# Open polygonal tube / profiled tube (L/U profiles)

## Release Note

This function is available as of CNC Build

V2.11.2807.01 .

## Characteristics

An extension of the definition permits the machining of non-closed profiles. An open profiled tube (L/U tube) is detected as a limited lateral surface.

There is no limitation of the path motion or modulo calculation of the PCS coordinate when "virtual edges" are crossed. For this reason, the coordinate system on a lateral surface is linear (see also linear coordinate system for round tube machining). Starting from the zero point, the lateral surface is divided into a positive and a negative direction.

Programming is always related to the closed edges of the tube profile. This means that it is possible to cross virtual edges when profile transformation is active but there is no rotation of the workpiece or Z height adjustment.

Examples of open profiles, U and L profile

Clamping examples of open rectangular profiles:

Clamping examples

## Additional information

- Programming #CYL [EDGES.. OPEN..]
- Eccentric rotation centre point
- Axis configuration