HEIDENHAIN iTNC 530 (34049x-08) Cycle programming - Manual (Page 266)

266 Fixed cycles: multipass milling
10
.4 RULED SURF
A
C
E (Cy
cle 231, DIN/ISO:
G231)
Cutting motion
The starting point, and therefore the milling direction, is selectable
because the TNC always moves from point 1 to point 2 and in the total
movement from point 1 / 2 to point 3 / 4 . You can program point 1 at
any corner of the surface to be machined.
If you are using an end mill for the machining operation, you can
optimize the surface finish in the following ways:
 A shaping cut (spindle axis coordinate of point 1 greater than
spindle-axis coordinate of point 2 ) for slightly inclined surfaces.
 A drawing cut (spindle axis coordinate of point 1 smaller than
spindle-axis coordinate of point 2 ) for steep surfaces.
 When milling twisted surfaces, program the main cutting direction
(from point 1 to point 2 ) parallel to the direction of the steeper
inclination.
If you are using a spherical cutter for the machining operation, you can
optimize the surface finish in the following way:
 When milling twisted surfaces, program the main cutting direction
(from point 1 to point 2 ) perpendicular to the direction of the
steepest inclination.
Please note while programming:
X
Y
Z
1
4
3
2
From the current position, the TNC positions the tool in a
linear 3-D movement to the starting point 1 . Pre-position
the tool in such a way that no collision between tool and
fixtures can occur.
The TNC moves the tool with radius compensation R0 to
the programmed positions.
If required, use a center-cut end mill (DIN 844).