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Half Sphere Grinding Machine

Page 1 of 2 - first time polishing on the machine, mirror not spherical - posted in atm, optics and diy forum ive done mirrors before manually, with good results.This is the first time im using a mom machine.Im making a 12.5 f4.7 mirror.Rough grinding carving out the initial curve was done manually with a steel ring on a manual turntable.