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Dual 9mm belt project

Hey guys,

I have been working on this project for a little while now. I have read about people snapping/stripping belts and want to prevent that from happening to me so I decided on a dual 9mm belt setup. My dad is a machinist so I have access to all kinds of machines. I know I am going to have to modify mounts and trucks to make this fit but other than that it should be cake. Here are the 2 rough cut pulleys as of now.
Both are aluminum. 14 and 36 tooth Totally overkill but should look pretty sweet and allow plenty of torque transfer. I’ll update when I get everything finished up (probably after holidays)

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The pulleys look awesome, what technique did you use to machine the grooves?

Have you thought about using 15mm belts? 5m HTD is available in 15mm as standard. I know that is slightly less than the combined 18mm width from 2*9mm belts but wouldn’t make much of a difference for the added simplicity. I know boosted boards use 15mm belts but they also use 3m pitch.


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Yep I thought about going with the 15mm but I thought it would be nice to run 2 belts as to have a backup if one failed (rocks or something poking holes in) Really no other reasons behind it lol.

The pulleys were cut down to width on a lathe and then cut the groves out with a cnc mill. Took a few tries to get the correct size and spacing.

cool they look really nice, I have access to a waterjet cutter at Uni so was thinking of getting some pulleys cut, not sure how the kerf would affect the performance though. I might have a go at making some on my CNC router, its lacking the required stiffness for aluminium although possible its just slooooow.

The only thing I would say about using 2 belts next to each other is they may start to slip over each other during operation. If you made a thin plate that ran between the 2 that might work better.

Thanks for the tip! I will do some testing when it’s done.

Good luck with yours!

sweet be sure to share some photos when your done, if you’ve got any during machining i would like to take a look also :smile:

Got the pulleys on and did a test run, so far so good! I had to use a few washers on the inside of the axle to give it enough room to fit and line up the pulleys ( without modifying the truck/mount). Have just enough threads to hold the wheel on. Totally overkill but it’s done now :slight_smile:

Whose motor is that?

That’s a Tacon Big Foot 160.

How did you fit the 18mm on the shaft?

That’s a tacon bigfoot

How big is the shaft? I thought it was short like a SK3?

It overhangs a bit. Shouldn’t cause any problems.

Yup! Never had an issue using these motors.

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I’m offended you’d ask such a personal question :blush:


All joking aside, this is a great job by you and your dad! @sk8ace did the motor pulley end up with just teeth across it’s face? This really makes single drive setups bullet proof!


Thank you!

Here’s a quick side shot,

You can see that it’s open on one side and raised up on the motor side.