Tormach PCNC 770 - Return to Pre-Defined Position - G30 and G30.1; Straight Probe - G38

Chapter 7
109
UM10350_PCNC770_Manual_0916A
Programming
7.5.9 Return to Pre-defined Position – G30 and G30.1
G30 uses the values stored in parameters 5181 and 5183 as the X and Z nal point to move to. The
parameter values are absolute mill coordinates in the nave machine units of inches.
G30 makes a rapid traverse move from the current posion to the absolute posion of the values
in parameters.
G30 X~ Z~ makes a rapid traverse move to the posion specied by axes including any osets,
then makes a rapid traverse move to the absolute posion of the values in parameters 5181 and/or
5183. Any axis not specied won’t move.
G30.1 stores the current absolute posion into parameters 5181-5183.
It is an error if:
• Cuer Compensaon is turned on
7.5.10 Straight Probe – G38.x
G38.2 – probe toward workpiece, stop on contact, signal error if failure
G38.3 – probe toward workpiece, stop on contact
G38.4 – probe away from workpiece, stop on loss of contact, signal error if failure
G38.5 – probe away from workpiece, stop on loss of contact
G38.6 – move away from the workpiece ignoring probe input
To perform a straight probe operaon program: G31 X~ Y~ Z~ A~
The probe will convenonally be tool #99. The rotaonal axis words are allowed, but it is beer to
omit them. If rotaonal axis words are used, the numbers must be the same as the current posion
numbers so that the rotaonal axes do not move. The linear axis words are oponal, except that at
least one of them must be used. The tool in the spindle must be a probe. It is an error if:
• The current point is less than 0.01 inch (0.254 millimeter) from the programmed point;
• G38 is used in inverse me feed rate mode;
• Any rotaonal axis is commanded to move;
• No X-, Y- or Z-axis word is used.
• Feed rate is zero
• Probe is already tripped
In response to this command, the mill moves the controlled point (which should be at the end of
the probe p) in a straight line at the current feed rate toward the programmed point; if the probe
trips, then the probe decelerates.