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CMM Granite too hard

#1
How can you set up parts on a CMM granite table that are fragile like graphite or silicon? The table causes the material to chip on the edges due to the toughness of granite. I need repeatability ideas.
 
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#2
Fixture the parts in such a way that the edges do not contact the granite. What are your datums? Can you attach a picture?
 

Miner

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#5
Can you set the discus on a puck that is made to a smaller diameter? That would prevent the edges from chipping, yet provide a stable repeatable surface.
 
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