Mouse trap buggy manufacturing plan

Essay by hoiningliu March 2009

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Manufacturing Plan for Mouse Trap BuggyStepLesson/ DateActivityResourcesSafety/Quality CheckEst. TimeActual Time takenFRAME11 (10/31/08)Collect materials4 pieces of aluminum Strips, rivetsAre the aluminum strips of the right size in terms of both length and width? Are there any sharp edges on the aluminum strips which could cause danger?52Measure the size of aluminum strips and mark out the size (400mm length, back width 200mm, front width 100mm)Ruler, Engineers square, Aluminum strips, Scriber Are the aluminum strips exactly 90 degrees strait? If not, file the strip with a file. Does the length fit the size specification?403Cut aluminum stripsAluminum strips (4), Hacksaw, Tin snipsAre there any sharp edges on the cut? Is the length of the two side pieces of aluminum the same? Be careful when using the hacksaw and tin snips42 (11/04/08)Mark the mid point of the drilled area (corners) Aluminum pieces (4), Center punch, Hammer Is the marked midpoint of the drilled area correct? 205Drill holes on the ends of all four pieces of aluminumDrill press/ Hand drill, Aluminum pieces (4)Are the drill bits the right size prior to riveting? Are the holes in the correct position? Are safety precautions followed when drilling (safety glasses)6Rivet the four pieces of aluminum strips togetherRiveting gun, Rivets (4), Aluminum pieces (4)Are the aluminum strips in the right shape of trapezium? Is the front and back strips of aluminum parallel to each other? Are there any sharp edges on the frame? If required, file the frame5073 (11/07/08)Mark the mid point of the holes to be drilled on the completed frameAssembled aluminum frame, engineer square, center punch, hammerIs the marked midpoint of the drilled area correct? Is it exactly in the center of the aluminum? Be sure to measure the exact point in the middle208Drill holes with 3.5

