Dual Mode Windup Car

myminifactory

My previous windup vehicles were open chassis designs, allowing me to observe the gears in motion and minimizing weight. The Dual Mode Windup Car is my first attempt at a rolling body design, yet I left the windows down to maintain visibility of the gears. For a description of "dual mode," visit https://www.myminifactory.com/object/dual-mode-spring-motor-rolling-chassis-26862. This design significantly increases weight over previous models, so I increased the final drive gear ratio from 1/25 to 1/16 to boost torque. To accommodate this change, I strengthened the axles and gears to handle the added stress. Testing revealed that this vehicle easily traveled around 40 feet on smooth surfaces. The wheels and body top shown in the photographs are designed for a dual extrusion printer, but single extrusion versions of all necessary parts are included. The first image is of the prototype, while the second displays an orthographic view of the bottom of the design from Fusion 360. The final image shows the output of the design from Fusion 360. To see the vehicle in action, watch this video: https://www.youtube.com/watch?v=7nEYIH4mcjE. You will need to purchase 16 "AS 568" size 222 (1 3/4 O.D., 1 1/2 I.D., 1/8" diameter) o-rings for the tires. If you have any questions, please don't hesitate to ask; I may have forgotten a file or two. Designed using Fusion 360 and sliced with Cura 2.3.1, this vehicle was printed on an Ultimaker 3 Extended in PLA. Printing Details This design requires precise printing settings to achieve optimal results. Designed using Fusion 360 and sliced with Cura 2.3.1, print the following parts at .1mm resolution: "Key.stl", "Spring.stl", "Axle Spring.stl", and "Axle Gear Idler Large.stl" at 100% infill; the remaining parts at 20% infill. Before assembly, test fit and trim all parts as necessary for smooth movement of moving surfaces and tight fit for non-moving surfaces. Study "Assembly.stl," carefully noting the locations and positions of various components as assembly proceeds. It is crucial that "Cross Member.stl" and "Axle Gear Idler Large.stl" fit very tightly between "Body Left.stl" and "Body Right.stl" to maintain torsional stability. I assembled Dual Mode Windup Car in this order: 1) Position "Axle Spring.stl" into "Chassis Right.stl," then press "Spring.stl" and "Pawl.stl" onto "Axle Spring.stl." 2) Press one each of "Cross Member.stl" into "Chassis Right.stl" at the front and rear. 3) Press "Gear Floating Pinion Guide Right.stl" into "Chassis Right.stl." 4) Press "Gear Floating Pinion Guide Left.stl" into "Chassis Left.stl." 5) Press "Axle Rear.stl" onto the axle spring assembly, aligning it with the spline on "Axle Rear.stl." 6) Position the rear axle assembly in "Body Right.stl." 7) Position the floating idler assembly in "Body Right.stl." 8) Position "Gear Pawl.stl" onto the axle spring assembly. 9) Position "Gear Idler Large.stl" onto "Axle Gear Idler Large.stl." 10) Position "Spacer Axle Gear Idler Large.stl" onto "Axle Gear Idler Large.stl." 11) Press "Body Left.stl" onto the body right assembly, ensuring that the front and rear cross members are flush with the outside surfaces of the body sides. 12) Install o-rings on all wheels, then install one each of "Wheel Right.stl" and "Wheel Left.stl" onto the rear axle assembly. 13) Press "Axle Front.stl" into the remaining "Wheel Right.stl," then slide the assembly into position and press the remaining "Wheel Left.stl" onto the axle assembly. 14) Attach "Body Top.stl" onto the front and rear "Cross Member.stl." Enjoy your Dual Mode Windup Car!