2023-08-09 (W) GrinderCompassMKII Spring-loaded pins

I took yesterday's pogo pin bolts and put them in coupling nuts to mount them in my drill to cut off the bolt heads and sharpen the ends. I had problems with the nylon bolts sticking inside the nut, and I revised the technique by putting three or four nuts on at a time to remove one at a time and lessen the friction during removal.
Three spring-loaded spinners

I wanted a bolt at the top and bottom with a central divot to seat the pins. I cratered and tried four sizes but settled on M2.5 to match the hardware running through the magnet. I put a bolt in the drill and carved a divot with a scalpel tip in the center. I was surprised by how well this produced a centered hole, but I had to be accurate with the blade.
Bolts with divots

I drafted and cut a simple frame with three 2.5mm holes in a row. I installed the devoted bolt in the centers and some brass rods on the outside. I adjusted the height to approximately the height of the spinner and fastened it securely with a couple of nuts on either side of the wood. I added the central bolt and tightened it slowly until it made contact.

If I kept the bolt loose, the magnet spun freely, but if I pressed hard enough to compress the pogo pin's spring, it would not rotate. The pointed bolt may impart too much friction, but it quickly became stationary even if I installed the metal pin facing down. The springs in this type of pin may be too strong.
Two moderately functional compasses

GitHub files for GrinderCompass
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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