The Virtual Machine Shop

zero return check

CNC programming uses the G27 code word to check if the programmed position in the block containing G27 is at the machine zero reference point. If true a light comes on in the controller. If false the prograsm is stopped and an error is dsiplayed. Any axis may be chosen. Example G27 X1.2 checks only the X axis for correct machine zero position. This is used to check for program errors.