Finalized! - Longboard Alien Drive Systems - single C6374

[drmacgyver]

Nice build and awesome vids! Do you always ride with helmet? I am trying to decide whether I want one or not. I ride slow at 12mph, but even falling at that speed can be dangerous. I fear the helmet will be uncomfortable and will look akward (an adult going by very slow while wearing full protection gear )
Whats your expierence wearing protection gear?

MotorX helmets looks awesome and you'll never feel safer in one. Just took apart some headphones and built them into the ear wells = built in stereo! And if people tried our boards for themselves at the speeds we can go, they'd think twice about laughing at the idea of wearing a helmet. Hit your head in the right (or wrong) spot and that could be your last time riding. Next I need wrist guards. A broken wrist is one of the worst things to break.

 

[beetbocks]

You must always wear a helmet..think about this..if you walk into a door at walking pace..it bloody hurts..and that's at say 3mph..so at 15mph..it's going to injure you..and at 25mph.... If your more bothered what people think than your own health.........
get a nice looking helmet and I've also got some headphone in the ear muffs..

 

[yizhang]

I am a new guy...

Just want to ask a question. Turnigy motor doesn't seem to have a keyway. How should I connect it to my cog?

 

[psychotiller]

I am a new guy...

Just want to ask a question. Turnigy motor doesn't seem to have a keyway. How should I connect it to my cog?

Use a grinder to cut a keyway.

 

[666yeti666]

indeed, please see the pictures in this post : http://endless-sphere.com/forums/viewtopic.php?f=35&t=56568#p846433

 

[yizhang]

Thank you!!!

 

[666yeti666]

After my last ride I noticed that my keyway proned out more and more, so obviously it does not stick into the slot properly. Now how to fix it ?
I'm thinking about using very thin copper stroke and press it in together with the keyway. On the other hand, it's still required to get the pinion off the axle eg. during a repair and I don't know if that's still possible when locking it with copper sheet....

Anybody has any other idea ??

Maybe drilling a hole in the middle of the 10mm axle and adding a m3 bolt including a ring ....

 

[beetbocks]

I have drilled and tapped another m3 hole exactly opposite the first grub and the two together seem to hold it better

 

[666yeti666]

I have drilled and tapped another m3 hole exactly opposite the first grub and the two together seem to hold it better

Aha, so that grubscrew presses onto the keyway ?

 

[beetbocks]

Yes. From both sides then

 

[yizhang]

Do i need some extension wires to connect the motor and ESC? If so, could you tell me what size of wires i need?

thank you!

 

[beetbocks]

12awg for a 50mm and 10awg for 63mn

 

[666yeti666]

Yes. From both sides then

Thanks, then I will check if there's enough "flesh" on that point on the pinion to drill a hole and to make 3mm thread for a grubscrew. I'm a little worried since the slot in the motor axle at the end is not exactly 90degrees to the bottom of the slot, which could cause that the keyway is "pushed out" , if you know what I mean...

If that's the case I will drill a hole in the center of the motor axle and will apply a ring.

 

[beetbocks]

I wouldn't drill through the shaft ...weaken it .
Just put the grub screw at 45deg .. You just need to put pressure on from more than one side ..

 

[666yeti666]

I wouldn't drill through the shaft ...weaken it .

I doubt that, if it's only 5mm deep

 

[666yeti666]

ok, so I wanted to drill a hole into the 10mm motor axle, but unfortunately .... the shaft is hardened so impossible .... I could have known this of course...

Anyway, so drilled a hole into the pinion just where the keyway is positioned. There was not a lot of "flesh" but just enough for the M3 grubscrew. Now the keyway seems to hold fine, but let's keep an eye on it after some rides.

 

[beetbocks]

I thought you meant all the way through the shaft but yeah they are hardened and ground anyway.
If that doesn't hold .Another good place to put the grub is inside one of the teeth .. I do this on my 12t pulleys due to limited Space when fitting .. You just need to make sure it's screwed in below the tooth or the belt will foul .

 

[666yeti666]

Hi All,
some time ago already .... anyway,
Today I read the announcement that Enertion boards has some very nice 5”x1.5” pneumatic wheels (428grams, 32U$), that fit standard skateboard axle. They even sell a one that includes the 64T alu pulley (72U$) => http://www.enertionboards.com/electric-skateboard-parts/all-terrain-5-inch-wheel-assembly/

Of course they don’t go cheap, for a single drive board it would come on a total of 168U$ (exlc. shipping) but I think the larger wheels are nice way to drive also during autumn, when there’s lots of leafs and small branches on the roads.

Furthermore I would expect a much more comfortable ride with less “numb feeling feet”. Anybody has some experience with pneumatic tyres that can confirm this ??
Also, the wheelbearings will be happy for this and live longer.

My current wheels are ABEC11 83mm Flywheels (78a), so this would mean an increase in diameter of 5*2.54 – 8.3 = 4.4cm. The riding height increase is 2.2cm.
Will this height increase lead to less stability in corners ?

