Reference Point Return Checking (G27) - Adtech ADTECH9 Series Programming Manual


Note:
When change part coordinate system after moving to reference point through center point with G28 instruction,
the center point also moves to new coordinate system; when instruct G29 later, positioning at instructed
position through center point in new coordinate system.

2.2.3. Reference point return checking (G27)

Function:
This instruction makes the axis move to the position of IP instruction at the feeding speed of quick positioning,
and then checks whether this point is reference point; if yes, sends the finishing signal that this axis returns to
reference point (reference point arriving indicator of this axis is lighted); if not, gives an alarm and interrupts
the running program.
Format:
G27 X_ Y_ Z_ P_;
X YZ
P
Details:
The axes of simultaneous reference point return check are same to simultaneously controlled axes.
If the reference point isn't reached after instruction is executed, the program alarms.
Coordinate system setting function (G52-G59, G591-G599, G92)
Using preset workpiece coordinate system (G54~G59, G591~G599)
According to the loading position of the workpiece in the machine tool, this system can preset six coordinate
systems (nine extended in new version); through the operation on LCD panel, set the offset of the origin of
every workpiece coordinate system relative to the origin of machine tool coordinate system, and then use
G54~G59, G591~G599 to select, which are modal instructions, corresponding to 1#~15# preset workpiece
coordinate systems respectively.

Example:
Preset 1# workpiece coordinate system offset: X-150.000, Y-210.000, Z-90.000
Preset 4# workpiece coordinate system offset: X-430.000, Y-330.000, Z-120.000
Program
content
N1 G90 G54 G00 X50.
Y50.;
ADTECH9 Series CNC Programming Manual
indicates that reference point returns to control axis.
reference point returns number (the first reference point by default)
Coordinates
segment
point in machine tool
coordinate system
X-100, Y-160
of end
Note
Select 1# coordinate system,
quick positioning