4.39 Full-Surface Machining; Fundamentals Of Full-Surface Machining - HEIDENHAIN CNC PILOT 640 User Manual

DIN/ISO programming | Full-surface machining

4.39 Full-surface machining

Fundamentals of full-surface machining

In "full-surface machining," the front and rear ends can be machined
in one NC program. The control supports full-surface machining for all
common machine designs. The features include angle-synchronous
part transfer with rotating spindle, traversing to a stop, controlled
parting, and coordinate transformation. This ensures efficient full-
surface machining and simple programming.
You describe the turning contour, the contours for the C axis as
well as full-surface machining functions in one NC program. Expert
programs are available for configuring the lathe.
You can also enjoy the benefits of full-surface machining on lathes
with only one spindle.
Rear-face contours with C axis:
C axis are oriented with respect to the workpiece, not to the spindle.
Therefore, for the rear face:
Orientation of the XK axis: To the left (front face: to the right)
Orientation of the C axis: Clockwise
Direction of rotation for circular arcs G102: Counterclockwise
Direction of rotation for circular arcs G103: Clockwise
Turning: The control supports full-surface machining with conversion
and mirroring functions.
This makes it possible to keep the usual directions of movement for
rear-side machining as well.
Movements in a positive (+) direction depart the workpiece.
Movements in a negative (–) direction approach the workpiece
The machine manufacturer can provide your lathe with suitable expert
programs for workpiece transfer.
Reference points and coordinate system:
machine and workpiece datums as well as the coordinate systems
for the spindle and opposing spindle are illustrated in the figure at
bottom. With this design of lathe it is recommended to mirror only
the Z axis. Then, for either spindle, moving in positive direction will
stand for motion away from the workpiece.
Usually the expert program contains the mirroring of the Z axis and
the datum shift by the dimension NP-Offs.
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017
The XK axis and therefore also the
The position of the
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