I purchased an Iscar 3/4" heliball mill lately, after spoiling a solid carbide ballmill on a job milling some C4340 HTSR. I was pleased with the results. The insert seemed to stand up very well. The insert costs as much as resharpening the solid tool anyways. However, the insert has much higher technology design in the cutting edge than is possible with a solid carbide tool. There are both roughing and finishing inserts available, with different geometries.
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