[Caevlist] Electric chainsaw for E-bike project?

[Kirk@SHIFTev.com]

Hi Alan,
The high V bennies vs mechanical reduction losses of high RPM reduction are a common argument in high efficiency Electrathon competition vehicles. I'd enjoy exploring this with you. I ran a friction drive in 1999 and placed 8th at the Pentad Nationals on a velodrome in San Diego... after a flat tire & repair! I think it can be done in the right conditions.-Kirk

*Sent via phone. Please forgive voice recognition errors.

-------- Original message --------
From: gburket at peak.org 
Date: 7/14/2016  7:21 PM  (GMT-08:00) 
To: Alan Dennis <alan at curiousexistence.com> 
Cc: Corvallis EV CLub <caevlist at caevclub.org> 
Subject: Re: [Caevlist] Electric chainsaw for E-bike project? 

Unfortunately motors like this in a bicycle application require complicated, multi-step reduction units. Something like this: http://www.recumbents.com/wisil/shumaker/ , which borders on being a CNC labour intensive work of art!

----- Original Message -----
From: "Alan Dennis" <alan at curiousexistence.com>
To: "Corvallis EV CLub" <caevlist at caevclub.org>
Sent: Thursday, July 14, 2016 3:33:37 PM
Subject: [Caevlist] Electric chainsaw for E-bike project?



Hi Corvallis EV Clubbers, 



I’m thinking of repurposing an electric chainsaw to give my bicycle a boost while pedaling up a steep hill. 



I already have a couple of 40V Ryobi batteries (~95 Whr with internal BMS) that I use in my lawnmower and rototiller. Someone has torn apart a Ryobi Chainsaw and battery pack and documented all the components and how they could be used to build a go-kart. The following image is taken from that page: 







The part I’m struggling with is the mechanical engineering. Here are the issues that I’m anticipating: 



1. It will need a gearbox to reduce the motor speed to something usable. The motor shaft is “12mm diameter with 10mm flats”. 

2. How should I interface the gearbox from #1 with a bike chain? 

3. How will I keep everything waterproof? 



Is anyone willing to lend me their experience, even if it’s just to say “don’t bother”? 



Thanks, 

Alan Dennis 

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