Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Electric Bikes Here's a place to discuss ebikes, from home grown to high-tech.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 06-13-12, 06:31 PM   #1
menthe
Newbie
Thread Starter
 
Join Date: May 2012
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Impact Driving

New guy with no mechanical experience and no DIY experience hopping into the forum to ask this:
All mentions of cheap DIY electric bikes have said to use a power drill as your motor, which makes sense.
But there's a very similar power tool that is much more powerful while still using roughly the same amount of energy: Impact Drivers.
http://www.youtube.com/watch?v=0URLLgMS5RU
Why not use one of those as your motive force? What damage could it do? Is there some mechanical reason that it simply would not work anywhere near as efficiently?

If you just read the above and wondered "Is this guy ********", don't worry, that's the sort reaction I usually get. Just try to get past it and assume I just don't know any better. Be elitists.

Last edited by menthe; 06-13-12 at 08:43 PM.
menthe is offline   Reply With Quote
Old 06-14-12, 04:52 AM   #2
BobV13
Member
 
BobV13's Avatar
 
Join Date: Apr 2012
Location: Westminster Maryland
Bikes: FUJI
Posts: 29
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
No, you don't want to use an impact driver. An impact driver does what is say "Impacts". Not all of the force goes into the rotation of the head of the drill, a portion of the force impacts or hammers.
BobV13 is offline   Reply With Quote
Old 06-14-12, 10:51 AM   #3
Ypedal 
Senior Member
 
Ypedal's Avatar
 
Join Date: Oct 2008
Location: Moncton, NB, Canada
Bikes:
Posts: 113
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
exactly what he said.

using power tools to drive a bike is generally a bad idea for many reasons.. efficiency being one major factor... 2nd is limited power.. 3rd is range ( a power tool pack would only deliver a couple kms per charge , if that ) and would not last very long as they are meant for low duty cycle vs ebikes that require constant duty ..

possible yes.. not practicle.
Ypedal is offline   Reply With Quote
Old 06-14-12, 11:40 AM   #4
menthe
Newbie
Thread Starter
 
Join Date: May 2012
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by BobV13 View Post
No, you don't want to use an impact driver. An impact driver does what is say "Impacts". Not all of the force goes into the rotation of the head of the drill, a portion of the force impacts or hammers.
Right, my mistake. It turns out that there are impact DRIVERS, and then there are impact DRILLS. I did not know about this until now.
So what about impact drills, not impact drivers?
menthe is offline   Reply With Quote
Old 06-14-12, 12:15 PM   #5
sdold
Hi, folks
 
sdold's Avatar
 
Join Date: Jul 2006
Location: Northern CA
Bikes:
Posts: 152
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I think the impact drills give intermittent higher torque using a hammering effect, not more power. If I were building something like this I'd want steady torque and a motor with good bearings made to run continuously.
sdold is offline   Reply With Quote
Old 06-14-12, 12:20 PM   #6
Ypedal 
Senior Member
 
Ypedal's Avatar
 
Join Date: Oct 2008
Location: Moncton, NB, Canada
Bikes:
Posts: 113
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
both do the same thing.

difference is in the chuck. the " drill " has a 3 jar adjustable chuck... the driver has a magnetized octogon bit with a locking chuck and you canot put a dill bit into one of those.
Ypedal is offline   Reply With Quote
Old 06-22-12, 11:45 PM   #7
menthe
Newbie
Thread Starter
 
Join Date: May 2012
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for the education, guys.

Consider this this thread topic 'solved', in spite of there being no method to note it as such.
menthe is offline   Reply With Quote
Old 06-23-12, 07:25 PM   #8
Canada Panda
Member
 
Canada Panda's Avatar
 
Join Date: Jun 2012
Location: Orillia, Ontario
Bikes: 1985 SuperCycle Commuter Six
Posts: 39
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The impact mechanism is separate from the motor so this is irrelevant. However, it's been my experience that impact tools have motors meant for short bursts of power (driving screws into wood or loosening rusted bolts) - my impact drill overheats much faster than my regular drill when used continuously. If you absolutely want to try a power tool e-bike, then my best candidates are motors from a rotary hammer drill or a mixing drill - both are designed for high torque under continuous use. There are better alternatives in DC motors though if you visit an industrial supply shop or possibly even a well-stocked hobby shop.
Canada Panda is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 07:47 AM.