750 W Chain Puller; Fits Most Bikes (+Video)

[damonjackson_spl]

i just got some movement in the pants!!!!

[Ron Z]

Initial answers to questions.

Very nice work! I would love to see some video of this in action! So does the bottom bracket mount just float there, or is it rigidly mounted in some way?

It floats on ball bearings. Provide a rider (I'm 66), and a videographer on the east coast, and we'll talk.

Drool..... I'm not understanding why it looks like there are two sprockets on the planetary tough.

It's an optical illusion, probably due to reflections and the wide angle lens. There is only one freewheel. There is not room for two.

I was thinking that maybe so one could have a chain to the rear wheel?

Good eye. +1

Simply turn the motor gearbox system around (It's symetrical, only four screws), and drive the left side of the rear wheel. The freewheel has an insert that fits on the gearbox keyed shaft. So turn around the motor/gearbox, flip the freewheel on the shaft, and swap two wires on the motor phases, and you are in business. Probably would need a different gearbox ratio, lots of ratios available. The present gearbox full throttle output rpm is 300.

Lookin good Ron.

I never heard back when I asked about making more 3205s. I love the clean design.

Matt

More motors are coming! Sent you a pm.

Amazing! Do you wish to share the weight of a complete unit?

The system including the cranks and bottom bracket weighs approximately 11.5 lbs. Thats about 8 pounds added weight above a standard crank set, and bottom bracket.

Vision IPS freewheeling cranks are used (EVDeals)

Could you please provide a link? I cant find them on the EVdeals website.

Top work BTW!

I get them in quantity thru EVdeals. They are not on his website. I will call Scott at EVdeals, and will report back on this thread.

[Ypedal]

projected price ?..

[Ron Z]

I don't want to turn this thread into SPAM. Pm me and I will provide information as to availability of parts and pieces.

[neptronix]

Very very interesting...

[Whiplash]

Nice! So the brackets simply straddle the protruding portions of the bottom bracket pieces! Great idea!

[damonjackson_spl]

projected price ?..

PRICE?

[briangv99]

Very very nice work Ron, looking forward to seeing a video of the system in action.

Vision IPS freewheeling cranks are used (EVDeals)

Could you please provide a link? I cant find them on the EVdeals website.

Top work BTW!

Boost I bought mine here http://www.hostelshoppe.com/cgi-bin/rea ... 1098307215

you'll need the stoker set. They come with a Shimano FW, I've changed mine over to use a white Eno.

[amberwolf]

I don't want to turn this thread into SPAM. Pm me and I will provide information as to availability of parts and pieces.

I don't think it would be considered spam, since people are *asking* for this info.

[spinningmagnets]

Mounting a BB drive off the BB-cartridge (instead of the downtube) is a brilliant idea. Other BB-drives had cumbersome attachments that had issues with mount-rotation on the round tubing when under load, and adaptation difficulties due to the variety of downtubes styles (some of which do not have a round cross-section).

The motor needs a splashed-mud cover, but theres a lot to really like about every part of this!

http://www.acpd.co.uk/planetary-gearbox-sectional-drawing.html#e1023387

[Miles]

http://www.acpd.co.uk/cgi-bin/site-edit ... eid=816370
Yikes! £470 ($775), incl. VAT, for the gearbox

[Ron Z]

I apologize for the SPAM post. It was late, I was tired, and frankly overwhelmed by the response.

The projected price for the complete system is $1700. I am working to reduce that. This includes a complete system, ready to bolt on and go. The only other requirement is a bottom bracket removal tool, and electonics.

I also plan to make the mounting system, modified crank set, and modified bottom bracket available for custom motor/reduction systems. The projected price $600.

I have complete parts for 5 systems. More are on order.

Comments appreciated.

[boostjuice]

Vision IPS freewheeling cranks are used (EVDeals)

Could you please provide a link? I cant find them on the EVdeals website.

Top work BTW!

