cheers for that Jazz i'll play with it some more , i have the homing set up and tested and all is in order. each axis stops on the money each time. i have the overide with buzzer wired into BOB ( overide X,Y,Z, input) i engaged ''Z'' axis to trip and ''Y'' axis to trip and the overide worked a charm but when i tried the same for ''X'' and slave, the overide has no effect. i have '' HOME SW SAFETY '' unticked and '' and HOME SLAVE WITH MASTER'' unticked. any suggestions?