I set Bridgeport for some dovetail cutting using 1 3/8" cutter by F.K.D, I was running 100 RPM and feeding 3.0 IPM for plain 1020, I had radius comp on, which initially was 250 thousands more then actual tool radius and conventional milling, anyway after first pass which took .100 I decreased radius comp by .05 and then it happened, my coffee mug felt from work table, it was like the whole table with my part was beating against the cutter, I reduced feed rate almost to 0.5 IPM and only then beating stopped, but it still chatter. So what have I done wrong, I was running HSS tool using optimal speeds and feeds...
Here few images when chatter started:
here I reduced feed rate, but it still chattered
Here few images when chatter started:
here I reduced feed rate, but it still chattered