...A new one! [low-cost dirt bike] -- second test video

[crossbreak]

We do this by using I2C communication with the BMS. All battery states are available in the LCD that way and you only need 2 wires to the handlebar. SPI would also be an option. Here you can see that in a video http://endless-sphere.com/forums/viewtopic.php?f=2&t=47124&start=25#p767268

 

[silvocross]

As said before, this is a low cost build so I have to find the right trade off between cost and performance of the components.

The brakes are not an exception. I'm using components coming from motorbikes because of their high availability as used parts.

For the front side, I bought a 2 opposite pistons caliper coming from a 250cc scooter.

Looking for a reduction of mass and dimensions of the caliper, and needing a reduction of the braking power (it would be too much for the weight of my bike) I modified the second shell removing the relative piston.

In this way I should get a slimmer caliper with a good feeling and still enough braking power for my needs.

Obviously with this mod I'll need a floating mount and/or a floating brake rotor. :wink:

 

[silvocross]

The pinion has been machined using the spline of a standard pinion connected to the teeth of an industrial gear.

some additional work on brakes now, and maybe in a couple of weeks there will be the first test

 

[silvocross]

To mount the front disk (coming from an Husqvarna WR125) on the wheel I turned an aluminum bracket. I think I'll add 4 more holes for sake of lightness.

 

[silvocross]

 

[farmkid4]

Very nice keep up the good work!

 

[kfong]

Great job, bicycle tires look anemic on your build. Skinny motorcycle tires would be my call, then you won't have to deal with tire flats. I'll have to build a bike from scratch one day, looks like a lot of fun.

 

[silvocross]

You're right, this 1.95" tyres are too slim for the bike.
I'll use larger downhill tyres when finished! :wink:

 

[silvocross]

For every build there's always a milestone.
For me, after more then a year, the very first test is an huge importance.
A lot of things are missing, and as you can see I only tested it in the first gear. It will take a lot of time yet for a complete road test, but wow... I'm really happy now!

http://www.youtube.com/watch?v=WsqUiv8Gz5Q

 

[panurge]

I'm so happy for your first success!!!!

Ah....I know It is really hot these days in Italy, but hey, better to put on some real shoes during a bike test!!!!
I'm Waiting keen to see/hear the shifting test soon....
All the best.....

 

[wannesd]

Great build, awesome implementation of the software!

I'm starting school next year for mechanical engineer, here in Belgium. Although I'm already 30, never too late for second chances :wink:

 

[silvocross]

I'm so happy for your first success!!!!

Ah....I know It is really hot these days in Italy, but hey, better to put on some real shoes during a bike test!!!!
I'm Waiting keen to see/hear the shifting test soon....
All the best.....

Ha ha you're right! But you know, I was so excited for the first test..

Thank you very much Lorenzo, I have good news for you, I'll contact you soon... :wink:

Great build, awesome implementation of the software!

I'm starting school next year for mechanical engineer, here in Belgium. Although I'm already 30, never too late for second chances :wink:

Thank you, and good luck for your studies!

 

[silvocross]

After a great mechanical step, I'm working to implement an uglier but useful interface for my controller.
This detailed mode will help to fine tune my bike, having all informations in a single screen.

http://www.youtube.com/watch?v=A2ipTw1UGsg

 

[silvocross]

I covered lateral panels with carbon look adhesive

 

[torker]

Looked at your project. Awesome look. hopefully another video soon..

 

[silvocross]

Added the two charging ports:

 

[silvocross]

Finally I have a working front brake, so it's time for a second test.
This is how it runs in second gear (max speed is about ~50km/h), I still need to test the other 2 ratios.

The next step will be figure out how to insert transitions in video editing.....

http://www.youtube.com/watch?v=ktn1pLUofco

 

[AussieJester]

Video blocked in my country?

KiM

 

[silvocross]

Video blocked in my country?

KiM

mmmm, that's strange!
Let's see if this works....

[youtube]ktn1pLUofco[/youtube]

 

[Skalabala]

Why did this thread just die??

 

[macribs]

Yeah that was really too bad. Didn't see this thread before today and as I started to read from post 1 I got more and more excited to see the end result. Then 6 pages later it turns into nothing. I mean the attention to details and craftsmanship is really something. And the way he started out to automate things looked promising. Probably got caught up in the RL, graduated and got a job outside Italy like he planned for and was too buzzy to finish. Or maybe he started using crack and heroin? /joke.

 

[Hillhater]

My money would be on some form of Female distraction ! :lol: 8)

 

[Ratking]

My money would be on some form of Female distraction ! :lol: 8)

Oh, thats the worst. They steal focus like nothing I have ever experienced with their magic lady parts and other dirty tricks :lol:

But I still like them <3

 

[Skalabala]

Hahahahaha! You guys :lol:
I want to build a gearbox like that for my big block motor.
Because I want to be able to go up a hill and put minimum strain on components and I want a decent top speed 8)
And I love the sound of ebike shifting gears!
But now the other factor, how much power will the gearbox eat?