Hand Mixer





Name of Activity

Hand Mixer


Kara Miranda


hand mixer, gears, gear ratios, not classroom tested, prototype, Engineering Design Process, 4-6, 7-9, 2 Hours Total



Grade Level

4, 5, 6, 7, 8, 9+


2 Hours Total

Brief Description

Students will design and build a hand mixer, learning how to use different gears in a variety of ways. *NOTE: not classroom tested.

Lesson Objectives:

To apply building techniques and knowledge about gears to an activity challenge.

Materials Needed:

RCX or NXT LEGO kits

Photos of different hand mixer designs

Assortment of extra LEGO pieces, especially gears and beams

Building Design Sheet

Preparation and Set Up:

Collect necessary materials

Photocopy worksheets

Arrange students into groups of 3

Decide how you will distribute extra pieces

Write design requirements on the board

Necessary Background

Review Gears and Gear Ratios



Engineering Design Process


Gear Ratios


  • Tell students that in this challenge they will be building a hand mixer.
  • Show students different pictures and/or videos of hand mixers, explaining what they do and how they work. Also, it may be a good idea to review how gears work. Explain the engineering design process, emphasizing prototype and redesign.
  • Tell them the requirements for their hand mixers. For example:
  •      Must have at least three gears
  •      Can be a manual or electric hand mixer
  • Allow the class to brainstorm different ideas for their mixer design. Have them plan out and draw their design on the Building Design Sheet.
  • Distribute materials and have students start building.
  • After the students finish, review the activity with the class. Have them share their ideas, ask groups to explain what the hardest part of the challenge was, etc.


Have students add more gears.

Have students make the bottom of their hand mixer spin faster or slower by adjusting the gear ratio.

Reference 1


Reference 2


Reference 3


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