Please Note While Programming - HEIDENHAIN TNC 620 User Manual

5
Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling
5.6 RECTANGULAR STUD (Cycle 256)

Please note while programming:

Pre-position the tool in the machining plane to the
starting position with radius compensation R0. Note
parameter Q367 (position).
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!
Depending on the approach position Q439, leave
enough room next to the stud for the approach
motion. At least tool diameter + 2 mm.
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!
156
positive depth is
below
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 9/2015