Fairly simple trigger design. 9 years ago For me, this was a little more than halfway through the side pieces. It is scaled using the data of skullmech;s trebuchet, but taller as we had no hieght restriction. You can use a clamp and a tape measure in combination to figure out the right lengths before you cut them. These are the pieces of wood directly on either side of the drop channels. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. 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. Do the same with the bottom of the board, the part that you held against the bending brace. It would be better if both ends were one solid piece of wood. This kit is professionally engineered, designed and manufactured in the USA. Then, we cleared away and removed the safety bars, and fired. 1. This list of materials is copied directly from my science fair project. It includes what I used at the time. The lumber list is really long, but That's its fault. I'll write more about this in the improvements step. Now, cut very carefully and very straightly down the lines you made. When the beam has cured, trim off any excess wood to make planar surfaces, and sand off the excess resin. You're going to have to do some testing and fiddling to find out what works best. Share it with us! Use a washer wherever metal is coming in contact with wood. This would, however, change the lengths of the diagonal supports. Use your head before you lose your head. FDM 3D Printing; SLA 3D Printing; 3.5+1 represents the total length (Short plus long arm). To do this, I stood the arm vertically on the ground, then climbed to the top of a ladder with a mallet. Ok, looking at the main pictures, there are two more big things that need to be added to the mainframe. Drive 2 screws through the drop channels and into the supports. 2 hand weights, 10 lbs (4.54 kilos)* Scribe the line all the way down the length of the board. (Forward to the direction of motion makes it release later, backwards= release sooner. The Floating Arm Trebuchet. Drill a 1/4 hole 20" from one end, in the middle of the board, as shown in Fig. Use a forstner bit or any other drill bit and drill holes parallel to the length of the long 1 X 6 and near the inside corner. 6. The bottom is the side where the 2 ft 1 X 6 overlaps the long 1 X 6. I keep them in one of the mitered side support screw holes so I can easily reach them once I get the CW to the top. A solid metal ring of any kind would work better. -----------(pouch)----------- One end is tied through a hole that's drilled in the end of the arm. (Hopefully your friends haven't deserted you over this trebuchet obsession. In larger designs, the trigger system is applied at the top of the drop channel. Oh man that is awesome. Hey Chans2901, Thanks for your questions, I love trebuchets! Ask Question Comment Download This one is pretty bad. *A few notes: the angles were based off of the sketchup model which had a few errors. 3 ft. (0.9144 m.) long 5/8 in. um.. Make sure they are placed correctly, and make them as square as possible to the base. Thanks for the great instructable! 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. Just as a reminderremember to add glue The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. They would at the very least be a good guideline. Keep the hole in between the main track supports and the diagonal track supports. The main problems would be the extra weight needed to really make the 6 pound weight fly, which would put extra strain on the wheels on the arm and the bolt holding them, the counterweight bolt, the counterweight boxes, the sling, the sling lines and the trigger assembly. The floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. At least i think. for the threaded rod The placement of these pieces is shown in the sixth picture. 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. A friend and I are making trebuchet that seems to be about the same size. 10 1/4 in. Tie it so that it hangs about 12 inches (2.55.1 cm) from the top of the arm. Reply Add the two numbers of your ratio together. 7 years ago It cost me about $130 not including the weights. 2 segments of 2 ft. (0.6096 m.) long 5/8 in. After going through much analytical geometry, etc., etc., Then bolt on the wheels. WebFloating Arm Trebuchet - Hobbyist Version The F.A.T. The two previous segments are diagonal supports. Look at the pictures for alignment. (1.8796 m) long 2 X 4 [2] The eye bolts are usually placed at the bottom of the frame, locking above the arm to prevent accidental release. 3 ft. (0.9144 m.) long 5/8 in. (Should be square to the length of the board, like a crosscut.) 6 segments of 2 ft., 5 in. anyways That should be about 2 inches from the end of the track. You should have a " Y " shape rope with a trigger pin on each end. I simply layed a fairly long board over the diagonal supports in the back, extending out a bit to give support to the sling until it was lifted up into the air. Different jeans vary, so this next step might be different for you. on Step 15. 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. The first 5 pictures (except the first and second) specifically show the dimensions for the "long" side. Alternatively, you can attach a heavy weight such as a 20 pounds (9.1 kg) hand weight directly to the end of the arm. While this is happening, the wheel is moved backwards by the torque acting on the arm from the counterweight. Main track supports [5], A floating arm trebuchet has three points of contact where friction can interfere with efficiency. 2. It should be drilled all the way through the flatter 3.5 inch edge side. 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. This is a more efficient way to transfer potential Fun Crafts For Kids Craft Stick Crafts Wood Crafts A few things to keep in mind are the optimum ratio for the arm length (2:1) , or L=3P in the schematic diagram. (Note: rope angle of 45 is different than arm angle of 90-105) Nylon rope held fine, but it stretched every time we fired, making fine-tuning tough. "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. Lower it below the base, just rest it on the floor. Take off the drop channels completely so you can cut through here. Did you make this project? Line up one edge of the bottom of the track with the 2.5 foot mark. I'd look around on YouTube and compare different sizes of trebuchets. It would also bend out of position because of the force of the swinging projectile. 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. There should be two layers at the outside and 1 layer inside, in the middle. Center the wheel in the middle of the guide blocks and the wheel with the guide blocks in the middle of the tracks. Mark this height. *I want a 3.5:1 ratio. In this high-efficiency design, the counterweight is constrained by a track to fall straight down. I'm still working on the "improvements" page but everything I was going to mention on it was kind of already mentioned throughout the instructable. ), but I came up with distances reasonably close to the actual performance. 