2023-08-24 (Th) GrinderCompassMKII Feedback from a weakened spring

I used my rotary tool and a paper sanding disc on the flat brass spring. I wanted to thin it uniformly so the bolt and nuts would bounce up and down with minimal side-to-side movement. It was not easy to judge how well I wore down the brass, but I did weaken it enough in one region so that when I bounced my hand, the hardware oscillated three to four millimeters for a few seconds.

Thinned brass strip

With a suitably flexible spring, I adjusted the spinner mounting bolts and pendulum nuts under the bottom bead to collide when facing north. With a casual bounce, akin to taking a step with this device on my torso, I felt the metal hitting, but only when the compass faced the target direction! If I streamline this design, I can make a wearable test version of the haptic compass.

Bouncing tapper

GitHub files for GrinderCompass
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2023-08-23