my cnc

[SPIKE]

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

[Clive S]

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

I asked this question here.

In Red I am not sure but it looks like you set that at the top of the part corner. When you do that it should make the DRO zero then if you jog the machine ie. 20mm the DRO should read 20 and the actual physical distance should be 20mm travelled. If it has not travelled the correct distance you have another problem to fix.

Are you saying that if you command the Z axis to move down 1mm it actually moves 20mm !! Is so does the DRO show 20 or 1

when you zero the Z (it should show 0.000) and move the Z down does it put a - sign in front ie. -20.00?

Please just answer the above 3 points.