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Power assited dolly

Could someone recommend a dc motor strong enough but @ the same time gentle enough to be used for power assist. The item will be a custom built dolly used for lugging around camera equipment. The total weight will be approx. 50 - 75 lbs. Thank you to those that help.

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169
Kiteman says: Jul 18, 2012. 9:44 AM
Something from an electric wheelchair or disability buggy?
2
sofiadragon1979 (author) in reply to KitemanJul 18, 2012. 10:17 AM
I was thinking more of something from an electronics store 'cause I'm building this thing from scratch.
13
steveastrouk in reply to sofiadragon1979Jul 18, 2012. 2:02 PM
Electronics stores won't sell motors like you need. You could try a windshield wiper motor
2
sofiadragon1979 (author) in reply to steveastroukJul 18, 2012. 2:13 PM
So I really will need a heavy duty motor, I was hoping that I'd be able to avoid that, but, I want this to be a high quality project. Ok that's out of the way.

Don't wiper motors work in a oscolation motion or is that an eccentric attachment? I'm automotive inclined but not to that point lol.
13
steveastrouk in reply to sofiadragon1979Jul 18, 2012. 2:51 PM
No, the eccentric is arranged outside the motor.
Are you always running on the flat, or do you want to (try) pull up hill ?

How fast do you want to move ?
2
sofiadragon1979 (author) in reply to steveastroukJul 18, 2012. 3:39 PM
It's going to be used on both hills & flat surfaces. The pace will be just about normal walking pace. Basically it is just going to be taking up the slack so I can tote everything around easier. I have a really bad back & a worse leg, so carrying this stuff isn't an option.
13
steveastrouk in reply to sofiadragon1979Jul 18, 2012. 11:39 PM
You're really going to need some torque then.
2
crapflinger in reply to sofiadragon1979Jul 18, 2012. 10:29 AM
die grinder? electric chain saw? starter motor? belt sander? most of those don't really have the torque (save the starter motor) to start a loaded dolly from a dead stop, but they would definitely reduce the amount of pull required to get the thing moving.

for all of those you'd have to develop some kind of gearing, a battery pack, and a speed controller though.

if you did as the man of kites suggests and get a junk electric wheelchair or like a rascal scooter or something, you'd already have the drive train, power source, speed control, etc..  check around on craigs list i bet you'd be suprised at how cheap you can find some of the components.
2
sofiadragon1979 (author) in reply to crapflingerJul 18, 2012. 3:42 PM
The first parts that you mentioned I had no intention of using 'cause they don't have the torque as you stated.
169
Kiteman in reply to crapflingerJul 18, 2012. 10:55 AM
Yes - there's "from scratch" and there's "from a sensible starting point".

The final item has no need to end up looking like the donor vehicle.
135
caitlinsdad says: Jul 18, 2012. 2:55 PM
If you want something like those pallet lift assist dollies, maybe make a version of this http://makeshopshow.com/2012/05/14/drill-powered-skateboard/ You might want to get a flex drill shaft or metal rod to extend a drivewheel so the drill is at handheld height.
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