I has an problem in KIA SKT28. These machine has FANUC 0i TB controller. In the past, one year late, KIA send these machine to us whith wrong parameters of the spindle (parameters 4000 to 5000). The ID of the motor is wrong, and other things, like acceleration, .... So, an tech from Fanuc put anothers parameters to these motor. Do auto tunning. Now, has an problem, that when the machine cut's an thread whith G33 or G76, the thread to be vibration !!! I change the insert's and the tool, but the problem stay's. I change the step, and nothing happens, change the diameters, and nothing happens too, whith tailstock and whithout, and nothing. I call KIA, and the techs don't know what's the problem. Somebody knows how i can solve these problem ???

Thanks

Daniel