2014-09-11 (Th) ESPeri.Impass

A 2.5mm bolt was clamped into locking pliers and the head was reduced using a grinder. The bolt was turned twice so 3/4 of the head was removed. The modified bolt was inserted into the magnet. Since the bolt was ferrous it held itself in place. The magnet and bolt assembly was put back into the flanged spacer to confirm that the spring could tough the remaining bolt head. However the spring needed to travel nearly 1/8" or 3mm to reach the bolt head. A brass #6 nut was soldered to the spring arm to add inertia. A #6 bolt was added to the nut to add more inertia but it was still insufficient to tap the reduced bolt head on the compass spinner.

 Holding bolt with locking pliers

Reduced bolt

Reduced bolt

Reduced bolt next to magnet

Reduced bolt in magnet

Nut soldered to spring

Reassembled unit

Bolt for added inertia 

Spinning the compass with its reduced bolt

To do:
  • Wind weaker spring
  • Add mass to spring
  • Test + Evaluate
  • Redesign
  • Rebuild
  • Repeat

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