Pierce Height Factor For Thicker Materials - Hypertherm Command THC Instruction Manual

OPERATION
EVENT
1
Pierce Height
Pierce Delay
2
3
Cut Height

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
Cut Height
Pierce Height Factor
Pierce Height
4-12
5
Plate
Plate
Figure 4-4 Typical pierce height factor – sequence of events
=
=
=
=
4
Machine
Acceleration
Delay
0.25 inch
0.500 inch
50%
0.500 inch X 50% = 0.250 inch*
0.250 inch
*THC system performs this calculation.
CommandTHC for X-Y Table Instruction Manual
Automatic
Voltage
5
Control
Plate