EGR 345 Team ProjectFinal ReportNovember 17, 2005Team Members:Jonathan KolbRyan ParentNicole Vander VeldenLuke KoopsGVSU School of EngineeringEGR 345 – Dynamic Systems ModelingProf. H JackTABLE OF CONTENTSProject Objective........................................................................................................................1Design Constraints.....................................................................................................................1Design Breakdown.....................................................................................................................4Base Frame..................................................................................................................4Barrel...........................................................................................................................5Turret...........................................................................................................................5Motor & Gearbox........................................................................................................6Air Valve & Air Lines..................................................................................................6Hopper.........................................................................................................................7Loading Chamber........................................................................................................7Test Results.................................................................................................................................8Mechanical Test 1........................................................................................................8Mechanical Test 2........................................................................................................8Control Test 1..............................................................................................................8Firing Chamber Collar Motion...................................................................................................8Barrel and Turret Rotational Motion..........................................................................................9Electrical Schematic...................................................................................................................10Design Problems and Solutions..................................................................................................11Conclusions................................................................................................................................12Appendix A – BudgetAppendix B – Control ProgramAppendix C – Drawing Documentation2The objective of this project was to develop an automated device to fire wiffle golf ballsat four randomly activated targets. At separate times each target sent out an electrical signalindicating when the target was active. Once the device recognized the active target it had toaim, fire, and reload. The device needed to be lightweight, cost effective, and structurally rigidwhile maximizing the number of targets hit.Design ConstraintsSome design constraints had to be followed when designing the target acquisition andfiring system. The total weight of the machine must be less than 3Kg. The entire machine mustfit inside a one foot cube. The machine must be capable of firing 1.5in practice golf balls. Themachine can be controlled by a combination of pneumatic and electrical components. Oncecomplete the only thing that may pass into the team area, during competition, is wires andairlines. The device must operate in a safe manner for the protection of the people observing thecompetition, and the equipment that controls the competition. The judges will make the finalsafety decision before the competition. Any unsafe entries will be disqualified. There ismaximum budget of $200.00 that may be spent during the production of the device. Records ofall purchases must be kept for budget verification. There were incentives placed into the finalscore to encourage the minimization of some if the design requirements, such as: total cost,longest dimension, and total weight. 3Design BreakdownThis section describes the main features of the device. Each feature is described based onprevalent design factors and contributing function to the automated system. The number onFigure 1 corresponds to the numbered item.Figure 1 – Isometric view showing the main features of the automated wiffle golf ball device.1. Base FrameThe base frame supports the device and holds all acting features together. Thebase frame was designed as a V shape. This shape enabled the gun to havestability from side to side and front to back. The vertex of the ‘V’ was an idealposition for the turret axle and gearbox to be mounted while the motor and controlboards could fasten directly to the legs of the ‘V’. The base frame was made of41. Base Frame2. Barrel3. Turret7. Motor & Gearbox5. Air Valve & Air Lines7. Loading Chamber6. Hopperaluminum and was composed of three separate pieces fastened together to formthe ‘V’ shape. Mechanically fastening pieces together rather than welding themgave flexibility for later design changes.2. BarrelThe barrel guides the ball as it is pushed by high pressure air. The barrel of thedevice was made of PVC pipe. Pipe is purchased by inside dimensions (ratherthan outside dimensions). The inside diameter of the barrel was originally 1.56”I.D. (slightly bigger than a golf ball diameter) but was later bored out to allow foroversized wiffle golf balls. The final inside diameter of the barrel was 1.64”.PVC material is rigid and lightweight yet convenient to purchase. Using pre-manufactured parts saved cost and time when developing the device. A large hole(1.64+” diameter) was drilled through the wall of the barrel to allow only one golfball to load at a time. The barrel was fastened to an aluminum C-channel to allowother parts of the device to be securely attached. For example, the loadingchamber air cylinder.3. TurretThe turret mechanically rotates the barrel on a horizontal plane of motion. Theturret design consists of an axle, worm, worm gear and potentiometer. Thevertical axle, driven by the worm and worm gear setup, was attached to the barrelC-channel. When the motor was