2023-07-30 (Su) GrinderCompassMKII Steel endcaps

The magnets I chose for the compass spinners were hollow cylinders, and I needed to hold them from above and below with a couple of pins. I designed discs to sit on the ends and provide a cup for the nails. I picked thin steel because it should sit on the magnet without moving and is pliable enough to take a divot but strong enough to withstand extended use.

I cut a steel strip from an Altoids container with a cutting disc in a rotary tool. The head of a #6 countersunk machine screw was approximately the diameter I needed, so I used it as a template to cut a bit of the sheet, then stuck it to the bolt with some double-sided tape. I held the bolt in a drill, placed the cutting disc at a right angle, and then ran them together to grind the steel into a circle.
Rounding technique

The result was a clean steel circle with the same diameter as the screw head. The process was slow since I had to move the spinning parts together gradually or risk dislodging the part. After the first piece, I also ground off the paint.
Disc formed

I made five discs, two for each spinner and a spare. I used an automatic punch to divot the center. When I applied the full force and activated the internal hammer, the pressure pierced the steel. Fortunately, I did not test on one of the discs.
Four 12mm steel discs with center divots

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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