So I've Got This Mountain Bike..

[Metallover]

I have a 26" Mongoose mountain bike. I think it might be a good canidate for a conversion. It has front and rear disc brakes and full suspension; 4 link in the rear. I could mount a sprocket to the disc brake mount in the back.

I want to use the planetary gearbox from bane bots made for the CIM motor. Has anyone successfully used one before? I could get a new 12:1 gearbox or I am talking to a guy about a 16:1 used box..

For electronics, I think 8s lipo, CC Pheonix Ice 100, and an outrunner. I've got a few choices.

HXT 80-85-B 170kv [or 250kv] - http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idproduct=5141
HXT 63-74 200kv - http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idproduct=3890
TGY 63-64 230Kv - http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=7710&Product_Name=TGY_AerodriveXp_SK_Series_63-64_230Kv_/_3150W
TGY 63-74 170Kv - http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=7870&Product_Name=TGY_AerodriveXp_SK_Series_63-74_170Kv_/_3250W

I want low 30s for speed and a range of at least 12-15mi. I'll run 10ah 8s 20c Turnigys.

Everything sound do-able?

 

[12p3phPMDC]

I have not used one of these planetaries...
but whatever you do, I would try to make sure
you are loading the output shaft correctly...

It may require an additional support bearing if you put
sprocket load on the shaft...as the output bearing
may not be designed for that kind of loading.

I like the idea of reducing the motor speed immediately
through a planetary... It would make it easy
to do a direct drive..

 

[Grinhill]

Now the hard part...where do you think is the best spot for the motor/gearbox?

Somewhere on the rear suspension? Would it hang out the side, or maybe in front of the wheel?

 

[Metallover]

Only place I could think to mount the stuff is where conventional brakes would go in the rear. Right above the 4-link bars. They move a little with the suspension so I would probably need to make a tensioner thing.. Seems like 8s will give me the performance I'm looking for?

 

[lesdit]

Do you intend to do mostly offroad, or just buzz around on the pavement with low duty cycle on the drive ? It will make a big difference in your approach.
I like the planetary design idea. Look up 'cyclone' kits, they use a brushless motor with a planetary reduction slapped on the front.
There is a thread here somewhere where the guy had bad luck with the cyclone planet gears wearing down after only a few miles, something to
worry about if the box you choose is not chock full of bearings where they should be...

I have an industrial 16:1 planetary box, very well built, full of needle bearings, but it weighs a ton, too bad. :|

 

[Metallover]

I plan to just ride around on pavement. But... You know after I get something up and running I might tackle some new fronteirs.

 

[Timma2500]

[/attachment]

Hey Metallover, i'm using a Banebot 16:1 gearbox for my build. Havnt run it yet so cant say how it goes for noise or reliability. They seem well built for the price though. It will certainly be tested with the Astro 8150 driving it. Am also going to test the Exceed RC 245kv 63-64 2700w in the pic. The small pulley in the pic wont be used due to no side plates. The output of the 'box is an Eno 22t freewheel on an adapter provided by Matt (recumbance).

Yeah i'll be using an outboard bearing on the motor pulley, outboard gearbox output, outbard gearbox input and an extra bearing inboard on the input shaft as i just happen to have a bearing to fit and i figure the more support there the better for a total of 3 bearings on the input shaft. Hope this helps!

Paul

 

[Metallover]

Thanks for the info! Just what I've been looking for.

I just need some clairification on the box. It takes an 8mm keyed shaft, right? Like this?

And if I get a motor with a 10mm shaft, could I put the motor in a vice, run the motor, and sand down the shaft with a file/sandpaper? Then cut the key with a dremel? Don't have much machining recources here..

 

[dontsendbubbamail]

Paul
You got a build thread going somewhere? I want to hear how the Banebot works out and to see what you are carving out of all of that aluminum.

Bubba

 

[12p3phPMDC]

And if I get a motor with a 10mm shaft, could I put the motor in a vice, run the motor, and sand down the shaft with a file/sandpaper? Then cut the key with a dremel? Don't have much machining recources here..

Do they have a machine shop at your school?

If they do, I would go talk to the shop teacher and tell them what you want to do.

You'll have a hard time removing 2mm of material that way. A coarse mill file would probably work.
It'll be really hard if the shaft is hardened. If the shaft is hardened, you'll have to use a grinding operation.
You may also be able to cut the keyway with a carbide bit on a dremel...
It won't be pretty or easy though...

 

[spinningmagnets]

"...won't be pretty or easy though..." sounds like my Prom date back in '77. (Ba-dum BUM!)

 

[12p3phPMDC]

:lol:

Maybe MetalOver can pull a Methods and pick up his prom date
on his eBike....

 

[Metallover]

I'd like to hear that story. :lol:

 

[12p3phPMDC]

Check the 18 fet instant start board thread under ebike technical.

 

[Doctorbass]

I have a 26" Mongoose mountain bike. I think it might be a good canidate for a conversion. It has front and rear disc brakes and full suspension; 4 link in the rear. I could mount a sprocket to the disc brake mount in the back.

I want to use the planetary gearbox from bane bots made for the CIM motor. Has anyone successfully used one before? I could get a new 12:1 gearbox or I am talking to a guy about a 16:1 used box..

For electronics, I think 8s lipo, CC Pheonix Ice 100, and an outrunner. I've got a few choices.

HXT 80-85-B 170kv [or 250kv] - http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idproduct=5141
HXT 63-74 200kv - http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idproduct=3890
TGY 63-64 230Kv - http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=7710&Product_Name=TGY_AerodriveXp_SK_Series_63-64_230Kv_/_3150W
TGY 63-74 170Kv - http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=7870&Product_Name=TGY_AerodriveXp_SK_Series_63-74_170Kv_/_3250W

I want low 30s for speed and a range of at least 12-15mi. I'll run 10ah 8s 20c Turnigys.

Everything sound do-able?

Yes.. Watta great candidate!

Enough room for 2.3kWh of LiMn battery! :wink:

 

[Timma2500]

Thanks for the info! Just what I've been looking for.

I just need some clairification on the box. It takes an 8mm keyed shaft, right? Like this?

And if I get a motor with a 10mm shaft, could I put the motor in a vice, run the motor, and sand down the shaft with a file/sandpaper? Then cut the key with a dremel? Don't have much machining recources here..

Yep, 8mm dia input shaft with a 2mm keyway. I'm going to get a mate to machine up a shaft to suit but i wont see him for atleast a month yet so that part of the project is on hold for now...

I'm with you on the lack of machining, a lathe would be sooo handy with these bike projects! I have never tried using a file and spinning shaft but it could be doable... the fine metal particles could get althrough the motor which the bearings may not appreciate... but if all else fails.

Paul

 

[Timma2500]

Paul
You got a build thread going somewhere? I want to hear how the Banebot works out and to see what you are carving out of all of that aluminum.

Bubba

Hey Bubba, yeah i'm about to do up a build thread either tonight or tomorrow. Just welded the frame today so am having a play!

Paul