Z axis cuts in the air - not plunging

OK - thanks for that

So I need to know if I should undo everything I've just tried to solve things.

I changed over 2 wires on the stepper motor.
I changed HOME_offset to -1 from -64
I corrected the spelling mistake which was obviously needed.

Before I did all that the motion of the Z axis was not matching what was on the screen - jogging up was displayed on linuxcnc as going down and vice versa

Everything seems to match now but i can't home the axis as it moves away from the switch

Sorry i'm not aware of your actual status. But actually its not so complicated.
1. Make sure that your screen and your machine make the same moves.
2. If homing does not work : read this very good document
linuxcnc.org/docs/2.8/html/config/ini-homing.html
3. Adjust gcode

My personal taste is to stay in positive configuration numbers for scaling etc.. If motor turns wrong, i swap two wires. Negative values confuse sometimes when coming to homing..

For scut i propose you to fiddle around with that starting point.

Mike_Eitel wrote: Sorry i'm not aware of your actual status. But actually its not so complicated.
1. Make sure that your screen and your machine make the same moves.
Test in jogging modus. Give a midi g0 X0 and then g0 X1. See if itdoes what you expect. Repeat for Y and Z.
2. If homing does not work : read this very good document
linuxcnc.org/docs/2.8/html/config/ini-homing.html
3. Adjust gcode

My personal taste is to stay in positive configuration numbers for scaling etc.. If motor turns wrong, i swap two wires. Negative values confuse sometimes when coming to homing..

For scut i propose you to fiddle around with that starting point.

OK thanks for your help.
One last question -
So its best for a Z axis to be positive as its raising or positive as its descending?

Jeff65 wrote: OK thanks for your help.
One last question -
So its best for a Z axis to be positive as its raising or positive as its descending?

Are you in the UK by any chance?

For a milling machine it is general for the z axis to move down going negative so 0 is at the top

In the uk I am indeed.

Ok thanks for that clarification

I will do some more tweeks on the CNC tomorrow - and see if I can finalise things