2014-09-09 (Tu) ESPeri.Impass

Thin bar, narrow bar, and rod brass stock was purchased from a local hobby store. The concept was to tap on the top of a compass spinner but contact would only be made when the spinner has a raised portion under the tapper. This raised portion will be metal to give the shortest moment of impact.

The wide bar brass was bent using pliers and fingers since it was thin. A shape was made to hold the flanged bearing in place with the help of a rubber band. A small brass bar, 1/64" x 1/32" (0.396mm x 0.793mm) was bent around a toothpick to form a torsion spring. The spring was soldered to the spacer holder then bent so the spring reached into the space to be near the compass spinner. The spinner was supported by a small steel bearing held to the magnet by virtue of its own magnetism. The method had the advantage of self centering the pivot point and a low profile. A video was made to show the spinner working.

 Bending the bar stock into a shape

Forming bar stock around flanged spacer

Thin rod stock and toothpick

Forming torsion spring

Brass torsion spring

Torsion spring soldered to spacer holder

Rubber band holding spacer to brass parts

Magnet with bearing to act as pivot

Video of compass spinner being rotated

To do:

  • Install tapping weight
  • Test + Evaluate
  • Redesign
  • Rebuild
  • Repeat

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