Re: Hercus Mill Help

Lloyd

First place I'd look for the cause of the failure is toward the motor from
the amp board. A short in the flex wiring, or swarf cutting the insulation,
bad brushes, accumulated graphite dust, stuff like that will cause many of
these amps to burn final transistors. There may also be some small-value
resistors that are used to sense current that will also blow from bad
motor/wiring.

Some amp manufacturers and machine tool builders didn't use very good
transistor protection in this critical area.

Ray


From: "Lloyd Stallkamp" <lloyd.stallkamp@...>

>Help--We have a Hercus CNC mill (originally made in Australia I think) at
>the college where I teach and am having trouble--The servo driver board on
>the Y-axis keeps blowing--major power transistor failures among other
>things.