Hello. I am doing a 4.50-8rd. i,d, thd on a Wacheon cnc lathe c200.i am using a 1.500 dia. lay down threading bar. This is the biggest bar i can use in this machine. The part is 9.00 long and i can only chuck 4.250 deep.Thread is 3.00 deep into the part The chatter is on the back side of the thread.Have run rpm from 325 to 225 rpm.Currentley using a G76 canned thread cycle with a 30 degree infeed angle. Any help appreciated. Thanks in advance.
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