Brother TC-32B - Spiral Interpolation (G02, G03)

TC-32B Chapter 3 Preparation Function
2004/01/22 3 - 21 eTCOMNCPR3.doc
3
3.4.3 Spiral interpolation (G02, G03)
An increment or decrement per rotation is specified for the circular interpolation command to
perform spiral interpolation.
Command format
X-Y plane:
{G17}G02X_Y_I_J_Q_L_F_;
{G17}G03X_Y_I_J_Q_L_F_;
Z-Y plane:
{G18}G02Z_X_K_I_Q_L_F_;
{G18}G03Z_X_K_I_Q_L_F_;
Y-Z plane:
{G19}G02Y_Z_J_K_Q_L_F_;
{G19}G03Y_Z_J_K_Q_L_F_;
G02 : Clockwise cutting direction
G03 : Counterclockwise cutting direction
XYZ : Coordinates of end point
L : Number of rotations (positive value, decimal numbers are rounded up to the nearest
whole number). Add a decimal point, rounded off.
Example: Set "L6" for five and 1/4 rotations (5.25 rotations).
Q : Increment or decrement in radius per rotation
Setting a positive value increases the radius for each rotation.
Setting a negative value decreases the radius for each rotation.
IJK : Vector (distance and direction) from the start point to the center (the same as
circular interpolation)
F : Cutting speed
(Note)
Either L (number of rotations) or Q (increment/decrement in radius) can be omitted.
If there is a discrepancy between "L" and "Q" when used together, "Q" is used.
Y
X
20
20
100
-
-50
Start point (0,100)
End
p
oint
(
X,Y
)(
0,-50.
)
Distance to the center
(
I,J
)(
0,-100.
)
Increment/decrement in radius Q –20.0
No. of rotations L 3
Absolute command
1) G90G02X0.Y-50.I0J-100.Q-20．；
2) G90G02X0.Y-50.I0J-100.L4;
Incremental command
1) G91G02X0Y-150.I0J-100.Q-20.；
2) G91G02X0Y-150.I0J-100.L4
Setting either 1) or 2) is acceptable.