floating arm trebuchet ratiosfloating arm trebuchet ratios

Remember you need to make two of these. (0.7112 m) long 2 X 4 These machines are just as dangerous as guns. But I'm sure you'll get the idea. I'm kinda adding these as I think of them.. Trebuchet 3: An Improved Floating Arm Trebuchet. 6 1/4 in. this number is your short arm length in feet(If you kept everything in feet) Posts : 9,606. The pouch also isn't the best. The Cardan gear was invented to accept linear motion from a steam piston to create circular motion. Fill the bucket with rocks or heavy pieces of metal. 2 rectangles of 3/4 inch (1.905 cm) thick wood, 1.5 in. Clamp the beam and let it dry, allowing the appropriate time for curing (follow resin instructions). 3/8 X 4 eye bolt (Including bolts) The lines shown in the 9th picture show 2.5 feet. You may want to keep the weights out while you are doing this. Simulator. 9. I won't go into huge detail here because everybody will use different counterweights. Basically make a box that can contain your counterweights, Ideally, you would drill pilot holes for three screws to avoid cracking the wood. (1.5875 cm.) 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. 50 ft. (15.34 m) of 3/16 (0.47625 cm) braided polyester cord It will differentiate depending on your ratio. Arm-sling constraint, arm on fixed roller, projectile on ramp. Find the center of the board. 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. Still, I would make it a bit thicker. Their defining feature is free movement of an axle on the throwing arm,[2] and a linear drop channel for the counterweight. I would get more in case some of their heads strip Forming tube is expensive, so instead, cut a cardboard barrel into strips or tack thick cardboard onto a piece of plywood to make forms. We are building one now, it has been lots of fun for the family. Awesome! The walking arm trebuchet is a good example, which uses an unconventional design to great effect. Lastly, with everything aligned, clamp them together in the stack and let dry. Upon releasing the trigger, the counterweight is allowed to drop through the channel. Axel for the masses is coathanger wire but ensure the axel never absobs the full impact of the falling masses as it will bend. You will need the denim and the monkey- no, sorry, gorilla tape. This ring will be what loops around the pin. Cut at least 3 inches longer unless you are very good at cutting angles accurately (A miter saw would help)\ 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. 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. (third picture on the right) RLT industries trebuchet.com Make the arm from the 1/2" x 3" x 36" pine board. With the help of the Siano paper we were able to engineer a very effective machine. Ok lets get started. Get everyone away from the back and front of the trebuchet. Right now, I'm trying 3/4", but I'm still fixing the trebuchet and haven't tested it yet. 5 years ago. (0.3175 m) long 2 X 4 Whatever you decide you want to launch with your trebuchet, your counterweight should be from 100 to 133 times the weight of your projectile. [2] This pulls the counterweight upwards slightly after a launch. Keep everything tight. The floating arm trebuchet is a counterweight siege weapon which is a modern variation of the medieval trebuchet. To get it in, you need some sort of head on it for the wrench. A friend and I are making trebuchet that seems to be about the same size. The arm extension is added onto the rest of the arm with three different methods. Our shafts were steel bar. Beside the arm when it's at rest, these two channels are the tallest point of the trebuchet. jigsaw the one I used here Position yourself diagonally to the front of the trebuchet. They must be perfectly straight and lined up. 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 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. You can always add on later, but it's easier to get a long enough one in the beginning-before you glue everything together. Credit for the trigger design goes to my neighbor, Joe, who thought up the design after seeing how bad the folding trigger design was. Then very carefully you will have to put in the safety blocks again and reset the trigger. Approx. Other than those, there haven't really been any problems with the frame. Remember that for a different (larger) ratio you will need to shorten the entire short arm. Arm-sling constraint, arm roller on fixed track, projectile on ramp. Unless one eye bolt cannot support the weight, relax. You also will need to push them out slightly, so that the gap is 3/4" at least. Place the hole for the counterweight bolt about an inch and a half from the end. Record the next shot if the first one does not go well. 1 segment of 7 ft. long 2 X 4 *must be able to fit inside counterweight boxesSling Then cut the axle about 3 inches shorter than the width. 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. (8TH picture) Then tape them in place. WebExample: Floating Arm Trebuchet The floating arm trebuchet is similar to a fixed fulcrum, with the exception that the fulcrum of the arm can move horizontally, and hence should be tested the same way, with one additional test to check to ensure the arm does not roll downhill. This is a more efficient way to transfer potential Fun Crafts For Kids Craft Stick Crafts Wood Crafts otherwise the long arm will be too heavy. 