diameter on the ends of each side of the frame for the rod (which would be inserted later)Drill press/ Hand drill, assembled aluminum frameIs the drill bit the right size prior to diameter of the rod? Are the holes in the correct position? Are safety precautions followed when drilling (safety glasses)9Drill 2 holes with 3.5mm diameter towards the back of the frame, 30mm away from the previous hole drilled for another rod (to be inserted later)Drill press/ Hand drill, assembled aluminum frame 20MOUSE TRAP104 (11/11/08)Measure the size of the mouse trapRuler, Mouse trapBe sure to measure accurately the size of the mouse trap511Mark out the lines on the mouse trap which are going to be cut offPencil, Ruler, Mouse trapMake sure the lines are straight and follows the exact shape of the aluminum frame, otherwise it wouldn't fit1012Cut the mouse trap so that it fits the aluminum frameBand saw, Mouse trapFollow all safety precautions when cutting the mouse trap. After cutting, is the mouse trap in the shape of a trapezium and does it fit on the frame? If not, cut more1013Drill holes on the front part of the mouse trap and surrounding the backDrill press, Mouse trapThe holes are for reducing weight, however do not cut too much from the mouse trap, as the weight on two sides would be unequal1014Sand the mouse trapAbrasive paper, Mouse trapMake sure there are no sharp corners on the mouse trap so that it wouldn't hurt others5BACK WHEELS155 (11/18/08)Collect materials: acrylic 3mm thick2 Pieces of acrylic, one blue one purpleMake sure both pieces of acrylic have to be at least 240mm diameter in length1016On Coral draw, draw 2 circles with the radius of 120mmComputerMake sure the size of the 2 circles are exactly the same, otherwise the wheels would be unbalanced5017Draw the decorations of the 2 wheels on the previously drawn circles by drawing ovals spread equally aroundComputerMake sure the patterns and each of the decorations are identical, otherwise the weight of the wheels would be unbalanced, therefore there might be a possibility of the buggy going in other directions18Draw a hole with diameter of 4mm for axel to go throughComputerMake sure that the hole is exactly in the center of the wheel19Put designs on floppy disk and cut it out from the laser cutterFloppy disk, computer, laser cutterAre the safety precautions followed when using the laser cutter? Careful not to set the cutter on fire. Are the completed wheels what I expected it to be?2020Once the wheels are cut, push out any extra parts that are not fallen out of the board yetAcrylic wheelsMake sure the wheels are properly cut before taking it out1FRONT WHEELS216 (11/25/08)Collect materials2 Pieces of acrylic, both goldMake sure the pieces of acrylic have to be at least 150mm diameter in length1022On Coral draw, draw 2 circles with the radius of 75mmComputerMake sure the size of the 2 circles are exactly the same, otherwise the wheels would be unbalanced5023Draw the decorations of the 2 wheels on the previously drawn circles by drawing the shape of flower petals spread equally aroundComputerMake sure the patterns and each of the decorations are identical, otherwise the weight of the wheels would be unbalanced, therefore there might be a possibility of the buggy going in other directions24Draw a hole with diameter of 4mm for axel to go throughComputerMake sure that the hole is exactly in the center of the wheel25Put designs on floppy disk and cut it out from the laser cutterFloppy disk, computer, laser cutterAre the safety precautions followed when using the laser cutter? Careful not to set the cutter on fire. Are the completed wheels what I expected it to be?20FRONT WHEEL, BACK WHEEL AND GEAR AXEL267 (11/25/08)Measure and mark 2 pieces of 3.5mm diameter copper rod to the approximate length of the frame, leaving 40mm space on each sideRuler, Vernier Calipers, Scriber, Copper rodBe sure to check whether the copper rod is the correct diameter using the vernier calipers1027Cut the copper rod on the marked lineCopper rods, SawBe careful when using a saw15ASSEMBLING MOUSE TRAP AND FRAME287 (11/25/08)Gather materials2 pieces of balsa wood, mousetrap, frame 1029Measure and mark balsa wood to fit the frameRuler, pencil, 2 pieces of balsa woodMake sure it is measured accurately1030Cut balsa woodSaw, 2 pieces of balsa woodBe careful when cutting1031Mark the place of a hole on balsa wood, aluminum frame and mouse trapScriber, ruler, center punch, pencil, balsa wood, frame, mousetrapMake sure it is measured accurately20328 (11/28/08)Drill a hole at each end of the balsa woodhand drill, balsa woodpeaceful when drilling1033Drill a hole at the marked point of the framehand drill, framebe careful when drilling1034Drill a hole on the marked point of the mousetraphand drill, mousetrapbe careful when drilling5359 (12/02/08)Attach all balsa wood, frame and mousetrap with screwscrews, mousetrap, frame, balsa woodmake sure they are all aligned 30ASSEMBLING FRONT AND BACK WHEELS TO THE FRAME369 (12/02/08)Insert a small gear into the middle of the back rodCopper rod, small gearMake sure small gear is secured and in the center537Insert the copper rods into the holes on the frame which were drilled earlier (one at the front, one at the back of the frameCopper rods, frameLeave an equal amount of space on each side of the aluminum frame538Push the wheels into the two rods, two back wheels at the back, and two front wheels at the frontFrame with copper rod, 2 back wheels, 2 front wheelsHandle the wheels carefully, as they are made of acrylic and if forcefully bent, it would easily break1039Add a ball bearing on each side of the wheels to reduce frictionBall bearings, frame with copper rod and wheels 540Add an axel hob on each side to secure the wheels and ball bearing along the rodAxel hobs, frame with copper rod, wheels and ball bearingsMake sure all axel hob, ball bearing and wheels are secured54110 (12/05/08)Insert the big gear into another rodCopper rod, big gearMake sure big gear is secured and in the center542Insert copper rod into the middle holeCopper rod with gear, frame with wheels and mousetrap attachedLeave an equal amount of space on each side of the aluminum frame543Add an axel hob on each side to secure the rodAxel hobs, frame with copper rod 5ATTACHMENT OF STRING4410 (12/05/08)Measure and cut a piece of spider string approximately the length of 90cmScissors, spider stringBe careful when using scissors1045Attach one side of the spider string to the mousetrap lever and the other end wrapped tightly around the small gearSpider string, frame with wheels, gears, rods, and mousetrapMake sure the spider string is wrapped around the small gear as tightly as possible15*Extra Lunch time/ Break time sessions could be added in order to complete the create at assigned timeEvaluation of plan:My plan is very detailed and clear to read, as I describe every procedure in depth, and I explain the processes, materials needed, and any safety precautions or quality checks needed. I think by just following my plan, others would be able to make the mousetrap buggy, because I also indicate the time and the dates of each process. However, I think that I could improve on my estimations in time, so that if others had to follow my plan, they would have a clearer understanding and a better overview of the amount of time they would require to complete the certain process, so that they could arrange the time better. Also in my plan, I think I could add in lunch or break time sessions, so that there would be time remaining for my partner and I to test our buggy, before actually submitting the final product. That would be more feasible and efficient because just in case there are problems with the buggy which needs to be fixed, it can be identified and resolved in a lesson of time.

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