z axis reversed

Can anyone help me? My hard disk decided to die ( I know, should have had a backup), so I have installed the latest version of linuxcnc, now jogging the z axis goes in the right direction, but when running a program it reverses, i.e. goes up instead of down & vice versa.

Hi

In your .ini file try changing
[AXIS_2]
SCALE=
to the opposite sign it currently is
ie. if SCALE=400 change to SCALE=-400
This should reverse the commanded movement direction

regards

I use the on screen jog ( + -). I must admit that I can't see why this happens, everything was ok before I re installed. I will try ArcEye's suggestion, just received my new spindle & vfd, so decided to put the drivers etc in a new box as the old one is a bit tight on space, so may not get round to it today.

volans wrote:

Can anyone help me? My hard disk decided to die ( I know, should have had a backup), so I have installed the latest version of linuxcnc, now jogging the z axis goes in the right direction, but when running a program it reverses, i.e. goes up instead of down & vice versa.

Hello, I'm using LinuxCNC 2.5.1 for simulating code for an old CNC machine, in this old machine Z+ means down and Z- means up,

I need to inverse the Z direction in the simulation so I dont have to change the code everytime.

I have read other posts were they say to change the SCALE to negative value in the .INI file.

I opened the .INI file and there are two SCALE values of which I replaced one value to negative, then the other and finally both of them but none of these worked.

Can anyone help.

Thank you before hand.

I went to the .INI file and could not find any line with the GEOMETRY value in the [DISPLAY] section so I added the line "GEOMETRY = XY-Z" and it worked!

Thank you!

Does this mean I could make any axis invert by doing this for instance GEOMETRY = -XY-Z. I need to invert the X and Z axis.

Andy,
Will it be the OUTPUT_SCALE setting under each individual AXIS section?