The downside is that I need another board with more clearance and the fact that it will be heavier in total.
Another thing is the drop in speed to to the larger pulley. In my case it would go from 32T to 64T that will cut my topspeed in half …. (with my 15T motorpulley from about 26 to 13 km/h…) to overcome this I would need a larger motorpulley, but cannot increase it with the same ratio, due to the larger wheel it would draw too much current during driving off…

And of course the other question: is there a cheaper alternative …

Regards
Sebastien

 

[666yeti666]

regarding the speed: I forgot the larger wheel diameter of course.
So with a wheeldiameter of 5” = 127mm, this would lead to a topspeed of 19km/h . In order to compensate for this I would need to increase the motorpulley from 15T to 19T to get the same topspeed as before (~26 km/h.)
The ratio would then be 64/19 = 3.36, so nice to compensate for the bigger wheelsize and the higher torque required. (original is 32/15=2.1)

The other questions are still valid of course ....

regards
Sebastien

 

[furp]

I am using 5 inch skike wheels but they had to be modified which costs more and end up with a lesser quality wheel compared to enertion ones if you can't do the latheing by yourself. Also, the enertion wheels are offset a little, so you need less clearance for them than modded skike wheels. If I was to do it again, I'd go with enertion ones. Having the option to add a perfectly centered and matched pulley right away is invaluable, too.

From my experience, the ride feels waaay more smooth with pneumatic wheels on most surfaces but the most smooth ones of course. You might not want go back to skate wheels afterwards

As for stability, I think it mostly matters how many risers you have between the axle and the board. The higher the board is above the axles, the more instable it could get (i think). At least I have not experienced any problems with my pneumatic board without risers.

Go for it!

 

[666yeti666]

That’s the comments I hoped for !
So now I need to check for a 19T / 5mm motorpulley with an inside diameter of 10mm preferable with keyway …. mmm …. expect that to be the biggest challenge….

Regarding the riser pads, mine are now 10mm thick, needed for clearance of the wheels and at least some dampening. When I have the proper board that may even go down to zero, no need for risers. Or maybe even better by going to a dropdown board (I was searching for a longer one than my 36” anyway ).
Any suggestions for any basic stiff downhill dropdown board ~ 40” ….

Thanks
Sebastien

 

[furp]

I dont know if this an option for you, but beltingonline.com has almost everything and options for machining as well. If they dont offer it by default, maybe ask them about it. The alien drive pulley come from them as well and got keyways I think.

 

[666yeti666]

thx, I've had a quick look and indeed they seem to have it, however the width is not so clear.
The Enertion pulley seems 9mm wide, so I need the same width for the motorpulley as well. Next to that I have to check for the clearance between that larger motorpulley and board.

what kind of board do you have ? any pics ?

thx
Sebastien

 

[666yeti666]

In the meantime I got the very helpfull link from Peter to determine pulley diameter and distance : https://sdp-si.com/eStore/CenterDistanceDesigner

The diameter of the required 19T motorpulley would be 30.2mm which of course is no problemsince it is much smaller than the motordiameter.

The diameter of the 64T pulley on the wheel equals 101.8mm (which is larger then my current wheelsize of 83mm !).
Next thing is to determine distance between the pulleys, to see the length of the pulley needed. I have to be carefull since I still want to have the possibility to change gear tension, so need some play still.

The other thing to consider with the big 5"wheels is wheelbite. They probably wil not fit my current board, so I already checked for another (at least 40" long and preferrable 10" wide) board a so called twin tip that gives the most clearance at both sides. If any of you have any ideas of a suitable board, not to expensive board, please let me know (blank board is no problem).

I've read that Richard (alien drive systems) already placed an order for those big wheels so I will follow his experiences as well ...

thx
Sebastien
ps. by coincidence I saw this board, which is very nice for a more snowboard feel ride : http://www.streetboardz.net/eu/page.php?page_id=1

 

[beetbocks]

Hi
I have already used 5" pneumatic wheels/tyres on a longboard and you have to have some serious wheel wells to stop wheel bite..
http://endless-sphere.com/forums/viewtopic.php?f=35&t=55843

I used a Holey double D deck from Surrey skateboard which i still had to cut away with a jigsaw to stop wheel bite..but this deck also has a nice 3/4 " drop deck which lowers the platform nicely with the larger wheels...
I actually used a 60T wheel pulley with a 14T motor pulley and its perfect gearing IMO ..
In order to use the drop deck i actually made some special angle motor plates ..and i will be making a kit available for use with the 5" Enertion wheel and tyre including a light weight 60T pulley to fit the enertion wheel..and belt,motor pulley etc..
This will be a dual drive kit for use with 50mm motors as i don't think a single motor will cope with the extra power and torque required to turn these pneumatic tyre . The pneumatic tyre has a far higher rolling resistance than the skate wheel and range is significantly decreased with this wheel..I'm hoping the wider enertion wheel will improve this..
Having said all that the pneumatic wheel is far superior for everyday use in all terrains ..so a drop in range is small price to pay..