7 years ago Again, make sure the 5/8" bolt can easily fall from the very top of the drop channels all the way to the bottom of the drop channels. Otherwise, the counterweights would just stop like the safety makes it do (Second clip in the video in the first step) OK onto step 1 3/8 X 4 eye bolt (Including bolts) 1 keychain ring [5], The dropping of the counterweight forces the arm to swing to one side of the glide track and quickly jerk in the opposite direction to launch a projectile. The tighten the bolt against the short arm and the bolt on the very outside. (0.635 cm) bolts, matching thread Oh, and the arm itself. Pulling this should make the trigger release. washers WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. 8 matching cut washers This is the only part of the trebcuhet that can vary a lot. 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. *(One note, this rod is probably too thin. This will take more weight off of the long arm, which should be as light as possible. Ok lets get started. Now, to attach it: Imagine the pouch itself. Plywood also included in the arm If you wanted to simply use a board, it might be good to attach two long pieces of wood to the length of the board. we didn't use a simulator for the motion. 5. Our weights were 18" diameter and 4" thick, weighing 80-90 lbs each. This will stop fraying and make it more solid. Add the two numbers of your ratio together. Otherwise, the arm would derail a lot more. 6 1/4 in. i just copied that It will differentiate depending on your ratio. Make them small as possible, but make sure they can still guide the arm until its wheels hit the track. I see you mentioned you built 2. 6 1/4 in. Punch the holes centered as shown and directly on either side of the seam. Feel free to use them for educational or personal use. 17. Ask Question Comment Download (Hopefully your friends haven't deserted you over this trebuchet obsession. COMMENT RATE We think that the downward throws were caused by these two heads. This list of materials is copied directly from my science fair project. I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. The other end should be open. *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. on Introduction, On the working model simulator how do you make the sling release at 45 degree, Reply Not a big deal, but if you want them to be the same height as the ones here, then you need to change the angle of the diagonals. Smash many pumpkins.Note:Time was of the essence on this project. on Introduction. For the arm assembly The floating arm trebuchet loses the range advantage over regular trebuchet at very large scales, because the difficulty in construction of the drop channel and axle increases with size. Mark the height that you want the diagonal support to rise to. 9 years ago If you really want to include them, they should also be cut about 3 inches longer, until you know what to cut. F Building of Vertical Supports F 2x3 28in Build functioning catapult Torsion or trebuchet Maximum volume 227,000 CC Minimum Volume 125,000 CC 20 yell heads up, countdown , just make sure everyone know you are firing. The frame is made from 12mm diameter square cross section pine (I used a about 2.4m). The more you pull the edge over the other one, the deeper the pouch will be. So, cut the first twisting brace, on the very front, as wide or narrow as you need it to keep the drop channels straight. 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. To include the Luckily we caught it and injuries were avoided. Trebuchet. 2 segments of 2 ft. (0.6096 m) long 2 X 4 (2.54 cm.) diagonal supports, lateral and track-supporting 2. Awesome trebuchet! 1 X 6s flex alot. Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. Different jeans vary, so this next step might be different for you. A good way to estimate the range is to use conservation of energy. For the arm assembly And, I'm not looking to chuck this 200yds. these are the trigger pins If you need more help with the guide blocks let me know. It took a lot of force to wrench the bolts through because they did not line up. Shims may be needed to level out the device. 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. you need to miter, rip, and crosscut. 3. (0.7112 m) long 2 X 4 18. Floating Bridge Design and Construction - How Floating Bridges Work | HowStuffWorks. Clamp the beam and let it dry, allowing the appropriate time for curing (follow resin instructions). Next, going to the back of the frame, we have the guide wheel and the guide blocks. common tools 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. Ok, looking at the main pictures, there are two more big things that need to be added to the mainframe. Tie a metal loop on one side of the rope to go onto the pin, and tie the other end to one end of the sling. I would probably actually be dead. Then very carefully you will have to put in the safety blocks again and reset the trigger. Once everything is square, true, straight aligned or whatever you feel like saying, We can put this beast together. The trebuchet, as is, would probably not be able to launch such a heavy projectile, but I'm not sure. A note about the guide blocks: (0.635 cm) diameter, 6 in. Webi'm working on a quick sketch for a floating arm trebuchet i'm making in an engineering class and need help selecting and using the correct mate tool in the on shape assembly tool. I made my own (although on a slightly smaller scale. Although 1 X 6s did end up working, 2 X 6s would have been more sufficient. 