Hi my name is Chris i am from australia and i am 15
and i am new to the forum, I am doing my first electric skateboard build and would like a little insight and some help.
my parts:
Motor: sk3 213 Kv
esc hobbyking xcar 120a brushless esc
battery: 2X turnigy 5000 25c lipo battery
Transmitter: Gt2b
trucks: caliber
wheels 76 mm koston 83a ( i know koston the price was unbeatable tho)
bearings: bones reds
deck: BULLDOG LONG PIG (40" x 10.5")
pulleys: steel 14 tooth HTD belt pulley, 3d printed (ABS) 36 tooth pulley and a HTD 9mm 300mm belt
motor mount: Self made aluminium clamp bracket
I would like some feed back on 3D printed pulleys the following images are on i printed it seems very sturdy and rigid but in the long run I’m not so sure on how it will hold up
Also the wheels I bought are solid and don’t have holes like abec fly wheels. I was wondering the best
technique for mounting the pulley to the wheel, I have a drill press at home and was wondering of drilling directly through the wheel like boosted boards do and putting bolts through the wheels.
For the motor mount i have been experimenting with motor mounting options, I will start to draw the bracket up and prototype with my 3d printer and ether get it made with a water jet or a cnc or even a plasma cutter.
this is a quick bracket i knocked up with 1/4 inch aluminium in the end i will be using half inch aluminium.
for the motor pulley i orderd the wrong one with only a 6mm bore instead of my intended 8mm bore but i made up for this issue by counter sinking the 6mm hole to 8mm at the top and then lined it up with a 8mm bit and drilled it, i was surprised how centred it is perfect, i continued running the 8mm bit up and down in the hole to make it that 0.1mm bigger for the sk3 motor shaft. I need some advice on the mounting of the pulley i am intending on grinding a flat spot on the motor shaft i am not sure on what kind of screw to use to secure the pulley on the shaft any suggestions?
Nice work. Good to see another aussie on here.
I use 2 grub screws and a couple of flat spots filed in the shaft to hold my drive gears on. Just make sure you use loctite to hold them on.
I have tried a metal file, a dremel and also drill press for modifying/creating flat spot on the motor shaft. However the best result for me was using a grinder.
its a good idea to wrap the motor in some plastic material and tape up any holes so it is protected from any particles/filings entering inside the motor can.
Yeah I punch the shaft through a plastic bag so I dont get shavings in the motor, and then file a couple of flat spots in the shaft. I have loctite on all my motors at the moment so I cant really take a photo.
Hi Chris, Check this method out used for mechanically securing pulleys onto enertion motor shafts, this method probably cannot be achieved at home unless you have special equipment but It might help you with some new ideas.
My deck arrived today, 40/10.5". I started positioning the electronics. I still don’t have a motor bracket need to finish my design currently drawing up one in 123d and will 3d print prototypes then when i finalise i will ether use my new x carve to cnc the motor mount or get it plasma cut.
I am tempted to modify the board a little like rounding off the tail an pulling in the tale a bit.