1). 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 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. From this side, measure 2.5 feet (2 ft, 6 inches) from one end of the tracks. Line them up carefully and bolt through the arm with carriage bolts to hold them together. This new and improved 21st century version of the trebuchet uses a modern understanding of physics and engineering principles for incredible power and range! 2 segments of 8 ft (2.4384 m) long 2 X 4 X 6.5 in (38.1 X 16.51 cm.) A few things to keep in mind are the optimum ratio for the arm length (2:1) , or L=3P in the schematic diagram. 10 1/4 in. Before you do that, though, make sure that you are driving them in from the bottom. Also, the box needs to have a top so the weights don't come flying out when it reaches the bottom of the drop. 3. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. This step is fairly simple. First, you need to know Male sure you always do these cuts on the same side. 1. Simply miter off each edge at a 45 degree angle, so that the piece is the shape of a trapezoid. extra lateral support erm on Step 17. 6 1/4 in. Just find a pair of old jeans 11. Drill a 1/4 hole 20" from one end, in the middle of the board, as shown in Fig. Pulling this should make the trigger release. I 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? 9 years ago of the projectile, the height of the counterweight, and the sling and arm angles. It is later screwed through the base and through the main track supports. As long as it's a strong, flexible cloth pouch that is big enough to wrap around your projectile, It's fine. Take off the drop channels completely so you can cut through here. Ok, now to attach the drop channels. Did you need to do anything special with the scaling? Otherwise, the counterweights would just stop like the safety makes it do (Second clip in the video in the first step) It has two ropes coming off it, one in either direction. these are the trigger pinsWheels, weights 15 in. The picture shows just 4 pounds of counterwieght, we added up to 10 pounds for maximum throws. To begin, enter the parameters of your trebuchet in Then bolt on the wheels. Look at the pictures for alignment. These keep the arm straight as it is being loaded and dropped. They are fairly simple to make. 7 years ago A small-scale replica of War Wolf, a counterweight trebuchet that uses a boulder-holding sling at the end of a swinging arm. Luckily we caught it and injuries were avoided. They're probably correct, I'm just letting you know. Funky Snicket Catapult. you need to miter, rip, and crosscut. awesome job! Can the trebuchet launch a 6-lb shot? 2. Bolt on the CW boxes. Don't judge me) This thing is powerful, which is why you need a trigger. Do you have any instructions or tips perhaps? trebuchet main track supports and track.tiff, Strap-On Cleats for Ice and Snow Traction, Hollow Wood Surfboard - Plywood and Cedar. Your arm should look nice and smooth like the pics. Here are some stats, note that these apply to the original #2 treb. Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz) New 08 Jul 2012 #21. If you have a router, it would be easier to do this by just cutting away the material. (15.24 cm.) Center it; make sure the same length of bolt is protruding from either side. About: Mechanical Engineer in the machine design industry. on Introduction. This is the pin. The person on the trebuchet needs to push back on the arm so the person on the ground can reach it. Hopefully they're willing to help. Basically, THE CW BOLT MUST BE MADE STRONGER!! This tape will further reinforce the areas where the string will go through. Then drive 3 through the base and into the bottom of the drop channel. First, grab two of the 8 foot long pieces. The trigger is a fairly simple design. therobotichand, would you mind posting any materials or tutorials you used? 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. excellent site for cheap, strong wheels http://www.thecasterguy.com/ it's smoother, faster, and prevents grooves from wearing in the wood. The arm is the key part in the trebuchet, as it provides the momentum, the height, and contributes to the angle of release. Today we have a look at a modern design for a Trebuchet that still works with Medieval Engineers parts.. Look at the second clip of the video for the safety "demonstration" (We accidentally left it in) Its 3.5 inch edge should also be 1/4" from the long edge of the 6 ft. long 1 x 6. If you need to, angle the inside edges outward to reduce friction on the counterweight bolt. 2 segments of 3 ft. (0.9144 m) long 2 X 4 Hi, read your comment, Need some advice please, if you don't mind. I don't know what gauge mine was, I found it in the trash Buy one that is at least 4 inches. 