HEIDENHAIN iTNC 530 (340 49x-04) ISO programming - Manual (Page 411)

HEIDENHAIN iTNC 530 411
8.6 SL c
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CONTOUR TRAIN DATA (Cycle 270)
If desired, you can use this cycle to specify various properties of Cycle
G125, CONTOUR TRAIN.
 Type of approach/departure Q390: Definition of the
type of approach or departure.
„ Q390 = 0:
Approach the contour tangentially on a circular arc.
„ Q390 = 1:
Approach the contour tangentially on a straight line.
„ Q390 = 2:
Approach the contour at a right angle.
 Radius compensation (0=R0/1=RL/2=RR) Q391:
Definition of the radius compensation:
„ Q391 = 0:
Machine the defined contour without radius
compensation
„ Q391 = 1:
Machine the defined contour with compensation to
the left
„ Q391 = 2:
Machine the defined contour with compensation to
the right
 Approach/departure radius Q392: Only in effect if
tangential approach on a circular path was selected.
Radius of the approach/departure arc.
 Center angle Q393: Only in effect if tangential
approach on a circular path was selected. Angular
length of the approach arc.
 Distance to auxiliary point Q394: Only in effect if
tangential approach on a straight line or right-angle
approach was selected. Distance to the auxiliary point
from which the TNC is to approach the contour.
Example: NC blocks
62 G270 CONTOUR TRAIN DATA
Q390=0 ;TYPE OF APPROACH
Q391=1 ;RADIUS COMPENSATION
Q392=3 ;RADIUS
Q393=+45 ;CENTER ANGLE
Q394=+2 ;DISTANCE
Before programming, note the following
Cycle G270 is DEF active which means that it becomes
effective as soon as it is defined in the part program.
If Cycle 270 is used, do not define any radius
compensation in the contour subprogram.
Approach and departure properties are always performed
identically (symmetrically) by the TNC.
Define Cycle 270 before Cycle G125.