HEIDENHAIN TNC 406 - Manual (Page 162)

HEIDENHAIN TNC 406, TNC 416 141
8.4 Er
osion Cy
cles
Spark-out mode SPO
The spark-out mode SPO determines the manner and duration of the
spark-out.
„ SPO = 0: Fast sparking-out
Spark-out depends on the end radius and machine parameter
MP2110, or, if Cycle 4 SPARK-OUT is defined, on the parameters in
Cycle 4.
„
SPO = 1: Sparking-out
Spark-out begins when the end radius has been reached, and the
electrode has been in free run for 1.25 orbits.
Feed rates for eroding with Cycle 14 ORBIT
The feed rate for rotary motion is the same as the last-programmed
feed rate. It is limited by user parameters MP1092 to MP1097.
The feed rate in the tool axis direction is determined by the gap
control.
Standard behavior with short circuit
In the event of a short circuit, the electrode is stopped and retracted
along the infeed vector.
Once the short circuit is eliminated, the TNC moves the electrode back
along the infeed vector toward the workpiece but stops a certain
distance before the point where the short circuit occurred (this
distance is defined in parameter MP2050).
The machine tool builder may have specified a different
retraction behavior in the event of short circuiting than is
described here.
Refer to your machine tool manual.