OpenRC 4-Wheel Drive Go-Kart with Ackermann Steering

thingiverse

OpenRC 4-Wheel Drive Go-Kart with Ackermann SteeringThe model is inspired by Lego Go-Kart 1972:https://www.toysperiod.com/lego-set-reference/technic/model/race/lego-1972-go-cart/The custom electronics has been designed around the Esp32 processor. The controlling software can be found in github at:https://github.com/projunk/RaceCarESP32Two configurations are currently supported:BR2830 850Kv motors with 2S Battery (NANO_TECH 4200)see e.g.: https://www.amazon.in/Generic-Racerstar-BR2830-Brushless-Airplane/dp/B07PCMDCMFTheoretical Top Speed: 113 Km/h5010 360Kv motors with 4S Battery (MULTISTAR 4000)see e.g.: https://nl.aliexpress.com/i/32479766898.html?gatewayAdapt=glo2nldTheoretical Top Speed: 96 Km/hThe scale factor compared to Lego parts is 3.0Printed Parts (already scaled):BatteryHolderPlateStraps_MultiStar4000.stl (2x) or BatteryHolderPlateStraps_NanoTech4200.stl (2x)ChairHolderHingePlate.stlElectronicsBrick.stlElectronicsPlate.stlPlate_1x2.stl (2x)Plate_2x8.stlRim_motor_2830.stl (4x) or Rim_motor_5010.stl (4x)SlickTire_2830.stl (4x) or SlickTire_5010.stl (4x)servo_connector.stltechnic_brick_ackermann_left.stltechnic_brick_ackermann_right.stltechnic_brick_motor_left.stltechnic_brick_motor_right.stltechnic_brick_servo.stltechnic_pin_with_friction.stltechnic_plate_toothed_end.stl (2x)technic_plate_toothed_end_ackermann.stltechnic_steering_arm_motor_M8_left.stltechnic_steering_arm_motor_M8_right.stlPrinted Parts (to be scaled in slicer with factor 3.0):HingePlate2Fingers.stlMinifigTorch.stl (2x)Plate_1x3.stlPlate_1x4.stl (2x)Plate_2x3.stl (4x)Plate_2x4.stl (3x)TileWithGrove.stl (2x)technic_axle_3.stltechnic_axle_4.stl (2x)technic_axle_6.stltechnic_axle_8.stltechnic_axle_pin_no_friction.stl (2x)technic_brick_1x8_m4.stl (2x)technic_bush.stl (4x)technic_bush_toothed.stl (3x)technic_connector.stl (8x)technic_gear.stltechnic_gear_rack.stltechnic_wedge_belt_wheel.stltechnic_wedge_belt_wheel_grip.stlOptional printed parts:BodyTop.stlHelmet.stlMinifig_arm_left.stlMinifig_arm_left.stl (mirror in slicer)Minifig_body_bottom_plate_MultiStar4000.stl or BatteryHolderPlateStraps_NanoTech4200.stlMinifig_hand.stl (2x)Minifig_head.stlLego minifigure is based on:https://www.printables.com/model/24298-lego-joRecommended Materials:PLA (30% infill)ABS (30% infill): axles,pins,technic connector, bushes, rimsNinja Flex (10% infill): technic_wedge_belt_wheel_grip.stl, SlickTire_2830.stl, SlickTire_5010.stlHardware:bearing MR128ZZ (6x)Electronics:4 in 1 ESC (30A)Power distribution board Acceleration sensor: MPU 6050receiver (fly sky 3 channel FS-GR3E)servo: MG 946Rneopixel Ws2812: (2x)for other electronics parts see drawing: "Schematics_ESP32.png"Software Features:webservice which either connects to local network or creates its own accesspoint if local network cannot be reachedwebservice shows telemetrics, speedo and settings. Settings can be updated on the fly and are savedAcceleration sensor input is used to help steeringIn case of taking a turn, the inner wheels are slowed down to help steering around a cornerLED string shows status (armed/disarmed) and indicates driving directionsRemarks:a custom name can be generated for BodyTop.stl using the BodyTop.scad source fileprint technic_wedge_belt_wheel_half.stl twice and glue parts togetherprint technic_wedge_belt_wheel_grip_half.stl twice and glue parts togetherprint technic_gear_half.stl twice and glue parts togetherAlternatives for the glued “half” parts have been added that can be printed as a single piece:technic_gear_rounded.stltechnic_wedge_belt_wheel_easy_printable.stl