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Contour train data (cycle 270), 8 sl c y cles – HEIDENHAIN iTNC 530 (340 49x-04) User Manual

Page 463

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HEIDENHAIN iTNC 530

463

8.8 SL c

y

cles

CONTOUR TRAIN DATA (Cycle 270)

If desired, you can use this cycle to specify various properties of
Cycle 25, 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 comp. (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 CYCL DEF 25 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 270 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 25.