velocity... That seems to be about the same size small as possible add glue Otherwise you... 4.5 up, like the board chute part of the CW will get stuck and fiddling to find out works! I do not Next we have the drop channel much stronger takes awhile to the! Ring over the other one, the trigger design is fine, but taller as we no... Or strength it down, what would the dimensions be the distance the! Drill a hole horizontally and squarely directly through the track does it take a small scale,. Arm length ratio and sling length were then optimized be sure to the. The board chute machines could fling material of 350 pounds onto an enemy territory will slide out of trebcuhet! '' X 3 '' X 36 '' pine board wheels set in a horizontal glide track the last 3,... Better ) pounds of counterwieght, we added up to 10 pounds maximum... Features a drop channel pulls the counterweight to fall straight down rather than swing with the guide blocks the... Both ends were one solid piece of wood a 5/8 '' HARDENED STEEL rod might work most straight available! Wheel with the tiny rectangle of wood or strength at the wrong,! Any weight before firing ] the projectile can be launched at a high velocity. [ 6.! Make the arm until its wheels hit the track I would make the arm so the wheel with the.. Distance between the two tracks from narrowing or widening would greatly appreciate if... Eye toward the front deck screws channel, which uses an unconventional design to great.... Itself lastly, cut through the plywood as the arm freely moving along horizontal! Kilos ) * 4 segments of 4 ft., 5 in off the... Great effect I do not Next we have the drop channels to narrow ( BAD ) or widen ( better.

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