Boost I bought mine here http://www.hostelshoppe.com/cgi-bin/rea ... 1098307215

you'll need the stoker set. They come with a Shimano FW, I've changed mine over to use a white Eno.

Thanks Brian. I was aware of that. Just fishing for a better price is all

[bigmoose]

Here is a link to patent 5964472 that was engraved on the sprocket for info:
http://www.freepatentsonline.com/5964472.pdf

[Whiplash]

I apologize for the SPAM post. It was late, I was tired, and frankly overwhelmed by the response.

The projected price for the complete system is $1700. I am working to reduce that. This includes a complete system, ready to bolt on and go. The only other requirement is a bottom bracket removal tool, and electonics.

I also plan to make the mounting system, modified crank set, and modified bottom bracket available for custom motor/reduction systems. The projected price $600.

I have complete parts for 5 systems. More are on order.

Comments appreciated.

OK so you need a controller, batteries, charger, throttle, Etc. after the $1700.00? So... around $2500.00 total? VERY nice design. I like it!

[Warren]

Ron,

"Primary drive is thru half link chain, for the small free wheel, and quietness"

How does the half link chain help anything? It is still 1/2" pitch. And the bent side plates tend to straighten out, making for a weaker chain. The value of half links, is they allow you to hook an "inny" to an "outty."

I work in a bike shop. The half link chains are sold to BMX kids 'cause they look cool. But they stretch them really quickly.

[spinningmagnets]

I don't see any chain tension adjustment. I can visualize adding shims between the where the motor mounts and the main housing. Half-link may allow for less shimming to get an acceptable tension.

I'm sure you are correct about BMX kids stretching half-link chain, but not all half-link chains are created equal in quality and strength. With the half-link chain located in the primary drive position instead of at the final drive to the wheel, I believe it will probably work out well enough. Either way, field testing will soon sort out where changes and upgrades are needed.

[Ypedal]

I"m running half link chain on my 3rd and 4th stages of my RC bike, with an astroflight 3210 and HV110 on 48v.. so far so good.. I had to go with it because regular links would not give me the adjustments i needed...

[Warren]

" I had to go with it because regular links would not give me the adjustments i needed"

Regular chain allows adjustment in 1" increments. A single half link will allow you to adjust in a 1/2" increment. A whole chain of half links adds no benefit. It will always be heavier, and weaker, than a comparable straight chain.

[RWP]

This is one very sweet setup.
Love the clean design. You have a winner.

Roy

[Ron Z]

The primary reason for using half-link chain is to facilitate primary chain tension adjustment, and to eliminate the need for a chain tensioner. Only a 1/4 inch adjustment is necessary. I use KHE chain, which has a cut-away on each link. I believe this eliminates the slapping of the chain sides on the small 13 tooth freewheel. I may be wrong.

There is no need for shims when adjusting primary chain tension. The silver cap screws go thru the inner mounting plate (the one closest to the BB), and are threaded into the outer plate. The black cap screws are threaded into the inner plate and press against the outer plate, they set spacing. The procedure is: Loosen the four silver cap screws. Adjust the four black cap screws for chain tension and plate alignment. Tighten the four silver cap screws. Done.





I have four systems nearly complete (short two small parts). Next systems late June early July (motors). Check the Items for Sale - New topic for introductory pricing (lower). The item should appear next week.

[kfong]

Nice simple way to adust the chain. Great design. The parts look anodized?

[comradegerry]

What a great setup, clean, functional and compact, brilliant. best of luck with your continued product development, it really is looking great.

Gerard

[Miles]

Ron,

Please could you give us the exact weight of the 3205?

Thanks.

[Ron Z]

The weight of the 3205 motor with 6 inches leads that are terminated with CC 5.5mm male bullet connectors is 688 grams or 1.51 lbs.

The total drive system mechanics, including primary chain, but not including crank chain wheel, is 3181 grams or 7.0 lbs.