Fixed Cycles: Drilling
3.5 BORING (Cycle 202, DIN/ISO: G202)
3
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HEIDENHAIN | TNC 320 | User’s manual for cycle programming | 9/2016
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 machining, the TNC positions the tool back at
the starting point of the machining plane. This way,
you can continue positioning incrementally.
If the functions M7 or M8 were active before calling
the cycle, the TNC will reconstruct this previous
state at the end of the cycle.
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
manl.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.
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