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Vacuum Tube LEDs: 21HB5A on a Guilloche Platter
With the Joggy Thing running in LinuxCNC 2.7, touching XY off on the fixture was trivially easy:

LinuxCNC – Sherline Mill – Logitech Gamepad The pips are 100 mm apart at (-50,-50) and (+50,50). Astonishingly, the laser aligner batteries are in fine shape.
I should have protected the platter before drilling all those holes:

Guilloche platter – drilling All’s well that ends well:

21HB5A – Guilloche platter It looks even better in the dark, although you’d never know it from this picture:

21HB5A – Guilloche platter – dark I wish I could engrave those patterns on already-drilled platters, but dragging a diamond point into a hole can’t possibly end well. I could deploy the Tiny Sandblaster with a vinyl mask, if I had enough artistic eptitude to lay out a good-looking mask.