Hi Craig
See attached.

Hi,
when you jog the Z axis does it physically move?

Craig

Hi
Yes it does. The machine works perfectly. I just want to do material detect using a floating head.
But all the sample scripts i find dont seem to fire the Probe because it appears that there is no Z to read but i know the z is fine.
Grr
Thanks
Rob

Hi,
forget the G31 until you have this sorted.

On the diagnostic screen jog the Z axis. Does the axis physically move? Does the number Current Position change? Does the number Machine Co-ordinate change?

Craig

Hi,
it fundamental to Mach, in fact all CNC machines if an axis moves then the machine co-ordinates change.

If your Z axis is moving and your Z axis machine co-ordinates are not changing the your copy of Mach is broken somehow.

G31 is coded in current work co-ordinates. So:

G31 Z -0.5 F10...... will cause the Z axis to drive at a rate of 10 in/min from its current location to -0.5 inch or until it detects a probe strike.

Craig

Hi Craig
When I jog the Z axis it moves, The current position changes but the Machine Coords do not change even though they do for the XY
I've installed Mach3 on 3 computers now and I have the same problem. I'm confused.
Plain vanilla installs as well, nothing changed.
Oh and the G31 works but when I trigger the Probe it doesnt stop the Z axis.
I need to look into this further.
Thanks
Rob

What motion controller are you using?
As Craig says, if the machine is moving, the machine coordinates should be changing. If not, something is seriously wrong with your installation.

Hi Gerry
I'm using a UC100 from cnc4you.co.uk
Its just odd that the other axis are fine.

Thanks
Rob

Hi,
I can' conceive of a fault that would allow an axis to move WITHOUT the machine co-ords changing.

Try a fresh copy of Mach. other than that I think it must be the controller. Email CNCDrive direct.

Craig

Do you have the latest plugin for the UC100? You can update it from the plugin monitor screen in Mach3.