pre-made mid hub mounting hardware

[parajared]

Is there anywhere that is selling pre-made mid hub mounting hardware.

If not, how are you guys building your mounts? I want to build a stokemonkey setup using a MAC motor.

I have access to a welder and angle grinder.

 

[cal3thousand]

Is there anywhere that is selling pre-made mid hub mounting hardware.

If not, how are you guys building your mounts? I want to build a stokemonkey setup using a MAC motor.

Only thing I know if is full kits like the stokemonkey or the urban commuter.

But, if you can do some of your own work, there's a new midmotor conversion by crossbreak that a few members have had success with. I'm in the process of converting my MAC for this purpose.

http://www.endless-sphere.com/forums/viewtopic.php?f=28&t=45245

 

[parajared]

But, if you can do some of your own work, there's a new midmotor conversion by crossbreak that a few members have had success with. I'm in the process of converting my MAC for this purpose.

http://www.endless-sphere.com/forums/viewtopic.php?f=28&t=45245

I tend to end up messing things up when I get overly ambitious with my mods and this looks pretty ambitious.
I think I am willing to sacrifice having a few extra teeth on a sprocket for the benefit of simplicity and ease of swapping out a motor if I end up burning it up.

Thank you for the link though. He has a pretty neat looking project.

 

[Warren]

parajared,

I made mine from 4" (100mm) aluminum angle, and 1/4" (6 mm) aluminum plate. A drill press was very handy, but the rest was done with a vise, hacksaw and files.

 

[parajared]

Nice,
Do you use torque arms or just the alunimum enough?

 

[cal3thousand]

Nice,
Do you use torque arms or just the alunimum enough?

Just design your plate thick enough with a pinching mechanism. I think that max torque is reduced in midmotor use, so it's not quite like a hubmotor stress. Also, you aren't resting the weight of the bike on the axle like in a hubmotor and no regen.

 

[spinningmagnets]

I'd say that my past projects have shown that quite a bit can be accomplished by a vice, a hacksaw, and a drill. But...recently I have been fascinated and very excited about water-jetting/laser-cutting. You simply draw something on a screen, paypal them, and a complex part is FedEx'd to your door.

The large aluminum channel with thick walls is available from onlinemetals.com
http://www.onlinemetals.com/merchant.cfm?id=64&step=2&top_cat=0

The steel part to the left was water-jetted by "big blue saw" and the big aluminum plate was cut by me using a jigsaw and about 7 blades.
http://www.bigbluesaw.com/

 

[cal3thousand]

I'd say that my past projects have shown that quite a bit can be accomplished by a vice, a hacksaw, and a drill. But...recently I have been fascinated and very excited about water-jetting/laser-cutting. You simply draw something on a screen, paypal them, and a complex part is FedEx'd to your door.

Would you mind posting the general cost incurred?

 

[spinningmagnets]

The steel part in the pic is roughly $30 for two of them, if you order a minimum of 10. On one side the edge was sharp enough that it needed to be de-burred with a file, but other than that, I would do it again without hesitation. I don't remember the cost of just two parts, but it was noticeably more expensive.

Aluminum is easy enough to cut and drill that I can make those parts myself. I can cut and drill steel, but it is harder and slower. Aluminum goes pretty fast.

 

[parajared]

I have been thinking about the way I want to build this and I am considering cutting the tail end off a thrift store BMX (which usually can be had for around $15). I will put the hub motor in the dropouts.

I speculate the best and easiest way to anchor the chopped BMX tail would to be to weld the thing right to my bike frame, though there may be a less permenant way to acheive this.

 

[justlooking]

subscribed

 

[crossbreak]

But, if you can do some of your own work, there's a new midmotor conversion by crossbreak that a few members have had success with. I'm in the process of converting my MAC for this purpose.

http://www.endless-sphere.com/forums/viewtopic.php?f=28&t=45245

I tend to end up messing things up when I get overly ambitious with my mods and this looks pretty ambitious.
I think I am willing to sacrifice having a few extra teeth on a sprocket for the benefit of simplicity and ease of swapping out a motor if I end up burning it up.

Thank you for the link though. He has a pretty neat looking project.

The trick of this conversion is that cooling is highly increased, stock MACs burn quite quickly. So it is very unlikely you burn a converted motor if you dont push in several kilowatts, it's not just the added torque/simplicity in mounting/possibility to use smaller sprockets, which make a conversion worth to think about. Anyway, good luck with your build

 

[parajared]

Your build looks pretty neat Crossbreak. That looks like the way mid-drives should be built to me; small gears and impressive heat shed. Your crossbreak BPM build will shed heat faster than a BPM/stokemonkey configuration for sure.
I think my endless-sphereness is wearing off Cross! I have been going on 100 watt rides on my trike and 5ah battery and liking it. I am even considering a 22 volt 500 watt setup for off-roading. I just have such beastly strong legs from all my recent biking adventures I just don’t need all that electrical power.

I came across Gwhy's thread showing off his BMX stem jackshaft and I thought it would be pretty neat to use two bmx stems plus some scrap steel to make a hub motor mount.
http://www.endless-sphere.com/forums/viewtopic.php?f=28&t=22245&start=0

 

[parajared]

"Big Roc" stems can be had for a mere $13 at amazon.com. Might make nice candidate.
http://www.amazon.com/Adjustable-Handlebar-31-8mm-25-4mm-Adapter/dp/B009NH8HEM/ref=sr_1_223?ie=UTF8&qid=1378420398&sr=8-223&keywords=handlebar+stem

 

[parajared]

Big Roc Stems turn out to be a bust. The shafts that I could anchor to on my the bike are 2" and 1 and 1/2".
Here is a picture of what I am trying to mount to:

I am now considering muffler clamps and pipe repair clamps. There has to be a cheap, easy way to mount a mid-hub.