Tormach PCNC 770 - Arc at Feed Rate - G02 and G03; Radius Format Arc

Chapter 7
101
UM10350_PCNC770_Manual_0916A
Programming
7.5.3 Arc at Feed Rate – G02 and G03
A circular or helical arc is specied using either G02
(clockwise arc) or G03 (counterclockwise arc) as shown in
Figure 7.1 and Figure 7.2. The axis of the circle or helix
must be parallel to the X-, Y- or Z-axis of the mill coordinate
system. The axis (or equivalently, the plane perpendicular
to the axis) is selected with G17 (Z-axis, XY-plane), G18
(Y-axis, XZ-plane) or G19 (X-axis, YZ-plane). If the arc is
circular, it lies in a plane parallel to the selected plane.
If a line of code makes an arc and includes rotaonal axis
moon, the rotaonal axes turn at a constant rate so that
the rotaonal moon starts and nishes when the XYZ
moon starts and nishes. Lines of this sort are hardly
ever programmed.
If cuer radius compensaon is acve, the moon will
dier from the above; see Cuer Compensaon later in
this chapter.
Two formats are allowed for specifying an arc: the center
format and the radius format. In both formats the G02 or
G03 is oponal if it is the current moon mode.
7.5.3.1 Radius Format Arc
For an arc in radius format, program: G02 X~ Y~ Z~
A~ R~ (for a clockwise arc) or G03 X~ Y~ Z~ A~ R~
(for a counterclockwise arc).
Word Denition
X~ X-axis coordinate
Y~ Y-axis coordinate
Z~ Z-axis coordinate
A~ A-axis coordinate
R~ Radius of arc
In radius format, the coordinates of the end point of the arc in the selected plane are specied
along with the radius of the arc. R is the radius. The axis words are all oponal except that at least
one of the two words for the axes in the selected plane must be used. The R number is the radius.
A posive radius indicates that the arc turns through 180 degrees or less, while a negave radius
indicates a turn of 180 degrees to 359.999 degrees.
If the arc is helical, the value of the end point of the arc on the coordinate axis parallel to the axis of
the helix is also specied.
Center
Y
X
1
1
2
23
3
Figure 7.1
Center
Y
X
1
1
2
2
3
3
Cent
er
Figure 7.2
Center