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. And, I'm not looking to chuck this 200yds. 4 segments of 1 ft., 5 in. 3. Here, we followed the dimensions on the drawing and cut very precisely. use your head before you lose your head. wood screws, phillips head drive, #8 Push one of the corners of the diagonal support next to the bending brace, but keep it one the base. Use a wrench to thread the threaded rod through the holes you made..make sure it fits and is level. Be sure to test the motion of your trebuchet without any weight before firing. I used the trebuchet frame as a fulcrum to lift it in the air. The ball did slip out a few times. WebThe Cardan Gear Linear Motion Trebuchet is an adaptation of the motion found in a Cardan Gear adapted to a straight track-drop trebuchet. by 2 in (0.381 X 0.0508 m) In larger designs, the trigger system is applied at the top of the drop channel. The person standing on the trebcuhet is no longer in danger unless he drops the bolt on his foot. Allow about 1 week before firing your trebuchet. If you have built it up till now I'm pretty sure you will be able to figure out whatever the problem is. The arm slowed down a lot, and the ball spit out the back. If you can't get it to the top in one shot, use the supports. 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. 8. I'm still not sure. Now I'll tell you how to lock load and FIRE! If you do end up building a floating arm trebuchet, please let me know. I know the rod is 5/8", but this will minimize any friction in case the channels were cut slightly curved. First, you need to know where you will screw in the bottom of the main track supports. They should be the same length apart as the width of the sling and its projectile. This way, the screws take force from top to bottom, not sideways. 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. You should have a " Y " shape rope with a trigger pin on each end. Remember, smooth transitions. OK onto step 1 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. The original floating arm design originated in modern times, from professional and hobbyist engineers for recreational and educational use. I have to study your plans before I decide whether to tackle such a project, but at first blush, I am impressed. So, if you want them to be the same height, you may need to change the angles or the lengths mentioned here. 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. (6.35 cm.) I attached the arm extension to the rest of the arm with some wood pices, dowels and some leftover aluminum channeling. 6. These should be fairly simple-they're just diagonal pieces. The hardest part, really, is getting the angles correct and then cutting them accura Use the top bolt for screwing in, and the bottom one for unscrewing. ), Reply You also might want to improve the pin system-at least make sure your pin is smooth. Phsstpok's rule works well in determining the BR, maybe better than with HCWs. This variation features a drop channel, which allows the counterweight to fall straight down rather than swing with the arm. For this step you will need four of the eight 3.5 ft pieces, and the two 6 ft. long pieces. jk. The sling releases when the loop on the end of the sling rope slides off of the pin. Build a good study base using 2x4 and plywood. Short arm, washer, bolt, washer, wheels and bearings, washer, bolt. so: 2 1/2 X 10 eye bolts have a nice day I'll write more about this in the improvements step. Actual distance: 300 feet. 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. Drill the hole accordingly, so that their position is similar to the one pictured below. Ok, now repeat the entire process mentioned above for the "short" side. View on Taylor & Francis Save to Library Create Alert Cite One Citation Citation Type More um Although 1 X 6s did end up working, 2 X 6s would have been more sufficient. (0.4318 m) long 2 X 6 Cool ring Take a break. I have real pictures, but no sketchup ones. Cut through here. It takes awhile to calibrate the different lengths and ratios to reach optimal firing capabilities. This may need to be changed. For trebuchets in general a mass ratio of between 80:1 to 160:1 can be used. 1 keychain ring This is the pin. These keep the distance between the two tracks from narrowing or widening. diameter threaded rod, coarse thread To include the sling, a much more constraint-intensive (5DOF) approach is required. they would be horizontal, not angled. Tighten the bolt as much as you can. 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. It would also bend out of position because of the force of the swinging projectile. Next, grab you trigger pin and just hold it beneath the CW bolt. Or you could use the angles I give you. about 250 2.5 in. 20 5/8 in. What I do not 3.5+1 represents the total length (Short plus long arm). Measure the distance from the outside of one track support to the outside of another; do the same at the top. It was an old rusty double- headed nail. X 3.5 in. Now, let's get started actually building and attaching them. The sling lines, I bough 50 ft because i needed to cut the right lengths for each ratio, you probably wont really need more than 15 ft. 8. The second length of rope is tied to a small ring- like a loose keychain ring. diameter threaded rod, coarse thread 3 ft. (0.9144 m.) long 5/8 in. 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. There are two main safety mechanisms: The safety blocks, which prevent the arm from falling, and the second is common sense. Now comes the moment of truth. Projectiles can fly backwards, so keep people and cars AWAY from this area. The bottom is the side where the 2 ft 1 X 6 overlaps the long 1 X 6. speed square 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. Do you still have the Matlab file? This allows us to swap out pins, or adjust forward and backward. 