Fred,
S Inc is missing from my screen
Not sure where they got the pic for the manual but it is missing in the 1024 lathe screen set.
It dosen't matter since the value you put in the input box below the buttons will be used to change the increment.
Do a Tab to bring up the Jogging flyout window and you will see the step changed there also based on what you input.
On my screen i cannot get the jog cycle to register less than 0.0001
The DRO only displays to four places, you would need to change the screen for it to display differently, but the input value
will be used. To test input say .00002, then incrementaly jog 5 times and you will see that the axis DRO displays .0001" of movement.
From a practical point of view, chances are that the mecahnical system can't accurately move in increments less than .0001" accurately. It is difficult to confirm very small movements ie; for a .00002 would need a standard and microscope at 400x or better to see if the move happened.
RICH