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Hard coat 7075 aluminum


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You can do it but there will be random chipping.

You need a high rake insert and then possibly lap an even higher rake onto it. Turn it slowish with gentle feed and then I've even "deburred" the ultrasharp edge/shoulder with an oil stone with the chuck running.

It's not an easy job to do but platers hate to mask, or charge a fortune for it, and the boys in the office think they're saving money by doing it.

Good luck

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