Please Note While Programming - HEIDENHAIN TNC 620 User Manual

Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling | CIRCULAR SLOT (Cycle 254, DIN/ISO: G254,
software option 19)

Please note while programming:

With an inactive tool table you must always plunge
vertically (Q366=0) because you cannot define a
plunging angle.
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. Observe Q204 2ND SET-UP CLEARANCE.
The position at cycle end must not match the position
at cycle start. If you define a slot position not equal to
0, then the TNC only positions the tool in the tool axis
to the 2nd set-up clearance. After the cycle, program an
absolute position in all reference axes. Do not program
incremental dimensions directly after the cycle. Danger
of collision!
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program
DEPTH=0, the cycle will not be executed.
If the slot width is greater than twice the tool diameter,
the TNC roughs the slot correspondingly from the inside
out. You can therefore mill any slots with small tools,
too.
The slot position 0 is not allowed if you use Cycle 254
Circular Slot in combination with Cycle 221.
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.
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 10/2017
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