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. I'd maybe assume 50% efficiency as a conservative estimate for the f2k (it's probably higher), so the initial kinetic energy of the projectile is equal to the gravitational potential energy of the falling counterweight times the efficiency. About: Mechanical Engineer in the machine design industry. [7] A projectile is loaded into a sling at the end of the throwing arm. The first sketchup picture (Sorry only have real pictures of the finished thing) shows what it should look like when your done. Leave a comment!!! To get it in, you need some sort of head on it for the wrench. Lastly, with everything aligned, clamp them together in the stack and let dry. Socket wrench for your threaded rod Now, I believe that the width between the bottom of the main track supports is somewhere around 1 ft, 1 inch. You should also cut off the head if you keep getting downward throws no matter how you adjust it. Question 8. upper arm/lower arm length 4 9/16 inch (115mm) / 2 3/32 inch (53mm) 6 Attach the sling pouch to the arm. Circuits | Floating Arm Trebuchet : 7 Steps (with Pictures) - Instructables 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. This is way too cool. 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 WebFloating Arm Trebuchet. 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. Again, cutting these pieces shorter will narrow the track and cutting them longer will widen it. Drill a hole somewhere near the end of the armit doesn't matter, but it should be at least 3/4" from any edge. Trebuchet. A regular trebuchet is a better realistic war machine. attach an appropriate length of 1900lb test chain. Make sure there is glue all over them. Slide the bolt through one hole, screw everything on in this order: On this Wikipedia the language links are at the top of the page across from the article title. Before we start, there were a few problems. It does not matter. You also might want to improve the pin system-at least make sure your pin is smooth. WebThe floating arm trebuchet is a modern take on an ancient war machine. 4 segments of 4 ft., 5 in. Thanks for writing this 'ible. Follow the measurements given of the depth and width of the cut. Remember to shorten the short arm pieces if you are using a larger ratio that will need to make it shorter. 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. Basically, THE CW BOLT MUST BE MADE STRONGER!! Lastly, drill a hole through both the walls of each box at least two inches from the top edge for the counterweight bolt. 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) It has two ropes coming off it, one in either direction. these will be used in the trigger I want a 3.5:1 ratio and 7 ft long total beam. 2 segments of 2 ft., 11 in. ), Reply First, you need to know where you will screw in the bottom of the main track supports. 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. You also will need to push them out slightly, so that the gap is 3/4" at least. Double- check everything. 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. The pin is made of all thread, 1 ft long, with the threads on the end ground off. Now comes the fun part. Ok, now, the base is constructed using half- lap joinery. X 3.5 in. 5. Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. When you look at the picture, they are the big, tal 2 segments of 6 ft. (1.8288 m) long 1 X 6 Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) Lastly, cut through the plywood rectangle so the wheel does not bump over the edge of the plywood as the arm falls. DRILL PILOT HOLES FOR EVERYTHING!!!!!! You can cut the gap wider up to a certain pint, but the trigger design might limit the amount you can cut it wider. ALSO, the base boards (I used 1 X 6) should be thickened. 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. 4 rectangles of 3/4 inch (1.905 cm) thick wood 9 X 4 in. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. Luckily we caught it and injuries were avoided. We built a 1/3 scale model that throws a 1 pound projectiles 340 feet + with 70 pounds of counterweight. You also need the braided polyester cord and the keychain ring. It launches 5 pound pumpkins around 320 feet with 250 pounds of counter weight. Quickly, before the other guy gets sore holding the arm, the person on the trebuchet will need to slide some scrap 2 X 4s around a foot long over the gap in the track. 23. denim fabric Hi, I looked it up, and for floating arm trebuchets the weight-projectile ratio tends to be about 1:50. The chain link on the opposite end should click into the door release easily. Okay now you need to cut the axle. it would be much appreciated!! 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. *must be able to fit inside counterweight boxesSling To cut the tracks, mark a 3/4" gap that is aligned with the drop channel gap and the support directly below. 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. Cut at least 3 inches longer unless you are very good at cutting angles accurately (A miter saw would help)\ If you have a router, it would be easier to do this by just cutting away the material. .and several of the bolts for the 5/8" threaded rod. It may have thrown some little thing off so just use your judgment about the angles. Keep in mind that the rails should be unobstructed, and the gap where the weight bar will go should be small enough that your wheels can easily glide over it. 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. (1.5875 cm.) If you make the channel a lot wider, I would suggest using a wider piece of wood or strength. It was an old rusty double- headed nail. With the help of the Siano paper we were able to engineer a very effective machine. Arm-sling constraint, arm roller on fixed track, projectile above ramp. 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. (6.35 cm.) We spent around $300 in lumber and concrete, and several hundred dollars more on metal shafts, plates, etc. I'm kinda adding these as I think of them.. I think that's it thank you, Reply That model was equipped with a folding gantry and pulley system to raise the counterweight, with that it could be fired every 2 minutes. Remember you need to make two of these. Now I'll tell you how to lock load and FIRE! 2 1/2 X 10 eye bolts You can always add on later, but it's easier to get a long enough one in the beginning-before you glue everything together. Use three screws in every place that the diagonal touches the track or support. I speak Spanish and English, along with English and Spanish. Onto one end of the rod screw on a bolt, washer, and another bolt in that order. For me, for the side with the longer support, this was about 5 ft, 7 inches from the very bottom of the drop channel.
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