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After I finished work on my primary project yesterday afternoon, I had a bit of time left until the 3d print finished. So I decided to have a play with my new self made sensitive drilling attachment.
Aim was to drill a 0.5mm hole in some brass.
I achieved that with minimal breakage. I've just had a chance to test the hole with gauge pins.
500µm pin fits.
600µm doesn't git.
I'm considering that a big win.