2023-04-01 (Sa) GrinderCompass Second assembly

I needed the lowest friction possible between my compass spinner and the frame. I ordered zinc-alloy spikes and purchased 1/4" (M6 would be comparable) brass nuts and bolts. I drilled divots into the hardware with 3/16" (M4.5 would be comparable) HSS bits. In my first attempt, I held the bolt with my hand and applied minimal pressure in case I lost control, but the problem was keeping it steady. Once I realized this was foolish, I drilled a hole in an old cutting board, mounted the hardware, and cut into the end of the immobilized bolt. I relied on the drill bit angle to make a concave shape.
Bolt with a divot

I revised my design to a long spinner with pendulums on either side and a support bracket that could clear the bottom bolt. Unfortunately, the support stuck out as far as the protrusions that were supposed to rap against the side when facing north, so I need to reconsider. The spike & cup design worked well, with minimal friction between the spinner and supports. I swung the compass around with an off-camera magnet to show how smoothly it operated.
Assembled and rotating

The rest of the posts for this project have been arranged by date.
First time here?

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

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