Tweco iCNC XT - Manual (Page 97)

iCNC XT
Manual 0-5299 OPERATION 5-39
5.13.5. Cutting Parameters
Cutting speed
This is the machine cutting speed. This setting duplicates the cutting speed setting in folder 1 Parameters. Changing one, changes the other.
Rapid speed
The machine speed during a non-cutting or rapid traverse move.
Creep speed
The initial speed of the cutting torch immediately after the start command is given. The duration of this speed is determined by the setting of
the Creep Time parameter. This ‘ramp-up” speed is used only shortly, to assist with piercing. After the creep time is over the torch accelerates
up to the normal cutting speed.
Creep time
Length of the time limit for using the creep speed.
Prestop distance
With this parameter you can switch off the plasma slightly before the end of the programmed cut. This parameter is used with plasma power
sources which ramp down the current at the end of a cut cycle. Prestop allows the plasma to shut off just prior to the program completing
motion. As the power supply ramps down, the arc remains on long enough to fi nish the cut preventing dimpling and extending consumable life.
NOTE:
This feature must be enabled in the I/O before it will function. Typical values range from .040 to .1 inches.
SD1 is generally used for a primary torch down time, usually in conjunction with an automatic capacitive height sensor to lower the torch to the
correct piercing height above the material. It can be used without a height sensor, but it is important to remember that the torch will fi rst lower
to the material once the sequence is started. To override this function set the timer value for SD1 to zero.
SD2 provides a time for igniting the torch. The ignition output is activated for this user selectable time. After time has elapsed the igniter will
turn off. To override the feature in the event that the machine is not equipped with auto ignition, set timer value for SD2 to zero.
SD3 is generally used for a high preheat timer. This determines the time allocated for preheating the material before piercing. The time is user
defi ned based on the type of material and thickness. The thicker the material, the higher the timer value. To override the feature in the event that
the machine is not equipped with auto high preheat, set timer value for SD3 to zero.
SD4 Is generally used for Cut Oxygen. This determines the time allocated for heating the material with cutting oxygen, normally with thicker
materials. Best Used with the pierce Up/Down function (See below).To override the feature in the event that the machine does not need extra
pierce with cutting oxygen, set timer value for SD4 to zero.
Pierce up/down event timing: Activating the feature.