Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Hand Crank how to?

  1. Nov 28, 2011 #1
    I want to create a handcrank to spin a DC motor at 24000 rpm. The DC motor is an 18V hobby motor from radioshack. Is this possible?
     
  2. jcsd
  3. Nov 29, 2011 #2
    Possible yes, practical no.

    You'll never be able to crank it fast enough with practically sized gearing.
     
  4. Dec 1, 2011 #3

    Mech_Engineer

    User Avatar
    Science Advisor
    Gold Member

    If you figured you would be able to spin a hand crank at about 60rpm (1 rev/sec), that means you'll need a 1:400 gearbox to step up the speed (and it will reduce your output torque by a factor of 400 as well). My guess is most hand-crank generators utilize a motor which spins at a couple of thousand rpm at most, meaning the gearbox is on the order of 1:20 or so.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Hand Crank how to?
  1. Hand crank power? (Replies: 7)

  2. Hand crank generator (Replies: 1)

Loading...