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    purple33's Avatar
    purple33 Posts: 2, Reputation: 1
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    #1

    Dec 17, 2008, 12:13 PM
    What size DC gear motor do I need?
    I am building a motorized vehicle for an engineering project that will operate on 12V of DC current. I need to be able to flip a regular light switch that is mounted on a platfrom. I wanted to use a paddle type arm attached to a 12V DC gear motor. How can I tell what type of RPM's I need? Some of the motors are 65RPM, 490 RPM, 162 RPM... HELP!!
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Dec 17, 2008, 03:14 PM

    The RPMs for the motor will depend on the gear set that you are building to operate the arm that will flip the switch - tell us about that. You may find that your choice of motor is driven by the torque you need - have you determined that yet?
    purple33's Avatar
    purple33 Posts: 2, Reputation: 1
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    #3

    Dec 17, 2008, 03:32 PM
    I don't know what torque I need and I guess that I thought with a gear motor I would not need to build a gear set. Some of the motors that I was looking at said that the gear ratio was 1:10 and the torque was 0.7 Lb -Inch. I'm not sure what to do next.
    Thanks!
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