6. Interpolation Functions
6.13 Spiral/Conical Interpolation
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6.13 Spiral/Conical Interpolation; G02.0/G03.1(Type1), G02/G03(Type2)
Function and purpose
This function carries out interpolation that smoothly joins the start and end points in a spiral. This
interpolation is carried out for arc commands in which the start point and end point are not on the
same circumference.
There are two types of command formats, and they can be switched with the parameters.
Command format
G17 G02.1/G03.1 X__ Y__ I__ J__ P__ F__ ; (Type 1: #1272 ex08/bit2=0)
G17 G02/G03 X__ Y__ I__ J__ Q__/L__/K__ F__ ; (Type 2: #1272 ex08/bit2=1)
G17 :
Rotation
plane
G02.1/G03.1 (Type 1)
: Arc rotation direction (Type 1)
G02/G03 (Type 2)
: Arc rotation direction (Type 2)
X Y
: End point coordinates (Conical Interpolation when the axis other
than rotation plane axes is included.)
I J
: Arc center
P
: Number of pitches (number of rotations) (Type 1)
Q/L/K (Type 2)
: Incremental/decremental amount of radius /Number of
pitches(Number of spirals)/ Increment/decrement amount of
height (Type 2)
F
: Feedrate (tool path direction speed)
Circular interpolation operations are carried out at the f1 speed by the commands above.
The path is toward the end point, following a spiral arc path centered at the position designated by
distance i (X axis direction) and distance j (Y axis direction) in respect to the start point.
(1) The arc plane is designated by G17, G18 and G19. (Common for type 1 and 2)
G17 · · · · XY plane
G18 · · · · ZX plane
G19 · · · · YZ plane
(2) The arc rotation direction is designated by G02.1(G02) or G03.1(G03). (Common for type 1
and 2)
G02.1(G02) · · · Clockwise (CW)
G03.1(G03) · · · Counterclockwise (CCW)
(3) The end point coordinates are designated with XYZ. (Common for type 1 and 2)
(Decimal point command is possible. Use mm (or inch) as the unit).
When designation of arc plane axes is omitted, the coordinates of the start point are inherited.
If the axis other than arc plane axes is designated, conical interpolation is applied.
(4) The arc center is designated with IJK. (Common for type 1 and 2)
(Decimal point command is possible. Use mm (or inch) as the unit.)
I : Incremental designation in the X axis direction from the start point
J : Incremental designation in the Y axis direction from the start point
K : Incremental designation in the Z axis direction from the start point
When either 1 axis of arc plane is omitted, the coordinates of the start point are inherited.