MBS atom 85

[galp]

I had time today to do some things.


Those are my brakes. They are just like standard MBS v brakes, but i think 70€ for 2 pieces of aluminum is too much so i made my own. They work just great.

I also engrave my name in it.

This is how the board looks now. ESC is in that pink box with fan on top of it.

You can see the 3d printed pulley in this picture.

The baterry pack. 2x 10S 5Ah LiPo

All my wires are led under the board.

This is MSP430 micro controller on proto board and a standard thumb throttle for e-bikes mounted with brake handle. There is also a rc servo just for testing proposes. I'm also going to hook up a LCD on that micro controller for displaying speed, voltage, distance and so on.

Throttle and brake handle sits in hand well.

 

[daverobson08]

Really nice project this mate. Have you got any more details on how you made your brakes?

 

[galp]

If you have cnc or know a guy who has it then no problem. I can send you the cad files if you want, just tell me what format of file do you prefer. I actually copied official brakes from MBS.
http://store.kittyhawk.com/MBS-V-Brake-Kit-For-Landboards-P1626.aspx

I have all the necessary machinery at home, so i made my own brakes but for 60$ i don't really think it is worth the time. I never actually milled aluminum before (just plastic and wood) and i learned a lot with making these. It's up to you.

One more thing.
I can see that your board doesn't have the hole for brake mounting, like mbs trucks does. So you will have to figure out some kind of mount.

You can see the bolt holes that i'm writing about in this picture:

 

[daverobson08]

Yeah maybe for $60 it would be easier to just buy them! I'll gladly take a copy of the CAD files if that is okay DXF format is fine or anything really!

My trucks do have the brake mount holes, they are these ones:

I used the brake mounting hole to secure my motor mount.

Have you got the brakes on your front trucks? If so, how do you find that? I wonder what kind of servo would be able to handle the force requires to bring one of these boards to a stop?

 

[galp]

Oh you have mbs trucks. MBS brake kit fits all mbs trucks. Here are the cad files:
http://gal.pavlin.si/cad/

I have brakes on my front trucks. It is better on front trucks because tires don't slip and the braking distance from top speed to zero is much shorter. You will also need one big ass servo for moving that. I solved that problem by using brake handle mounted on pipe with thumb throttle from e-bike controller, so I don't have all that wireless mumbojumbo in other hand. You can see that on pictures above.

 

[LEVer]

Check this guy's brake, its hydraulic. The circle not only functions as a mount for the caliper, but also protects the disc from road debris.

 

[torqueboards]

Pretty nice. Beto's brakes on a servo are nice as well. I know there's a few people who have made use of mechanical brakes which is really smart. The ESC brakes work well but it's definitely not intended for our use. I might have to implement something later on.

 

[LEVer]

For smaller wheels, just buy skatebrake and connect it to a servo.

 

[daverobson08]

Oh you have mbs trucks. MBS brake kit fits all mbs trucks. Here are the cad files:
http://gal.pavlin.si/cad/

I have brakes on my front trucks. It is better on front trucks because tires don't slip and the braking distance from top speed to zero is much shorter. You will also need one big ass servo for moving that. I solved that problem by using brake handle mounted on pipe with thumb throttle from e-bike controller, so I don't have all that wireless mumbojumbo in other hand. You can see that on pictures above.

Thanks for that, much appreciated. I'll see how I get on with the Heli ESC and if it is too dangerous then I'll get some brakes made. It looks like beto_pty has had some luck with servos

 

[galp]

It is working. I was testing it yesterday until my tire blew out

Here is a video i made today. Testing if chain drive can hold maximum rpm.

[youtube]lUm1SU0t_6o[/youtube]

 

[made_in_the_alps_legacy]

Impressive! It looks to run well, loved the pink nipples too
What happened to your tyre, just weared?

 

[galp]

Not really. When i got the board 1 year ago all of the tires were already old. They looked like new on first sight but they had holes and cracks when pumped up. Apparently MBS or our Slovenian retailer (we have only one) kept it for 3 or 5 years somewhere in warehouse. I ordered new MBS roadie tires because i'm intending to ride mostly on roads.

Are roadies stronger compared to MBS T1 or T3?

 

[galp]

The board is finally working. Top speed is safe 40m/h. Range seem to be around 25km with 10s 10Ah lipo pack.

Here is a video:

[youtube]cSnlBPSwDUA[/youtube]

 

[LEVer]

Great build! I like how smooth the acceleration is. Your ESC is different from others so I'd like to ask:

1. I can't clearly see if your kicking before you start but, can you start from a standstill on flat or does it cog? How about starting from stop and going uphill?
2. I see you're using a stick transmitter, so you do not have neutral?...braking is done by putting throttle back to zero?
3. Are you still going to put the MBS brakes?

I'm looking for a reason to go brushless without the cogging issues. Your video may convince me.

 

[galp]

I don't have to kick on flat but i have to do it on hill.. i don't have electrical brakes, because esc support only on and off brake

I don't have any brakes atm. I'm going to have a thumb throttle on my mechanical brake lever once it's done.
Will post pictures so you can see what i have in mind.
I used a very high transmission ratio 8t/72t, so that is the reason for no cogging. I belive there won't be any cogging starting uphill when i add the second motor.

 

[LEVer]

Thats good to know. I also have a hunch your esc and the 10s may have something to do with it.

 

[galp]

This is my solution for throttle when using V-brakes on mountainboard. It is made with arm cortex m3 micro controller, which has plenty of processing power and standard thumb-throttle from Chinese ebike controller. I'm going to shrink the board size (the board you can see in the video is protoboard). RC servo uses same signal as rc ESC.

[youtube]h1wiu7wGSHU[/youtube]

It works pretty good, don't you think?

 

[axx]

hey galp,
this motor mount looks awesome, just like the trunk mount!!

where do you have those from ??

regards alex

 

[galp]

I machined it myself. I can send you cad files if you want.

 

[JackHMcD]

⏆⏆⏆⏆

 

[galp]

It's been a while since my last update. This is how my board looks today:

Full spec:
top speed: ~50km/h
average range: 20km
power: 5.4kW
batteries: 2x10S 5Ah

This is my charging station. iCharger and batteries on top of 28-52V 30A DC power supply.

 

[made_in_the_alps_legacy]

very impressed by your reduction ratio - motor sprocket teeth number... I see your motor reproduced itself : you get 2 now, is your ESC dual ?

 

[galp]

At first i had 1:9 (8/72) ratio, but it was too slow. Now i have 1:7.5 (8/60).

Nope my esc isn't dual. I have two of Turnigy dlux 80A (heli esc) without brakes. I have mechanical brakes on my front truck.