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Author Topic: Class Project: Need help trying to power wheels with Drill DC Motor  (Read 2579 times)

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Offline FirebotTopic starter

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For one of my classes we need to build a robot that can put out fires. My design involves using DC motors striped out of a variable speed drill to move wheels to power tracks. I have no clue how I can convert the high speed of the motor in to a lower speed with high torque to power one wheel at a time or is it even possible to use one motor to power two wheels on each side instead of 2 motors per side.
Thanks
« Last Edit: April 14, 2011, 06:52:43 PM by Firebot »

Offline rbtying

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Re: Class Project: Need help trying to power wheels with Drill DC Motor
« Reply #1 on: April 14, 2011, 08:34:09 PM »
You would use gears.  Or, in this case, try a sprocket and chain (you can run the chain around both wheel axis as well as the sprocket, and it's more forgiving if you don't machine to exactly the right size.)

Offline FirebotTopic starter

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Re: Class Project: Need help trying to power wheels with Drill DC Motor
« Reply #2 on: April 14, 2011, 08:47:59 PM »
What kind of gearing would I use? Would a worm gear be best you think?

Offline garrettg84

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Re: Class Project: Need help trying to power wheels with Drill DC Motor
« Reply #3 on: April 15, 2011, 06:48:58 AM »
Worm gears are great for gear reduction, however they aren't very efficient due to friction. One other pitfall or perk depending on your requirements - once you stop giving your drive shaft power, your axle/tires are LOCKED up. It creates for some jerky movements, but it is nice to have such a drive system if the bot will ever need to 'park' on an incline or decline. This jerkiness can be almost eliminated but ramping up and ramping down power to your motor. Smoothing it out will require a little more coding on your half though.

If I were presented with this issue, I would find the smallest bike sprocket I could find and a much larger sprocket and use a bike chain drive. I'm not sure if that is overkill for your project though or what your monetary restrictions are.

good luck!
-garrett

Offline waltr

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Re: Class Project: Need help trying to power wheels with Drill DC Motor
« Reply #4 on: April 15, 2011, 07:37:50 AM »
What happened to the gear reducer that was in the drill motor?

Offline garrettg84

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Re: Class Project: Need help trying to power wheels with Drill DC Motor
« Reply #5 on: April 15, 2011, 07:40:18 AM »
What happened to the gear reducer that was in the drill motor?

Excellent question. I had originally thought the same thing, but then assumed that was included in the equation and still moving too fast or not providing enough torque.
-garrett

Offline omkar

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