OPERATION
4-12
CommandTHC for X-Y Table
Instruction Manual
5
Pierce height factor for thicker materials
General:
When cutting materials 3/4 inch (19 mm) or thicker, the torch may contact the molten metal
accumulated on top of the plate during piercing. See Figure 4-5. To avoid this, the cut height and
pierce height factor can be set so that the torch will jump over the molten metal after piercing is
completed.
When to apply:
If the torch dives into the molten metal accumulated on top of the plate during piercing.
Do not apply if this problem is not encountered during piercing.
Application:
Set the cut height to 2X the desired pierce height and enter a pierce height factor of 50%.
(These are initial settings which may be adjusted to obtain cut improvements.) After the pierce
delay, the torch will retract to the cut height for Machine Acceleration Delay (clearing the molten
metal) and then Automatic Voltage Control (AVC) will take over. See Figure 4-6 for sequence of
events.
EXAMPLE:
Desired Pierce Height
=
0.25 inch
Cut Height
= 0.500 inch
Pierce Height Factor
= 50%
0.500 inch X 50% = 0.250 inch*
Pierce Height
=
0.250 inch
*THC system performs this calculation.
Figure 4-4 Typical pierce height factor – sequence of events
EVENT
1
2
4
Pierce Height
Pierce Delay
3
Plate
5
Machine
Acceleration
Delay
Automatic
Voltage
Control
Plate
Cut Height
Plate