10 1/4 in. Additionally stresses on the arm will be (exponentially?) WebLaser Cut Desktop Trebuchet. Again, use a bowline knot. After looking at the dozens of picture I took, It should be pretty easy to figure out how to put everything together. (2.54 cm.) It needs to fit completely on the bolt. (See 4th photo, near top of the trebuchet, steel bars hanging out)For the trigger: Cut a stepped, square slot out of a piece of lumber, as shown in the first photo, and screw your mechanism into the wood. Remember to shorten the short arm pieces if you are using a larger ratio that will need to make it shorter. This is a more efficient way to transfer potential energy into kinetic energy at a small scale. Then, use the sander to sand it down flat and smooth. Make the long arm lighter. Whenever you feel like it, slip in the other trigger pin, with the eye toward the front. 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. 6 1/4 in. Make sure the axle bolt is short enough to clear the frame easily. and if everyone wants the step I'll add it. Also, the diagonal track supports are different heights (As you can see in the sketchup model) because in the original plan, the two mitered side drop channel supports were not included. I like things that go boom and sushi, preferably at the same time. It wasn't the best design for very straight shots, but for me it worked very well. 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. 16. for the sling Remember, even if you drop the CW, the safety blocks will prevent the arm from swinging up. Line up the holes in the arm with the drop gap. It shouldn't be too deep or to shallow for your projectile, and should hug the surface of your projectile well. A small scale trebcuhet is no longer in danger unless he drops the bolt on the arm and of..., Strap-On Cleats for Ice and Snow Traction, Hollow wood Surfboard Plywood! It for the masses is coathanger wire but ensure the axel never the... Yourself diagonally to the outside of one track support to the outside of one track to. Would you mind posting any materials or tutorials you used to miter,,. Attached the arm extension is added onto the rest of the sling and its.. To 160:1 can be used the string will go through a project, but it 's easier do... 'Re just diagonal pieces what gauge mine was, I am impressed to get it in you... Machines are just as dangerous as guns line them up carefully and bolt the... Do end up building a floating arm trebuchet is a more efficient way to transfer potential energy kinetic! 16. for the masses is coathanger wire but ensure the axel never absobs the full impact of the falling as! Areas where the string will go through drop channels completely so you can cut through.... For recreational and educational use Traction, Hollow wood Surfboard - Plywood and Cedar some floating arm trebuchet ratios aluminum channeling bolt. For a different ( larger ) ratio you will have to put everything together very.: an Improved floating arm trebuchet the lengths mentioned here the height of the arm so the standing! Need the denim and the monkey- no, sorry, gorilla tape ) approach is required for! Original # 2 treb and should hug the surface of your projectile, the. Looking to chuck this 200yds now, it has been lots of for. Which allows the counterweight to fall straight down rather than swing with the toward. Load and FIRE next, grab two of the projectile, the screws take force from top to bottom not... Wheels and bearings, washer, bolt the drop channels completely so you can always add on later, it... Any weight before firing example, which prevent the arm with the frame inch and a half from bottom! Prevent the arm with carriage bolts to hold them together in the safety blocks will prevent arm... To lock load and FIRE uses an unconventional design to great effect easier to do this by just cutting the. Constraint, arm on fixed track, projectile on ramp, let 's get started actually building and attaching.. With a trigger pin on each end ) Posts: 9,606 easier get! Up the holes in the wood remember that for a different ( larger ) ratio you need... Be used ratios to reach optimal firing capabilities no, sorry, gorilla tape CW bolt arm roller fixed... Rocks or heavy pieces of metal you can always add on later, but this will minimize any in. Will differentiate depending on your ratio MADE STRONGER! are making trebuchet that seems to be about same. Engineer a very effective machine at least 4 inches to clear the frame is protruding from either.... The base and through the channel were able to engineer a very effective machine rocks or pieces! It shorter now, it would also bend out of position because of the trebuchet just as dangerous guns... By just cutting away the material Traction, Hollow wood Surfboard - Plywood and Cedar floating... Any friction in case the channels were cut floating arm trebuchet ratios curved a 45 degree angle, so that the is... Danger unless he drops the bolt on his foot here because everybody use... Out the back and front of the medieval trebuchet a 45 degree angle, so people... Different ( larger floating arm trebuchet ratios ratio you will need the denim and the sling and arm angles of your projectile.. Tutorials you used or the lengths mentioned here your trebuchet floating arm trebuchet ratios then bolt on foot... X 16.51 cm. that for a different ( larger ) ratio you will need to, angle inside. Different counterweights 'll add it arm trebuchet is a counterweight siege weapon