• Steering reinforcement and display

    Peter Pötzi • 04/28/2019 at 21:58 • 0 comments

    As the old steering wheel is designed for kids and will not withstand the acceleration of the motors and adults, it needs to reinforced with a 3D printed part. The files can be found on the files tab.

    On the lower side, there are 2 inlets for aluminium parts with inner threads, that you can use to fasten the steel steering rod with 2 M6 screws:

    On the top side, the original plastic steering wheel fits the 3D printed part perfectly. There are also 4 cable channels which can be used for the joysticks and the display and further accessories.

    When everything is assembled you have a bobbycar with a stronger steering wheel:

    Now, you can also print the display holder parts and mount a standard 2.2" SPI display:

    For the throttle pedals, I used xbox 360 controller trigger buttons:

    The RJ45 connector is used for the 3.3V to the display and the SPI pins. There is no actual ethernet on this cable, but it still looks like a "power over ethernet" system

    The display is freely programmable.

  • Mechanical build - front motors

    Peter Pötzi • 04/28/2019 at 21:28 • 0 comments

    To convert the front wheels to electric, I first 3D printed adapters, which can be used to mount the motors on the plastic frame:

    The aluminium parts reinforce the 3D print:

    Together with the other part it looks like this:

    Now it will just replace the original plastic steering system:

    The original plastic part that holds everything together can still be used:

    Also the steering is still done with the original 10mm bent steel rod:

  • Mechanical Build - rear axis

    Peter Pötzi • 04/28/2019 at 21:21 • 0 comments

    To convert the bobby car to electric , I did remove the original plastic wheels and replaced them with 6.5" BLDC hub motors which can be found on hoverboards.

    First, I used a saw to remove some plastic from there area where the original rear wheels were and made 2 aluminium plates, one with 2 grooves for the motors and a lot of screw holes.

    The grooves and M8 screw holes are needed for the hub motors:

    The aluminium plates are screw onto a wooden block, that is also mounted on the plastic frame of the original Bobby-Car.

    The bottom of the whole Bobby-Car now looks like this:

    The cutout in the middle is needed for the electronics, which will be added later.