I would love to see it while being constructed and finished. look out for flying cats Push one of the corners of the diagonal support next to the bending brace, but keep it one the base. Trebuchet. It worked fine for me, though. 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. Whenever you feel like it, slip in the other trigger pin, with the eye toward the front. It was determined that the optimal arm length ratio was approximately 1:2, where the short But make sure you go to the website for wheels that I recommended in the Instructable to avoid paying too much for wheels. The Floating Arm Trebuchet The trebuchet is a medieval gravity powered engine of siege warfare designed to hurl a projectile, such as a heavy stone or a diseased animal, at a distant target such as castles. Now, measure that same distance on the base. Reply The base is finished. Thorsen said: boohbah said: unfortunately lordbob is no longer with us , he suffered a fatal blow to the temple from a golf ball. 7. Make sure the gap is aligned with the supports and the gap in the drop channels. Trebuchets work by using a counterweight system turning the falling energy of the back end into a high speed launch of a heavy S Kei Sco Table Saw Sled Marble Machine Plan Drawing All The Way Down Viera Stick It Out Things That Bounce Element 1. 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. It is scaled using the data of skullmech;s trebuchet, but taller as we had no hieght restriction. Center the bolt in the arm, with the same length of bolt coming out from either side. These should be fairly simple-they're just diagonal pieces. As a starting point, cut these two 8. Floating arm trebuchet (dimes and pennies) Desktop Trebuchet. So bad. Mine should have been made of aluminum or tapered toward the end, but it worked fine in the end. 1. 7. 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. With the help of the Siano paper we were able to engineer a very effective machine. Remember the length really is only 1 ft 5 in. FIRST PROBLEM The hardest part, really, is getting the angles correct and then cutting them accurately. Then, measure 3/8" from either side of this mark. 3. This list of materials is copied directly from my science fair project. Here are some stats, note that these apply to the original #2 treb. wood screws, phillips head drive, #8 (See the last photo if this is confusing) When loaded, your projectile should sit directly between or slightly behind the upright beams. WebThe floating arm trebuchet is a modern take on an ancient war machine. 10 years ago A traditional trebuchet, which is simple to engineer, consists of an arm resting off-centre on an axle with a hinged counterweight at the short end of the arm. (1.3462 m) long 2 X 4 I've made the pouch and strung one side through but from then on I'm lost. To begin, enter the parameters of your trebuchet in Center it; make sure the same length of bolt is protruding from either side. Does anyone have a solid works file for this trebuchet? As I said before, the longer diagonal support will be on the side of the drop channel that is farther away from the end of the tracks. As long as it's a strong, flexible cloth pouch that is big enough to wrap around your projectile, It's fine. Short arm, washer, bolt, washer, wheels and bearings, washer, bolt. 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. You will later put more screws into the half-lap area, so the joint is not only held together by these screws. (15.24 cm.) Remember to shorten the short arm pieces if you are using a larger ratio that will need to make it shorter. Tighten all the knots and make sure none will slip. Use a bowline knot. on Introduction. Parallel to the seams, cut all the way through so that you can open it into one sheet. 20 yell heads up, countdown , just make sure everyone know you are firing. Luckily we caught it and injuries were avoided. 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. it just over 24 inches tall I can provide more detailed dimensions, advice, and tips if you wish, just let me know. y Test 3: When the trigger is released and with the arm slightly how long was the arm after the extension? War Wolf was the largest trebuchet ever made and was rumored to send boulders of about 150 kilograms across a distance of over 200 meters. The CW bolt MUSTbe made thicker and stronger, otherwise it will bend and cause problems. ) First, pick one end of the trebuchet to be the back. First, obviously, just lay the arm in between the drop channels (Just the middle of the treb) That should bend it back upward. 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. Don't judge me) 4 rectangles of 3/4 inch (1.905 cm) thick wood 9.5 X 9 in. A four foot piece and 21 foot piece. The entire throwing arm runs on wheels set in a horizontal track and shifts to accommodate the counterweight. for the sling 3/8 X 4 eye bolt (Including bolts) Punch two holes. I made my own (although on a slightly smaller scale. I like things that go boom and sushi, preferably at the same time. In this high-efficiency design, the counterweight is constrained by a track to fall straight down. To get it in, you need some sort of head on it for the wrench. Just in case you didn't know erm 17. (0.4318 m) long 2 X 6 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! 