Z axis cuts in the air - not plunging

yeah switch is at the top

I thought homing was necessary so the machine knows where it is in the real world - as it were

Jeff65 wrote: yeah switch is at the top

Ok on a fresh start of linuxcnc I think what you are saying is that when jogging Z before homing page down z goes down, then when you home its start going up to the switch then backs off it. But then you are saying that Z goes down with page up is that correct.

No -fresh start of Linuxcnc - before homing - page up makes it goes down
page down makes it go up.
After homing - same thing

Jeff65 wrote: No -fresh start of Linuxcnc - before homing - page up makes it goes down
page down makes it go up.
After homing - same thing

But you said

At the moment the Z axis is moving the way it should - page up it goes up and page down it goes down and on the screen the same is apparent.

Its just when i try to home it goes off in the wrong direction

please just post the z section of the ini file

Z axis part of ini file

[AXIS_2]
TYPE = LINEAR
HOME = 0
MAX_VELOCITY = 12.5492060976
MAX_ACCELERATION = 13.0
STEPGEN_MAXACCEL = 16.25
SCALE = 2000.0
FERROR = 1
MIN_FERROR = .25
MIN_LIMIT = -75
MAX_LIMIT = 0.001
HOME_OFFSET = -2
HOME_SEARCH_VEL = -1.000000
HOME_LATCH_VEL = 0.050000
HOME_FINAL_VEL = 2
HOME_SEQUENCE = 0