# Round tube, projection

With projected round tube machining, the programmed X/Y path is mapped by parallel projection onto the lateral surface of a tube. The distance from the tube (Z height) is kept constant by transformation on the curved tube. If the distance is changed, a Z height change can be additionally programmed.

Machining is possible up to a programmable radius limit. This value is always less than the tube radius. Machining is aborted if a position outside this limit is programmed. This results in an error message.

Before selecting the transformation, the tube must be positioned so that the Y axis is within the set limit 'LIMIT' (see NC command #CYL [...]).

The specified feed rate refers to the original path programmed. Especially in the edge zone of the tube, the real feed rate of the tool in the round tube is higher.

Programming with path projection

## Additional information

- Programming #CYL [RADIUS..]
- Axis configuration
- Path example