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Mirror Sphericity

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Posted by Scott Pelger on July 24, 2003 01:40:44 UTC

working on my first 8" mirror and am trying to determine if i am ready to move on te the next grit. i am doing a pencil test (paralles lines and more perpendicular to those, then rubbing the tool and mirror (dry) together) and am noticing only a small amount of wear on the edge of themirror. the bubble distribution appears ok when i am grinding though. can i move on? does anyone do this pencil test? (ka: sharpie test.)


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