3D Printed Arduino GRBL CNC Router
Retractable Threading Tool
PDF Plans
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Automatic Centre Punch
Additionally three springs are required. I used 6x40mm compression springs. I put three together in the top and one on the firing pin. The one on the firing pin was cut down a bit and bent to the side, enough so the pin catches the hammer on the way up.
Flexure Surface Gauge
Plans in PDF format Notes: The holes for the 6 mm ball bearings should be 5.5 mm in diameter rather than 6 mm.
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