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Machining 6061 0.31x15x18 part flatness?

Lazyman

Aluminum
Joined
Nov 28, 2016
Customer wants a 100 parts 0.31x15x18" 6061 part flat to within 0.02" and plus/minus 0.004" thickness tolerance. Parts have 2 in through hole in middle and very minimal machining on outside perimeter. I have had good result before on smaller plate with vacuum chuck and flipping and facing 4 times but a but wondering how flat I could get a thin plate this size?
 








 
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