#Trebuchet range calculator software
#Trebuchet range calculator free

Our arm was made of many pieces of layered plywood held together with resin and deck screws. 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) You want to keep the width relatively narrow, but wide enough to accommodate whatever projectiles you plan to use. A few things to keep in mind are the optimum ratio for the arm length (2:1), or L=3P in the schematic diagram. We'd have done much better with something like this. it's smoother, faster, and prevents grooves from wearing in the wood. I'd also advise implementing a metal sheet on the rails, instead of bare wood. I haven't seen much information on dynamic tuning for the f2k, but we did an estimate of the static loads at the critical points and kept the stresses around 1/4 of the yield strength of the steel. Consider how much weight you want to use, and size your shafts and frame accordingly. 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). Consider cost and use whatever spare or donated materials you can find. We spent around $300 in lumber and concrete, and several hundred dollars more on metal shafts, plates, etc. Using the dimensioned drawings, estimate the amount of materials needed. NOTE: all CAD modeling was done using student software, for educational purposes.

#Trebuchet range calculator free

Feel free to use them for educational or personal use. I've uploaded PDF's of the CAD drawings as well as a general schematic diagram for an f2k. 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.

#Trebuchet range calculator software

SolidWorks was used here, although any CAD software or even a hand sketch would be ok.