R-Specified Circular Interpolation; G02, G03 - Mitsubishi Electric MELDAS C6 Programming Manual

6. Interpolation Functions

6.5 R-specified circular interpolation; G02, G03

Function and purpose
Along with the conventional circular interpolation commands based on the arc center coordinate (I,
J, K) designation, these commands can also be issued by directly designating the arc radius R.
Command format
G02 (G03) Xx Yy Rr Ff ;
x
y
r
f
The arc radius is commanded with an input setting unit. Caution is required for the arc command of
an axis for which the input command value differs. Command with a decimal point to avoid
confusion.
Detailed description
The arc center is on the bisector line which is perpendicular to the line connecting the start and end
points of the arc. The point, where the arc with the specified radius whose start point is the center
intersects the perpendicular bisector line, serves as the center coordinates of the arc command.
If the R sign of the commanded program is plus, the arc is smaller than a semisphere; if it is minus,
the arc is larger than a semisphere.
The following condition must be met with an R-specified arc interpolation command:
L/(2xr) ≤ 1
Where L is the line from the start point to end point.
When the R specification and I, J, K specification are contained in the same block, the R
specification has priority in processing.
When the R specification and I, J, K specification are contained in the same block, the R
specification has priority in processing.
The plane selection is the same as for the I, J, K-specified arc command.
: X-axis end point coordinate
: Y-axis end point coordinate
: Arc radius
: Feedrate
Start point
An error will occur when L/2 - r > (parameter : #1084 RadErr)
6.5 R-specified circular interpolation
02 End point
Center
point
Center point
Arc path when
R sign is plus
Center point
L
01
r
39
Arc path when
R sign is minus