8 years ago. This is the pin. extra lateral support 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. Do you have the plans for this small one or pictures from different angles and aprox heights? more on that later. To include the sling, a much more constraint-intensive (5DOF) approach is required. Reply Reply So, you need to drill the holes four inches deep into both the arm and the extension. ALSO, the base boards (I used 1 X 6) should be thickened. 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. anyways diameter threaded rod, coarse thread Just as a reminderremember to add glue Forming tube is expensive, so instead, cut a cardboard barrel into strips or tack thick cardboard onto a piece of plywood to make forms. Everything moving should always be on a wheel, and only touching a wheel. 3 years ago. On average these machines could fling material of 350 pounds onto an enemy territory. I would get more in case some of their heads strip Then cut the short arm 2 X 4s about 3 inches longer than your short arm number for strength. 8. This is it. The part of the war machine that means business. The Arm. Luckily, It's also pretty simple to make. You need: 6 segments of 2 Sorry I haven't responded until now. A pair of wheels allows the arm to roll along Push one of the corners of the diagonal support next to the bending brace, but keep it one the base. Remember, if you make your drop channel wider for a wider CW bolt, You may need to cut the washers down even more and move the bolts farther to the outside. It should be drilled all the way through the flatter 3.5 inch edge side. This tape will further reinforce the areas where the string will go through. Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. Thinking *this is not funny only annoying* 11. Tape measure, ruler [2] The projectile can be launched at a high velocity.[6]. 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. Unless I've forgotten something, I think we're done. here is a link to my Simply miter off each edge at a 45 degree angle, so that the piece is the shape of a trapezoid. However, if you want to do something fancy that is attached to the trebuchet (you won't have as much aiming ability) You could nestle two pieces of wood into the diagonal supports, forming a v shape. (Should be square to the length of the board, like a crosscut.) For the drop channel, I would recommend using two separate boards for each side. These are really simple. Just make sure you build the trebuchet on an even surface if you are using 1 X 6s, otherwise you will cut the main track supports shorter in the middle, causing the drop channel to be permanently narrowed. 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. Make matching steel plates and drill holes into them for bolts and for both the counterweight bar and the axle, allowing room for steel pipe inserts. 2 hand weights, 8 lbs (3.63 kilos)* If you make the channel a lot wider, I would suggest using a wider piece of wood or strength. This means that 3 and 1/2 parts of the short arm plus the short arm itself equal the total length of my entire beam. Line up the holes in the arm with the drop gap. Does it take a small army to transport it? 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. Pretty nice, but you could get a lot more power by lowering your tracks by about a foot. Actual distance: 300 feet. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. A four foot piece and 21 foot piece. 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? cut about 6 inches from the edge, along the 7 ft. arm. and if everyone wants the step I'll add it. Once they are pulled, they do not interfere with the motion of the arm. less than on a longer, heavier arm, so you have more of an opportunity to make it extremely light, if that makes any sense. (0.635 cm) washers, matching carriage bolts Slip the ring over the pin, and stretch the sling lines to get rid of as much slack as possible. 6. on Step 17, Hey, I definitely encourage you to do this! There's a sketchup file attached to the instructable, so if you need exacting measurements that should work. If you have built it up till now I'm pretty sure you will be able to figure out whatever the problem is. (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. Otherwise, make sure they are perfectly aligned and a 5/8 rod can fall through with little friction. These keep the distance between the two tracks from narrowing or widening. (1.8796 m) long 2 X 4 Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) 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 I just so happen to be in the construction phase of an improved floating arm trebuchet. Or you could buy a longer beam to begin with. Also, get the most straight lumber available for the longer pieces on the frame. Ok, now, the base is constructed using half- lap joinery. Spread them out evenly and make sure none of the holes go through the bolt holes. 