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Ok heres a problem...this afternoon I had a 2" bar 24"L (EN1A) put in one of the lathes (colchester triumpth) first cut 0.025" along the whole length to true and bring to size, followed by a 1" shoulder 2.225"L... Set dros clocked to +/-0.002... new tip on the tool, everything tight, live centre...A job that Iv done hundreds of times. 500 RPM 0.010" Cut and wallop chatter gallore....less cut still chatter, more speed, less speed, slower cut still chater, bolted steady up still chatter not quite as much but still there.....The only way I can stop it compleatly is loads of speed 1500rpm 0.003" cut and lots of feed which isnt right....aggggh gave up came home, any ideas please?????