2023-08-05 (Sa) GrinderCompassMKII Custom aluminum posts

I have been using spring-loaded pins mounted through my frame to hold the magnet in place, but I wanted to make a version where the pins were part of the spinner, which is how I made the previous working version. According to the label, my magnets had a 0.100-inch inner diameter or 2.5 millimeters, but I suspect it was 2.54 millimeters. I had some M2.5 nylon bolts, which fit, so I ordered some threaded rods and coupler nuts, but while I waited, I worked on custom aluminum rods.

I tried inserting the rod into a cordless drill to spin and then applying pressure with a metal lathe tool, but I quickly gave up on that idea. I reverted to the method of using two rotating tools simultaneously. I kept the rod in my drill, then used a rotary tool running at high speed to work away the material. The process had none of the precision associated with metal lathing, but I made a few pins that could hold the magnet. For reference, the magnet is 1/4" (2.54mm) in diameter and length. The aluminum was 1/8" (3.175mm) round stock.
Pins in the order I made them, from left to right

The fastest work was putting aluminum rod segments into the rotary tool and holding a hacksaw blade below. I made sharper angles and smoother shafts but smoothed everything with sandpaper discs in another rotary tool. I put a magnet on one of the custom pins and wedged it between two brass pyramids to make something the size of a large marble. The spinner moved easily, and I made an animation where I spun the magnet with my finger magnet.


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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