Siemens SINUMERIK 828D Programming Manual page 234

Motion commands
9.6 Circular interpolation
Significance
:
CT
X... Y... Z...
Note
is modal.
CT
As a rule, the circle is clearly defined by the tangent direction as well as the starting point
and end point.
Examples
Example 1: Milling
Program code
N10 G0 X0 Y0 Z0 G90 T1 D1
N20 G41 X30 Y30 G1 F1000
N30 CT X50 Y15
N40 X60 Y-5
N50 G1 X70
N60 G0 G40 X80 Y0 Z20
N70 M30
234
Circle with tangential transition
: End point in Cartesian coordinates
Comment
; Activation of TRC.
; Circular-path programming with tangential
transition.
Milling a circular arc with CT directly after
the straight part.
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Fundamentals