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  • Joy of Mirror Making: Fine Grinding

    For large thin mirrors, say 12 inches [30cm] or greater and 1.5 inches [4cm] or thinner, the mirror back must be ground flat, or at least regular in shape before beginning fine grinding the mirror's face. Cast a tool specifically for the mirror's back, and grind with 220 grit, inspecting for low unground spots. Grind until they disappear.

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    GOAL: You have completed fine grinding when you have: Smoothed the mirror surface until it feels "buttery soft" to the touch with pits approximately 5 microns in size so that it is ready for polishing. Shaped the mirror surface to be very closely spherical, as indicated by the Pencil Test.

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