Hi guys,
after riding my build for a couple of weeks now I wanted to show it to you and get some (hopefully nice) feedback. It all started with a lot of reading here, on endless sphere and in a German esk8 forum. Due to limited funds and the not so perfect supply in Germany I basically did as much myself as I possibly could. So I made the mount myself (first out of 12mm PVC and then after it broke out of 10mm aluminium), modified industrial pulleys to fit, used a friends 3D printer for small stuff and put it all in a Tupperware box under a cheap ebay deck.
My goal was to create a commuter board - so size was also an issue. I wanted to keep it as short as possible so that I could still carry it and settled on a 40inch bamboo deck with a 67cm wheelbase. I cut the kicktail off. It has almost no flex - so perfect for this kind of thing. The deck was 34€ including shipping. https://images-na.ssl-images-amazon.com/images/I/31e-A0N7PhL.jpg
My Hobbyking order then included an SK3 149kv motor, 2x3S Turnigy 5000mAh batteries, an X-Car beast 150A ESC, a Reaktor 250W charger and XT90S plugs -> ~200€ I should have ordered a programming card with the ESC as the settings are not perfect - but it works. I removed the plastic housing and cut the fan to make it silent and reduce the height of the ESC. No problems so far with overheating!
The remote is a badwolf mod GT2B for which I only had to pay for the actual remote -> 25€
As you can see in my other thread I had some problems with the selfmade motor mount but this should be solved now.
The pulleys and the belt I got from industrial supplier hug. I calculated the theoretical top speed and settled on a 20/28t gearing. To fit the motor shaft and the 80mm Kegel wheels I had to use a lathe and drill press. Basically I only made the center holes wider and drilled 5 holes in there for M6 screws to hold the wheel. M6 fits through the kegel rim without any drilling necessary. A grub screw holds the motor pulley in place with a filed flat spot on the shaft -> ~14€ for 9mm belt and both pulleys
For the longboard parts I settled on the popular stuff: 44° 180mm Caliber II trucks and Orangatang 80mm wheels -> 118€
This brings the total to ~400€.
Over the weekend I put a battery indicator in there as well which works quite nicely with the semi transparent plastic lid of the box. For the electronics I put a selfmade 2x3S y-cable in and connected the balance leads to a selfmade D-Sub 9 connector (similar to what @oriol360 showed). That way I still have to open the case to charge but it is less of a hassle. Range is ~10-15KM - at full speed obviously less but I have only ever ridden it once at its top speed of ~40km/h (38 according to the GPS but the batteries were already a little lower than 4.1V at the time I reached that). I charge them as soon as they drop below 3.7V and up to 4.1V at 0.5C to keep them healthy.
For a power switch I was lucky that the Beast ESC has its own small switch. I cut the red +line and soldered a flip switch in series that I could place through the box. this is also where I connected the voltage meter (the ESC switch lines are provided with the full battery voltage ) so that it does not drain the batteries when the board is turned off.