Scale 1/12~1/14 RC Bulldozer

thingiverse

*** This is a small ~1/12 scale bulldozer based on Erdinger's Excavator tracks *** * The N20 geared motors lifting the blade +will+ get uneven and bind, so you will need to work out a way to get them back on level. Ask in the comments for how i solved this problem if you're not sure. ------------------------------------------------------------ *** With the parts available as of May 30 2019, you can build a functional machine ! *** ** I've started to add Cosmetic parts, glue these on where appropriate, or use small screws of your choice. I haven't cut the side grills because i plan to use them to kinda wedge the cabin top in place when you put the top on. Glue them only to the cabin top and not to the bottom, they will lift off with the cabin top. ** ------------------------------------------------------------ ***3D printed parts list:*** * One of each part, except : * * 2x Dozer_Tilt_Cylinder * * 10x Track_Middle_Wheels_MOD_2 * * 33x Track_Pad_Left (+/- 1) * * 33x Track_Pad_Right (+/- 1) * * 2x Lift_Cylinder_Shaft * * 2x pwrWhlStabi * * 4x counterwheel (1 half per STL gives 2 complete wheels glued) * * 2x trackGears (2 parts per STL gives 2 complete wheels glued) * * 68x 29mm lengths of your favorite 1.75mm filament to make track pad pins (Melt at each end with soldering iron or heated screwdriver tip) ***Non-3D printed parts list :*** * **2x N20 geared motors with M4x55 shaft** (Lifting cylinders) (See picture, cost about 3$/each on Ali) * * 400 RPM is very slow but strong * * 600 RPM seem to be the sweet spot between speed and torque * * 1000 RPM is too easy to stall, will not work * **2x Servos modified for constant rotation** (Tracks) (Either buy them or make them yourself, google "pwm servo hack") (The speed/torque of the servo will determine the speed/torque of your dozer, so pick accordingly ! Mine are Tactic TSX45, about right on speed/torque) * **2x (Mini 10amp ESCs without brake** (For the N20s) (Available for about 8$ or less on Ali) * **1x LiPo 2s** 5000mah hardcase. Not sure yet about the retaining system i'm gonna use. Probably Velcro.. (Put 2 of them in parallel (same voltage, double the mah) for more weight) / * **1x 4 Channels (min.) Transmitter w/ mixing and matching receiver** * - OR a Sabertooth ESC, you would then completly remove the track servo circuit boards and connect the servo motors right into the Sabertooth / * **1x BEC module** to power the receiver (Castle BEC 10amp or similar) * - OR power your receiver from your own 6v power source * - If you use a BEC, don't forget to remove the red wires from the Mini10 ESCs receiver plug, leaving the ground and signal wire there. (I use a Castle BEC Pro 20amp, with red wires removed from Mini10 ESCs) / * ** A butt-load of M3 screws of different lengths, M3 nylock nuts. Better buy a 250 variety pack on Ali and make sure you've got at least 10x M3x40mm / M3x45mm screws because they're uncommon and you need them for the track idler wheels ** -----------------------------------