HEIDENHAIN TNC 320 (34055x-06) Cycle programming - Manual (Page 68)

Fixed Cycles: Drilling
3.5 BORING (Cycle 202, DIN/ISO: G202)
3
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TNC 320 | User's Manual Cycle Programming | 5/2013
Please note while programming:
Machine and TNC must be specially prepared by the
machine tool builder for use of this cycle.
This cycle is effective only for machines with servo-
controlled spindle.
Program a positioning block for the starting point
(hole center) in the working plane with radius
compensation
R0.
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program
DEPTH=0, the cycle will not be executed.
After the cycle is completed, the TNC restores the
coolant and spindle conditions that were active
before the cycle call.
Danger of collision!
Use the machine parameter displayDepthErr to
define whether, if a positive depth is entered, the
TNC should output an error message (on) or not (off).
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!
Select a disengaging direction in which the tool
moves away from the edge of the hole.
Check the position of the tool tip when you program
a spindle orientation to the angle that you enter in
Q336 (for example, in the Positioning with Manual
Data Input mode of operation). Set the angle so that
the tool tip is parallel to a coordinate axis.
During retraction the TNC automatically takes an
active rotation of the coordinate system into account.