Having problems with the carousel style tool changers on these machines. About 80% of the time there is no issues, then randomly the carousel will index into the wrong position. Checked & replaced all the drive belts/pulleys & sensors/wiring & haven't found anything. When it does happen the cam that triggers the proximity switch/sensor has just travelled past the switch/sensor. It can happen when it rotates in either direction & doesn't seem to be tool number/position dependent. I don't want to get into pulley the tool change apart further but has anyone had similar experiences. Running siemens controls if that make a difference??

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