Please Note While Programming - HEIDENHAIN TNC 620 User Manual

5
Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling
5.8 CIRCULAR STUD (cycle 258, DIN/ISO: G258)

Please note while programming:

Before the start of the cycle you will have to
preposition the tool on the machining plane. In order
to do so, move the tool with radius compensation R0
to the center of the stud.
The TNC automatically pre-positions the tool in the
tool axis. Note the 2nd set-up clearance Q204.
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program
DEPTH=0, the cycle will not be executed.
The TNC reduces the infeed depth to the LCUTS tool
length defined in the tool table if the tool length is
shorter than the Q202 infeed depth programmed in
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
entered. This means that the tool moves at rapid
traverse in the tool axis to set-up clearance
the workpiece surface!
The TNC performs an approaching motion in this
cycle! Depending on the rotary position Q224, the
following amount of space must be left next to
the stud: At least tool diameter + 2mm. Danger of
collision!
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. The end position of the tool
after the cycle differs from the starting position!
164
positive depth is
below
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 9/2015