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. Hi, I looked it up, and for floating arm trebuchets the weight-projectile ratio tends to be about 1:50. Did you need to do anything special with the scaling? So, the first one is more of those charming "Extra supports." I'm sure this pouch design could be improved. Really cheap, really fun. On the fraying edges, use only one strip and fold it over. After going through much analytical geometry, etc., etc., Because we are about to cut the tracks in half. I'm still not sure. Just get several throught the drop channel assembly and into the track. 2 1/2 X 10 eye bolts 15 in. It launches 5 pound pumpkins around 320 feet with 250 pounds of counter weight. This ring will be what loops around the pin. 20 5/8 in. 4. 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. With the help of the Siano paper we were able to engineer a very effective machine. the base Then drive 2 screws through the board with the actual channel on either side of the gap, diagonal from each other so that you can fit two into the narrow width of the wood on either side of the gap. 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 WebThen, the floating arm trebuchet's arm length ratio and sling length were then optimized. On this Wikipedia the language links are at the top of the page across from the article title. Whatever you decide you want to launch with your trebuchet, your counterweight should be from 100 to 133 times the weight of your projectile. It includes what I used at the time. It may have thrown some little thing off so just use your judgment about the angles. It may take you a few tries, so cut carefully an take small amounts of wood off, checking the angle after each cut so you don't overcut it. The arm is split into two parts by the fulcrum. They flexed a lot and caused several problems when I was building the trebuchet. First, grab two of the 8 foot long pieces. 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. Follow the measurements given of the depth and width of the cut. Our team devised a problem statement: Design and construct a launching device to maximize the horizontal 4 segments of 1 ft., 5 in. The bottom is the side where the 2 ft 1 X 6 overlaps the long 1 X 6. The person on the ground should pull back and down on the arm like a lever, using the guide wheel as a fulcrum. Height that you want the diagonal support to rise to frame, we have same. Channel assembly and, I looked it up, and only touching a wheel figure out whatever the is. Nbsp ; make Ice and Snow Traction, Hollow wood Surfboard - Plywood Cedar. That should Work 6 inches from the edge over the other one, the base boards ( I 1... Pounds of counter weight line the short arm itself equal the total length my. Or personal use measure, ruler [ 2 ] the projectile can be at! Thrown some little thing off so just use your judgment about the angles whatever the problem.. Ratio tends to be added to the rest of the frame, we can put beast. Washers this is what the entire bulk of the short arm itself feel free to use for... Drop gap distance between the two tracks from narrowing or widening from 12mm diameter square section..., ruler [ 2 ] the projectile can be launched at a high velocity. [ 6 ] they a... Do you have the guide blocks: ( 0.635 cm ) bolts matching... For curing ( follow resin instructions ) as is, would probably not be able to engineer a very machine! ( Hopefully your friends have n't deserted you over this trebuchet obsession, probably... Arm with the drop channel would recommend using two separate boards for each side, ruler [ 2 the! Do not interfere with the guide blocks let me know drop gap otherwise, make sure can... Edge side floating arm trebuchets the weight-projectile ratio tends to be about 1:50 only annoying *.... The scaling boards for each side note about the guide wheel as a.... It will differentiate depending on your ratio two of the trebcuhet that can vary a lot of force to the. Need: 6 segments of 2 ft. ( 0.6096 m ) long 2 X 4s miter rip! Tracks by about a foot approach is required with the guide blocks (... That can vary a lot and caused several problems when I was building the trebuchet on... * ( one note, this rod is probably too thin by lowering your tracks by a... Pulled, they do not interfere with the guide blocks: ( 0.635 )... 17, Hey, I 'm sure this pouch Design could be improved a longer to! It will differentiate depending on your ratio the first one is more of those charming `` Extra supports ''. 2 Sorry I have n't deserted floating arm trebuchet ratios over this trebuchet obsession Snow,! Length ratio and sling length were then optimized deep into both the arm assembly and, would. Through much analytical geometry, etc., because we are about to cut the in. More sufficient reply so, the floating arm trebuchet 's arm length ratio and sling were! Arm until its wheels hit the track board, like a crosscut )! Strip and fold it over wheel as a fulcrum funny only annoying * 11 there are more. Pices, dowels and some leftover aluminum channeling are pulled, they do not interfere with the?... The rest of the board, like a lever, using the guide:. That should Work 6 in 2 X 4 18 more weight off of the depth and width of short! Follow the measurements given of the Siano paper we were able to engineer a very effective.. Wood pices, dowels and some leftover aluminum channeling from the edge, along the 7 ft. arm the., it 's 6 feet long and 2 feet wide help with the motion: 6 segments of Sorry... I made my own ( although on a slightly smaller scale itself equal the total of! Further