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### Author Topic: DC motor  (Read 1642 times)

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#### yifei87

• Jr. Member
• Posts: 9
##### DC motor
« on: September 01, 2008, 06:22:48 AM »
hey,guys,
i would like to find a small DC motor, fast response, high strength and precise to fix my robotic hand project?
any recommendation? thanks for help.

#### airman00

• Contest Winner
• Supreme Robot
• Posts: 3,653
• narobo.com
##### Re: DC motor
« Reply #1 on: September 01, 2008, 06:33:47 AM »
use a servo

Check out the Roboduino, Arduino-compatible board!

www.Narobo.com

• Supreme Robot
• Posts: 11,663
##### Re: DC motor
« Reply #2 on: September 01, 2008, 01:35:10 PM »
http://www.societyofrobots.com/robot_parts_list_motors_servos.shtml

Define 'fast' and 'high strength'?

#### yifei87

• Jr. Member
• Posts: 9
##### Re: DC motor
« Reply #3 on: September 02, 2008, 02:31:41 AM »
fast = robotic hand need to catch a ball thrown toward it.

high strength= able to raise at least 1 pound things

• Supreme Robot
• Posts: 11,663
##### Re: DC motor
« Reply #4 on: September 02, 2008, 04:49:50 AM »
Well, first you need to figure out how fast the ball is going.

Then, given your desired arm length, calculate how fast the motor needs to move the arm.

You also need to know how much the arm weighs.

This should get you started:
http://www.societyofrobots.com/mechanics_statics.shtml
http://www.societyofrobots.com/mechanics_dynamics.shtml
http://en.wikipedia.org/wiki/Angular_velocity

Remember, if you don't calculate it, that means you are only guessing. If you guess wrong, that means you've wasted a lot of money on a motor that won't work