2023-08-08 (Tu) GrinderCompassMKII Spring-loaded bolts

The previous compass design would be repeatable if I could reliably manufacture aluminum posts. The technique relied on double-sided tape for its springy quality, but that will degrade over time. It may last longer if it were sealed in a noble gas, but I wanted to experiment with a spring-loaded axle.

I had some pogo pins in my stock, so I designed a drilling jig to hold an M2.5 bolt that fits into the middle of my cylindrical magnets. The fixture is layers of plywood that contain a bolt at one end where I can clamp it into an electric drill, then it holds an M2.5 hexagonal coupler nut, and the far end has pinholes to guide a miniature drill bit down the center.
Drilling a plastic bolt

I destroyed two coupler nuts and nylon bolts but had three successes. If I had a proper lathe, it would be a higher success rate. I can use the threaded portion to mount it into a magnet, and the spring-loaded top can provide the necessary tension.
M2.5 nylon bolts with pogo pins installed

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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