Siemens CNC Milling | CT | Circle with Tangential Transition

In this article, we describe how to use CT code for circle with tangential transition in Siemens CNC controlled milling (machine centre) machines with all details and examples.

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CT Code Introduction

In Siemens CNC controller, with CT code and the programmed end point in the current plane G17 through G19, a circle is generated which is connected tangentially to the previous path segment (circle or straight line) in this plane.

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.

You may be interested also:
“Siemens CNC Milling | CIP | Circular Interpolation”

See the following illustration for circle with tangential transition to the previous path section:

CT Code Example

N10 G1 X20 F300 ; Straight line
N20 CT X… Y… ; Circle with tangential connection


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