Siemens Sinumerik 808D Operating Manual page 35

Create Part
Program
Part 1
Basic Theory
Milling
circles and
arcs
The circle radius shown
in the example on the
right can be produced
with the specified part
program code.
When milling circles
and arcs, you must
define the circle center
point and the distance
between the start
point / end point and
the center point on the
relative coordinate.
When working in the
XY coordinate system,
the interpolation param-
eters I and J are availa-
ble.
Two common types of defining circles and arcs:
①:G02/G03 X_Y_I_J_;
②:G02/G03 X_Y_CR=_;
Arcs ≤180º，CR is a positive number
Arcs >180º，CR is negative number
When milling circles, you can only use ① to define the
program!
808D
N5 G17 G90 G500 G71
N10 T1 D1 M6
N15 S5000 M3 G94 F300
N20 G00 X-20 Y-20 Z5
N25 G01 Z-5
N30 G41 X0 Y0
N35 Y50
N40 X100
N45 G02 X125 Y15 I-12 J-35
N50 G01 Y0
N55 X0
N60 G40 X-20 Y-20
N35 G00 Z500 D0
Note：
N45 can also be written as follows
N45 G02 X125 Y15 CR=37
Determine tool radius of T1 D1
X0, Y50
X0, Y0
SP = start point of circle
CP = center point of circle
EP = end point of circle
I = defined relative increment from start point to center point in X
J = defined relative increment from start point to center point in Y
G2 = define circle direction in traversing direction = G2 clockwise
G3 = define circle direction in traversing direction = G3 counter-
clockwise
Page 35
s
J
Y
Tool motion direction
X100, Y50
SP
(J) -35
X125, Y15
CP
(I) -12
EP
X110, Y0
Operating and Programming — Milling
I
X