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5
Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling
5.7
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. Pay attention to 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!
Enter in machine parameter displayDepthErr
whether the TNC should output an error message
(on) or not (off) if a positive depth is entered.
Keep in mind that the TNC reverses the calculation
for pre-positioning when a
entered.
traverse in the tool axis to set-up clearance
the workpiece surface!
The TNC performs an approach motion in this cycle!
Depending on the starting angle Q376, the following
amount of space must be left next to the stud: At
least tool diameter + 2 mm. 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!
Enter a starting angle between 0° and 360° in
parameter Q376 in order to determine the exact
starting position. If you use the default value -1 the
TNC automatically calculates the most favorable
starting position. These may vary
156
positive depth is
This means that the tool moves at rapid
below
HEIDENHAIN | TNC 320 | User's manual for cycle programming | 9/2016
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