Please Note While Programming - HEIDENHAIN TNC 640 User Manual

5
Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling | CIRCULAR STUD (Cycle 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. Observe 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.
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!
If you enter a positive depth with a cycle, the TNC reverses
calculation of the pre-positioning. This means that the tool
moves at rapid traverse in the tool axis to set-up clearance
below the workpiece surface!
Enter depth as negative
Enter in machine parameter displayDepthErr (No. 201003)
whether the TNC should output an error message (on) or not
(off) if a positive depth is entered
Danger of collision!
There is a danger of collision if there is insufficient room next to
the stud.
The TNC performs an approach motion with this cycle
To define the precise starting position, enter a starting angle
of 0° to 360° in parameter Q376
Depending on the starting angle Q376, the following amount
of space must be left next to the stud: At least tool diameter
+2 mm
If you use the default value -1 the TNC automatically
calculates the starting position
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NOTICE
NOTICE
HEIDENHAIN | User's manual for cycle programming | 10/2017