Hey, gotta question for you guys out there. I have a good selection of the Valenite Centra-dex 1 & 2 flute indexable mills(these mills came with a machine we purchased). I just can't seem to get a smooth sounding cut from these. I was running a 1" centra-dex today doing some helical boring (Fadal VMC15XT) . I pre drilled a .656 hole and then started helical boring. I tried going close to the finish bore(2.436-2.437) in 2 boring operations, then finish to size with a 4flute HSS end mill to finish the walls. What should I be running this cutter at? I was running 3000rpm 18.0 IPM .025 per pass. This is where I could get the best sound , slower speed and faster feeds made a thumping sound. Any help will be greatly appreciated.
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