Circle With Tangential Transition: Ct; Thread Cutting; Thread Cutting With Constant Lead: G33 - Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual

See the following illustration for circle with end point and intermediate point specification:
Programming example
N5 G90 Z30 X40
N10 CIP Z50 X40 K1=40 I1=45
8.4.3

Circle with tangential transition: CT

Functionality
With CT and the programmed end point in the current plane (G18: Z/X plane), a circle is produced which tangentially
connects to the previous path segment (circle or straight line).
This defines the radius and center point of the circle from the geometric relationships of the previous path section and the
programmed circle end point.
See the following illustration for circle with tangential transition to the previous path section:
8.5

Thread cutting

8.5.1

Thread cutting with constant lead: G33

Functionality
The function G33 can be used to machine threads with constant lead of the following type:
● Thread on cylindrical structures
● Thread on tapered structures
● External thread
● Single- and multiple-start thread
● Multi-block thread (series of threads)
This requires a spindle with position measuring system.
G33 remains active until canceled by another instruction from this G group (G0, G1, G2, G3...).
Programming and Operating Manual (Turning)
6FC5398-5DP10-0BA2, 06/2015
; Starting point circle for N10
; End point and intermediate point
75