Tormach PCNC 770 - Plane Selection - G17, G18 and G19; Return to Pre-Defined Position - G28 and G28.1

Chapter 7
108
UM10350_PCNC770_Manual_0916A
Programming
7.5.6 Plane Selection – G17, G18 and G19
To select the XY-plane as acve, program: G17 (see
Figure 7.3).
To select the XZ-plane as acve, program: G18 (see
Figure 7.4)
To select the YZ-plane as acve, program: G19
The acve plane determines how the tool path of
an arc (G02 or G03) or canned cycle (G73, G81-G89)
is interpreted.
7.5.7 Length Units – G20 and G21
To set length units to inches, program: G20
To set length units to millimeters, program: G21
It is best pracce to program either G20 or G21
near the beginning of a program, before any moon
occurs. Also, avoid using either one anywhere else in
the program. It is the responsibility of the operator
to make sure all numbers are appropriate for use
with the current length units.
7.5.8 Return to Pre-defined Position – G28 and G28.1
To make a rapid linear move to the G28.1 posion, program: G28
To make a rapid linear move to the G28.1 posion by rst going to the intermediate posion specied
by the X~, Y~, and Z~ words, program: G28 X~Y~Z~
To store the current locaon of the tool in the G28.1 seng, program: G28.1
G28 uses the values stored in parameters 5161, 5162, and 5163 as the X,Y,and Z nal points to move
to. The parameter values are absolute mill coordinates in the nave machine units of inches.
G28.1 stores the current absolute posion into parameters 5161-5163.
It is an error if:
• Cuer Compensaon is turned on
Figure 7.3
Figure 7.4