You use the CTP function to program a circular path with polar coordinates that connects tangentially to the previously programmed contour element.
Application
Requirements
- Pole CC
- Previous contour element programmed
You must define a pole CC before programming with polar coordinates.
Polar coordinate datum at pole CC
Before you can program a circular path with CTP you must program a contour element to which the circular path can connect tangentially. This requires at least two positioning blocks.
Description of function

The control moves the tool on a circular path, with a tangential connection, from the current position to the end point defined with polar coordinates. The starting point is the end point of the preceding NC block.
When contour elements uniformly merge into another, without kinks or corners, then this transition is referred to as tangential.
Programming a circular path CTP
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Notes
- The pole is not the center of the contour circle!
- The Form column allows toggling between the syntaxes for Cartesian and polar coordinate entry.
Example
12 L X+0 Y+35 RL F250 M3 |
13 CC X+40 Y+35 |
14 LP PR+25 PA+120 |
15 CTP PR+30 PA+30 |
16 L Y+0 |