How to Create a Hand Crank for 24000rpm DC Motor

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SUMMARY

Creating a hand crank to achieve 24000 RPM with an 18V DC motor from RadioShack is theoretically possible but impractical. A hand crank operating at 60 RPM would require a 1:400 gearbox to reach the desired speed, significantly reducing output torque by a factor of 400. Most hand-crank generators utilize motors that operate at a maximum of a few thousand RPM, typically employing gearboxes around 1:20. Therefore, the design is not feasible for practical applications.

PREREQUISITES
  • Understanding of DC motor specifications, particularly 18V motors.
  • Knowledge of gearbox mechanics and ratios.
  • Familiarity with hand-crank generator designs.
  • Basic principles of torque and rotational speed.
NEXT STEPS
  • Research gearbox design and selection for high-speed applications.
  • Explore alternative motor options that operate at higher RPMs.
  • Investigate hand-crank generator efficiency and torque requirements.
  • Learn about the mechanical limits of hand-crank systems in generating electricity.
USEFUL FOR

Engineers, hobbyists, and inventors interested in mechanical design, particularly those exploring hand-crank generators and high-speed DC motor applications.

jhendren
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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?
 
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Possible yes, practical no.

You'll never be able to crank it fast enough with practically sized gearing.
 
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.
 

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