1R50.40 Ball Bearing Model

Concepts

Single crystals, frustrated packing, grain boundaries, vacancies, vicinal surfaces

Overview

Ball bearings demonstrate single crystals, frustrated packing, grain boundaries, vacancies, vicinal surfaces and so on. Note: this demonstration can be shown on the overhead projector and is appropriate for large lecture halls.

Details

Equipment

  • [1] Approximately 4000 1/16 inch ball bearings between two lucite plates

Important Notes

  • The ball bearings can become electrostatically charged. If this happens, a few ball bearings will 'hover' near the surface
  • This demonstration works best when the model is nearly flat on the table/overhead. It does not work when it is held upright

Script

To demonstrate a single crystal:

  1. Slowly move the balls to the 120 degree end.

To demonstrate frustrated packing:

  1. Move the balls to round end.

 

Additional Resources

References

  • PIRA 1R50.40

Disclaimer

  • Don't attempt this at home!

Last revised

  • 2018

Technicals

Related AV

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If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.