Re: Gcode

For most lathes the program zero for Z is set by measuring the offset
from a known reference such as the face of the spindle. Typically, a
lathe will use a chuck (or collet nose) so the total Z work offset
would be the thickness of the chuck plus the amount the workpiece
protrudes from the chuck.

On one of my lathes I do it this way:

N10 G92 S4000 Z2.5
N20 G54 G59

The value Z2.5 is the amount the work protrudes from the chuck and is
added to the G54 chuck offset value (chuck thickness, stored in the
controller's work offset table). I recall the chuck is about 3"
thick, so that would make the total offset 3 + 2.5=5.5". Note the
value of G54 is a constant and was stored in the control, the only
measurement for a new job is to determine the amount the work
protrudes from the chuck.

There're other ways to do it, but that's the one I use most of the
time.

Doug

--- In CAD_CAM_EDM_DRO@y..., "andrewyslee" <andrewlee@s...> wrote:
>
>
> In a mill, one will set the program zero by touching a point on the
> workpiece surface.
>
> For a lathe, how does one set the program zero?
>
> Thanks
>
> Andrew