2023-08-20 (Su) GrinderCompassMKII All-metal frame

I coiled wires around objects, like a round pill container and a double-A battery. I assumed I would have to wrap both with copper wire, then determine how much the coil expanded after I released it, but if I kept the wire snug, it hardly changed when I let go. I soldered a brass nut to the bottom and tested its bounce by bumping my hand against the table. I tried attaching the battery-wrapped cable to the top of the compass, but I could not assemble it with my bare hands.

Battery-wrapped copper spring

I had some 12AWG bare copper wire, so I bent it into the approximate size of a frame because I can easily solder a copper spring anywhere. I cut a couple of brass cones from the nail heads, but they were so large they interfered with the beads, so I made a couple of smaller ones that were easier to assemble. I "tuned" the frame by bending the ends closer and further until the axle could turn freely without wobble. I removed the spinner and placed the coil, but it would rub against the cone, so I needed to reconsider how to make the frame.

Copper frame with brass cones soldered to the ends

GitHub files for GrinderCompass
The rest of the posts for this project have been arranged by date.
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Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10

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2023-08-20