we have six ctv250's and are all about the same age approx. 10 yrs these machines have a siemens 840d control. On the z axis we are getting a vibration problem when changing direction in rapid which continues to vibrate when stood still the only way to stop this is to hit the E stop.we have changed the motor and ballscrew and bearing replaced the encoder cable but the problem still persists,and has started to occur on the other 5 machines has anybody else come across this problem before as we are at a loss as to what it could be. or is it some kind of feedback noise problem. pls help
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