[protohaas]

Hello fellow cnc zoner's, I have a hurco 1997 4020ht siemans drive with some spindle problems.
when speed reaches 3000-4000 rpm motor starts to growl and vibrate also not orientating the same
jumping all over, any ideas? thanks!

[bloke]

Set it running in manual at around 10RPM and with a smooth toolholder, try stopping the spindle by hand to see if there are any ‘dead’ areas during rotation. You may have a failing output stage.

[protohaas]

i went out and gave it a try seems smooth all the way around
thanks bloke!

Set it running in manual at around 10RPM and with a smooth toolholder, try stopping the spindle by hand to see if there are any ‘dead’ areas during rotation. You may have a failing output stage.

[bloke]

Could be the encoder in the motor then.

[protohaas]

we replaced the encoder, cable and had motor rebuilt

Could be the encoder in the motor then.

[protohaas]

We are thinking the siemans spindle drive card, are these known to go haywire?

Could be the encoder in the motor then.

[bloke]

They can do. Bear in mind there are hundreds of parameters to copy across to a new unit. Best off getting a copy of the IBS software and an old PC.

[protohaas]

i know we have been typing them in by hand, hurco sent us the list for our machine, hopefully they are all correct, i wouldnt know where to
start if there not.

They can do. Bear in mind there are hundreds of parameters to copy across to a new unit. Best off getting a copy of the IBS software and an old PC.