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 This makes the arm much stronger than regular lumber, allowing for more counterweight, larger projectiles, and a stiffer, more efficient arm. (8TH picture) Then tape them in place. Heavier projectile= earlier, lighter projectile = later. ) About: Mechanical Engineer in the machine design industry. The cutouts go around the main track supports. The ridges would sometimes catch on the heads and sometimes not. The third clip in the video shows this problem well- the arm kind of rolled over and on top of the guide blocks because they were too high. I just posted an instructible of our own design, it's a lot beefier, we threw 10-15 lb pumpkins around 300ft, and we actually got 720 lbs in counterweight on it, not including the weight bar or short arm. Tools your best bet is to experiment with different sling lengths and pin angles. You want to keep the width relatively narrow, but wide enough to accommodate whatever projectiles you plan to use. Grab your nylon rope and cut 4 feet off the end. Socket wrench for your threaded rod 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? Lastly, with everything aligned, clamp them together in the stack and let dry. extra lateral support (0.635 cm) diameter, 6 in. 5. 1 segment of 7 ft. long 2 X 4 8 years ago (0.2413 X 0.2286m) This is essential for an efficient machine. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. So we built a 10 throwing arm trebuchet. The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. will this still work that small? The second length of rope is tied to a small ring- like a loose keychain ring. with that. Tie it so that it hangs about 12 inches (2.55.1 cm) from the top of the arm. 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. 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. 6. (Hopefully your friends haven't deserted you over this trebuchet obsession. Reducing the drop distance of the wheel axle to the glide track would reduce damage, but also reduce the range of the trebuchet. 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. (Look at the picture) It's 12 feet tall with a 10 foot arm. Remember the bumping problem. 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. Mortise and tenon joints here would be best, but I didn't feel like they were necessary. Platform is pine. Really, you just want something to support your sling during the first part of the arm's swinging so the sling is not dragging on the rough ground. The trigger pins keep the weight from falling. Your arm should look nice and smooth like the pics. then divide your total beam length by that number. We built a 1/3 scale model that throws a 1 pound projectiles 340 feet + with 70 pounds of counterweight. Threee previous sections are for the counterweight boxes. 7 years ago Allow about 1 week before firing your trebuchet. Reply Because we are about to cut the tracks in half. You also might want to improve the pin system-at least make sure your pin is smooth. Ask Question Comment Download it's smoother, faster, and prevents grooves from wearing in the wood. This is only to coutersink the screws, do not drill the hole all the way through. Well, they didn't becasue I did not have a drill press. we didn't use a simulator for the motion. Position them in between the two main track supports and trace a line as best as you can along where they overlap; this is where you will cut the half-lap. 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. 19. 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 Now we're finally going to add the last few lateral supports and the guide wheel. Use your head before you lose your head Next we have the drop channel supports. 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. (0.7112 m) long 2 X 4 Make sure there is glue all over them. 16 1.5 in (3.81 cm.) Then, use the sander to sand it down flat and smooth. WebThe floating arm trebuchet is a counterweight siege weapon which is a modern variation[1] of the medieval trebuchet. Shims may be needed to level out the device. 9 years ago We think that the downward throws were caused by these two heads. Just cut a length of 2 X 4 To fit in the spots shown in the pictures. This variation features a drop channel, which allows the counterweight to fall straight down rather than thick wood, 2 ft., 5 in. The more you pull the edge over the other one, the deeper the pouch will be. You need to lift the counterweight to the height of the supports so your friend can get them just underneath the CW bar. The two previous segments are diagonal supports. on Introduction, On the working model simulator how do you make the sling release at 45 degree, Reply ), but I came up with distances reasonably close to the actual performance. 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? 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 will differentiate depending on your ratio. FDM 3D Printing; SLA 3D Printing; Drive 3 screws through the track and into the supports, then three more through the base and into the supports. 6. 3 3 in. 6 1/4 in. And, I'm not looking to chuck this 200yds. They should be about 2.5 feet tall. 4. I would get more in case some of their heads strip I don't remember the exact dimensions, but I think it was a little bit taller than 8 feet, and about 6 feet long. If you want a better pin system, look at the turnbuckle pin system here. 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