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| Grinding Help
Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To Posted by Jarvis Krumbein on November 7, 2002 18:06:55 UTC |
It sounds like the mirror is not yet truly spherical. This is not uncommon after rough grinding and only means that you should continue with the center over center strokes to true the surface up. When you think that the surface is spherical, try doing the sharpie test to be sure. Only then can you continue on to the next finer grit.
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