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Pro tip: I thought those $8 insert carbide cutters for aluminum were a waste until I tried one on a 6061 job last Tuesday
A guy at my local supply shop in Fort Worth kept pushing the polished inserts over the cheaper ground ones for finishing passes, and I figured it was just a sales pitch. Ran a batch of 40 parts on the Haas with the cheap insert first and got chatter marks on every face, so I swapped in the polished one and the finish came out mirror smooth with the same feeds and speeds. Has anyone else noticed this difference on aluminum, or did I just get lucky with that one insert?
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