Sorry my bad the machine works 99% it is just the z axis, if i set the jog to move say up or down say 1mm jog at a time when i send the information to the cnc or just jog the spindle it will move about 2cm instead of 1mm up or down now thats in jog mode or milling i hope iv'e explaining this correct
please for give my ignorence when you say Z readout go -ve going down i dont quite understand
take care Colin