HEIDENHAIN iTNC 530 (340 49x-01) - Manual (Page 464)

464 9 Programming: Special Functions
9.6 Defining the Mac
h
ining Plane via Thr
e
e P
o
ints: POINTS
P
LANE
9.6 Defining the Machining Plane
via Three Points:
POINTS PLANE
Function
A machining plane can be uniquely defined by entering any three
points P1 to P3 in this plane. This possibility is realized in the POINTS
PLANE
function.
Before programming, note the following:
The connection from Point 1 to Point 2 determines the
direction of the tilted principal axis (X for tool axis Z).
The direction of the tilted tool axis is determined by the
position of Point 3 relative to the connecting line between
Point 1 and Point 2. Use the right-hand rule (thumb = X
axis, index finger = Y axis, middle finger = Z axis (see
figure at right)) to remember: thumb (X axis) points from
Point 1 to Point 2, index finger (Y axis) points parallel to the
tilted Y axis in the direction of Point 3. Then the middle
finger points in the direction of the tilted tool axis.
The three points define the slope of the plane. The
position of the active datum is not changed by the TNC.
Parameter description for the positioning behavior: See
“Specifying the Positioning Behavior of the PLANE
Function,” page 468.