Four independent jaw blades each positioned via a leadscrew driven by a 1.8 deg stepper motor integrated into a custom vacuum enclosure. This eliminates the requirement for additional chamber Jaw blade position feedback via motor step counting in the subsequent motion control electronics.
Optionally conductive linear potentiometers can be specified to provide absolute position measurement or rotary incremental encoders can be fitted to the rear of the motor shafts.
Additional reference positions to be obtained from end-of-travel limit switches located at fully open position on each axis.
Manual positioning of the axes is possible via integrated rear hand-wheels.