Re: Yet another BT30 Design and Build Adventure.
Originally Posted by
gloveless
I was thinking about running closed-loop servo motors but then I wouldn't have any feedback and if we had a crash or something bad which you should never have, but we all know does happen there would be no way to detect the crash with a closed-loop system, but if the servo motor driver had an output when the motor is not within the parameters of acceptance, meaning when the motor is supposed to spin 100 times but only spins 90 times around, I would like a fault. I'm not exactly sure this is something a closed-loop system could do, thoughts?
By definition all servos are closed loop, the loop can be closed at the drive or the controller.
Every servo drive I have seen has an error (fault) output. Most have a settable encoder error limit parameter, where if the following error becomes too great or the servo is greatly overloaded, then the servo drive will shut down and trigger the fault output.
Rigid tapping does not require a servo motor, all that is required is an encoder on the spindle and the proper software to electronically gear the spindle to the Z axis.
Jim Dawson
Sandy, Oregon, USA