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Homemade Mirror Grinding Machine

A good starter size is the 150 mm 6 mirror.A 200mm 8 will also work.Most atm books and websites recommend a pyrex mirror blank, but in my opinion, annealed plate glass is better for this first, learn and practice mirror.It is cheaper, it is softer and grinds faster, needing less abrasives and with these small sizes, the low expansion glass like pyrex has no practical visible at.