2023-08-06 (Su) GrinderCompassMKII Spongey cap holders

I measured a conical brass nail head because they were a usable shape, and I had some on hand. They were wider than necessary, so I drafted a tool to hold the cone's top with tape while I filed away the bottom. I revised my design to one that used the posts to stick through a piece of wood on a rotary tool spindle. While the nail head spun, I carved away the top with another rotary tool sporting a cutoff wheel. The design worked well, and I made a few brass cones.
Brass nail head mounted on rotary tool spindle

I designed a frame to hold a piece of 2mm thick double-sided tape, the brass cone, and the aluminum spinner shaft I made yesterday. The double-sided tape provided a bit of springiness. In the first round, I made four with 1mm height differences. One was nearly a perfect fit, but there was a bit of wobble.
Almost a perfect fit

I cut new frames with 0.1mm height differences. I went through a few iterations, as evidenced by the revision number at the bottom of the frame, but I made one that spun freely without any wobble!
Many revisions later

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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