HEIDENHAIN iTNC 530 (34049x-08) Cycle programming - Manual (Page 169)

HEIDENHAIN iTNC 530 169
5.7 CIR
C
ULAR S
T
UD (Cy
cle 257
, DIN/ISO:
G257)
Please note while programming:
Pre-position the tool in the machining plane to the starting
position (stud center) with radius compensation R0.
The TNC automatically pre-positions the tool in the tool
axis. Note parameter Q204 (2nd set-up clearance).
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program DEPTH
= 0, the cycle will not be executed.
At the end of the cycle, the TNC returns the tool to the
starting position.
Danger of collision!
Enter in MP7441 bit 2 whether the TNC should output an
error message (bit 2=1) or not (bit 2=0) if a positive depth
is entered.
Keep in mind that the TNC reverses the calculation for pre-
positioning when a positive depth is entered. This
means that the tool moves at rapid traverse in the tool axis
to set-up clearance below the workpiece surface!
Leave enough room next to the stud for the approach
motion. Minimum: Tool diameter of + 2 mm if you are
working with standard approach radius and approach
angle.
At the end, the TNC positions the tool back to the set-up
clearance, or to the 2nd set-up clearance if one was
programmed. This means that the end position of the tool
after the cycle differs from the starting position.