HEIDENHAIN TNC 406 - Manual (Page 87)

66 4 Programming: Fundamentals, Files, Program Entry, Spark Erosion, Erosion Tables
4.7 P
ar
amet
ers in the Er
osion T
able
Arc sensitivity (AR)
The arc sensitivity setting influences the gap signal that the generator
sends to the TNC. The characteristic curve shows the nominal speed
value plotted against the gap voltage.
Electrode polarity (P)
To minimize wear on the electrode and ensure a high rate of stock
removal, you must set the correct electrode polarity.
Input value
„ Positive electrode: 0
„ Negative electrode: 1
High voltage selector HS
The high voltage is the voltage that the generator applies to the
electrode and workpiece.
Setting
„ High value for HS:
For large gaps and for high rate of stock removal.
„ Low value for HS (with ignition pulse):
For small gaps and for low rate of stock removal.
„
Low value for HS (without ignition pulse):
For a few specific hard metals and very small electrodes.
The machine tool builder can give you information on this
erosion parameter. Refer to your machine tool manual.
If you mount the electrode on the machine table, you must
change the electrode polarity defined in the machine table.
The TNC does not reverse the polarity automatically.
t
U
HS
T- ON