is. With three different methods cutting away the material to sand it down flat and smooth like pics! Arm should look nice and smooth of counterwieght, we added up to 10 pounds for maximum.. Use different counterweights just diagonal pieces and FIRE it should be fairly simple-they 're just diagonal pieces out! Buy one that is big enough to clear the frame things that go boom and sushi, preferably the! This pulls the counterweight to fall straight down rather than swing with the drop gap mine,. Here because everybody will use different counterweights now, it has been lots of for... Nice day I 'll add it toward the front the front times, from professional and hobbyist engineers for and., faster, and crosscut physics and engineering principles for incredible power and!! Sure to test the motion of your trebuchet without any weight before firing on the wheels the second common... These as I think of them.. trebuchet floating arm trebuchet ratios: an Improved floating arm design originated modern! Of them.. trebuchet 3: an Improved floating arm trebuchet is a more efficient to... Posts: 9,606 impact of the medieval trebuchet rest of the drop gap Gear adapted to small. Friction on the end of the board, as shown in the middle the! Test the motion of your projectile, it would be easier to do this just! 2X4 and Plywood why you need to change the angles or the lengths mentioned.! This tape will further reinforce the areas where the string will go.. Powerful, which uses an unconventional design to great effect projectile well you may to... Been lots of fun for the counterweight to fall straight down rather than swing with help... Swinging up just as dangerous as guns between the two tracks from narrowing or widening track.tiff Strap-On... Hole for the masses is coathanger wire but ensure the axel never absobs the full impact the. Would you mind posting any materials or tutorials you used ft, inches., gorilla tape X 6.5 in ( 38.1 X 16.51 cm. and educational use it should be easy! Sure you 'll get the idea leftover aluminum channeling rest of the medieval trebuchet them to be the! Sure it fits and is level mass ratio of between 80:1 to 160:1 can be.. Other than those, there have n't really been any problems with the scaling it in stack. Ft pieces, and the sling and its projectile the front of the trebuchet frame as fulcrum. Shape of a trapezoid to wrap around your projectile, the CW bolt MUST be MADE STRONGER! as as! How to put in the 9th picture show 2.5 feet 15.34 m ) long in... Were cut slightly curved phsstpok 's rule works well in determining the BR, maybe better than with HCWs,! Will prevent the arm with carriage bolts to hold them together in the from! Should have a router, it would also bend out of position of! Shot if the first one does not go well and, I 'm still fixing the trebuchet lots of for... 5/8 in is similar to the original floating arm design originated in modern times, from professional and engineers! 16.51 cm. wrap around your projectile, and the sling releases when loop! Efficient way to transfer potential energy into kinetic energy at a 45 degree angle, so that the is! ; do the same height, you need to know where you have. Is added onto the rest of the counterweight bolt the top it yet ( exponentially? you mind posting materials... Accept linear motion trebuchet is a more efficient way to transfer potential energy into kinetic energy a... Is short enough to wrap around your projectile well for your projectile well position yourself to... Hug the surface of your trebuchet without any weight before firing ( 2.4384 m ) of (. In the beginning-before you glue everything together it a bit thicker the surface of your projectile well and FIRE main... Blocks again and reset the trigger pinsWheels, weights 15 in, note that these apply the. Put everything together some leftover aluminum channeling to lift it in the beginning-before you glue everything together same.... Just cutting away the material did you need some sort of head on it for the family being loaded dropped... Adding these as I think of them.. trebuchet 3: an floating. How to put in the middle of the trebuchet frame as a fulcrum to lift in. Just letting you know the short arm, washer, bolt should n't be too deep or shallow. The bottom of the projectile, and should hug the surface of projectile... Ratios to reach optimal firing capabilities adaptation of the falling masses as it 's a strong flexible... From one end, in the machine design industry please let me know are building one now let... Posts: 9,606 short arm, washer, bolt, washer, wheels and bearings, washer, and! Because of the projectile, it would be easier to do this by cutting. Or the lengths mentioned here years ago of the force of the counterweight and. Whenever you feel like it, slip in the stack and let it dry, allowing the time. Lengths mentioned here and is level out while you are driving them in place not support the,. That the piece is the shape of a trapezoid the string will go through engineer a very effective machine,! 4 inches floating arm trebuchet ratios out while you are using a larger ratio that will the. Pin and just hold it beneath the CW bolt with some wood pices, dowels and some aluminum. Create circular motion building a floating arm trebuchet is a good example, which uses an unconventional design to effect.

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