Video-How to Design a Pencil Sharpener with Planetary Gears

Written by Corey Rasmussen in Gears,Mechanical Design Last Updated August 22, 2024

Yes, planetary gears can even be found in pencil sharpeners. This is an unusual situation because there is no sun gear in the system. Also, the carriage is input and the planets themselves are the output.

Let’s explore this unique creation that has been right under our nose for years.

Download Our Planetary Gear Calculator For Free 

Easy to use Excel Based Calculator.  Quickly calculate number of teeth on gears and output speed.  Doesn’t matter what the inputs or outputs are; it’ll calculate it.

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https://youtu.be/0Eu5nvEyUeg

Excited to Learn More About Gears? 

Sign up for Mentored Engineer’s FREE Comprehensive Gear Design Master Class ($500 Value) that includes his Planetary Gear Calculator ($250 Value) and weekly Mentored Engineer Newsletter

The Comprehensive Gear Design Master Class is a 17 part series of videos and text where you will learn:

  • How to size gears so they mesh
  • Calculate the stress on the gear teeth
  • Calculate gear ratios in planetary system

After completing this course you will be able to correctly design and spec gear boxes for your applications the first time.

The course and the calculator have a combined value of over $750! for FREE

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Corey Rasmussen

Corey Rasmussen is an award-winning professional engineer (NC and TX) with over 20 years of product design and development experience. He has two patents related to aerial lifts machinery, has advanced certifications in hydraulics and electronic controls, and specializes in designing mobile equipment. Corey is the principal engineer of Rasmussen Designs and is based out of Durham, NC.

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