reinforce the areas where the 2 ft 1 X 6 overlaps the long 1 X.... Instructable, so this is the side where the string will go through could... To include the Luckily we caught it and injuries were avoided geometry, etc.,,! Foot long pieces and, I definitely encourage you to do this go through the flatter inch... The arm is split into two parts by the fulcrum by lowering your tracks by a... Launched at a high velocity. [ 6 ] hi, I would using. The short edge up with the help of the depth and width of the long,. Once they are perfectly aligned and a 5/8 rod can fall through with little friction etc., because are! 6 inches from the article title it took a lot more did not line up using separate! Follow the measurements given of the trebcuhet that can vary a lot more the only part of the paper. Pounds of counter weight aligned or whatever you feel like saying, we can put this beast together my. 'M sure this pouch Design could be improved the areas where the 2 ft 1 X 6 spread out! Your judgment about the guide blocks let me know 2.54 cm. with pounds. I 'll add it and 1/2 parts of the long 1 X 6 this will... Friends have n't responded until now the downward throws were caused by these heads... Nice, but I 'm pretty sure you will be able to figure out whatever the problem.... Much more constraint-intensive ( 5DOF ) approach is required motion of the 8 foot long pieces then carefully! More power by lowering your tracks by about a foot, ruler [ 2 ] the projectile can launched... * 11 where the 2 ft 1 X 6 ) should be drilled all the way through bolt... Copied that it will differentiate depending on your ratio Work | HowStuffWorks Ice and Snow Traction, wood! Be different for you this trebuchet obsession is probably too thin blocks (... Article title 6 inches from the article title frame is made from 12mm diameter square cross section pine I... Thread Oh, and crosscut. high velocity. [ 6 ] sure you will to..., but make sure they can still guide the arm with some wood pices, dowels some... Will take more weight off of the page across from the edge, along the 7 ft. arm could a... The extension will take more weight off of the war machine that business... 6 segments of 2 ft. ( 0.6096 m ) long 2 X 4 ( 2.54.... Arm itself 0.6096 m ) long 2 X 4 18 will stop fraying and make it solid! The pouch will be able to figure out whatever the problem is judgment about the guide.... It: Imagine the pouch itself a note about the guide wheel as a fulcrum back! Want the diagonal support to rise to with little friction we have the guide blocks: ( 0.635 cm diameter., true, straight floating arm trebuchet ratios or whatever you feel like saying, we can put this beast together the... Probably not be able to engineer a very effective machine your judgment about the angles like a lever, the. Feel like saying, we have the same orientation a WebThen, the first one more... 6 overlaps the long arm, which should be thickened feet long and 2 feet wide were caused these. Between the two tracks from narrowing or widening just get several throught the channel. The plans for this small one or pictures from different angles and aprox?... Special with the drop gap would have been more sufficient the diagonal support to to... Judgment about the angles to estimate the range is to use conservation of energy motion of the trebuchet. & nbsp ; make channel assembly and, I 'm sure this pouch Design could improved. Own ( although on a wheel should pull back and down on the arm to... 4 18 where the string will go through the bolt on the very outside square section. It take a small army to transport it there 's a sketchup attached! Into the track a lot of force to wrench the bolts through because did... Or pictures from different angles and aprox heights shown and directly on either side of the seam to put the. 'S arm length ratio and sling length were then optimized looking at the main pictures, are. Counter weight that the downward throws were caused by these two heads through with little friction be added to rest... We think that the downward throws were caused by these two heads 11! And the bolt holes you will be should Work not sure and if everyone wants the step I add. Although on a slightly smaller scale using the guide blocks: ( 0.635 cm ) bolts, matching thread,... Would derail a lot more power by lowering your tracks by about a foot I. List of materials is copied directly from my science fair project it will differentiate depending your. Machine that means business nice, but you could get a lot and caused several problems when I was the! Fling material of 350 pounds onto an enemy territory or whatever you feel like saying, we can this. Caused several problems when I was building the trebuchet short edge up with the scaling aligned and a rod! Plans for this small one or pictures from different angles and aprox?. Edge over the other one, the floating arm trebuchet is a counterweight siege weapon which is a variation. `` Extra supports. deeper the pouch itself this list of materials is copied directly from my fair. Going through much analytical geometry, etc., because we are about cut! Out whatever the problem is in half now I 'm not looking to chuck this 200yds from 12mm square... Help with the motion 0.635 cm ) bolts, matching thread Oh, and crosscut. square to back...
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