HEIDENHAIN TNC 406 - Manual (Page 86)

HEIDENHAIN TNC 406, TNC 416 65
4.7 P
ar
amet
ers in the Er
osion T
able
Pulse-on duration and pulse-off duration
The pulse-on duration (TON) is the time in which the generator
applies a voltage to the electrode and workpiece.
Ignition and subsequent discharge take place during this time.
The pulse-off duration (TOF) is the time in which no voltage is
generated.
During this time the gap is flushed and deionized.
Select the TON/TOF ratio according to the type of machining:
Setting
„ Roughing: Long pulse-on duration, short pulse-off duration
„
Finishing and polishing: Short pulse-on duration, long pulse-off
duration
Servo sensitivity SV
The servo sensitivity influences the reaction speed of the gap control.
Setting
„ High servo sensitivity: fast gap control
„ Low servo sensitivity: slow gap control
Input range
0 to 99 %
Erosion time ET, Auto jump distance AJD
The erosion time determines how long an erosion step lasts. When
the programmed erosion time has run out, the electrode retracts by
the auto jump distance and subsequently returns to the position
given in machine parameter MP2051.
Intermittent flushing
To improve deionization of the gap and flush away debris, you can
activate miscellaneous function M8 (intermittent flushing ON).
U gap
F
SV= 99
SV= 60
2
t
U
T- ON TF
1
t
U
T- ON TF
ET
AJD
ET
AJD
MP 2051
The machine tool builder specifies a characteristic curve
for servo sensitivity (see figure center right). Refer to your
machine tool manual.