Refer to your machine manual.
Machine and control must be specially prepared by the machine manufacturer for use of this cycle.
Option 50 must have been enabled.

The pre-positioning of the tool has a decisive influence on the workspace of the cycle and thus the machining time. During roughing, the starting point for cycles corresponds to the tool position when the cycle is called. When calculating the area to be machined, the control takes into account the starting point and the end point defined in the cycle or of the contour defined in the cycle. If the starting point is within the area to be machined, then the control positions the tool at the set-up clearance beforehand in some cycles.
The direction of stock removal is longitudinal to the rotary axis for Cycles 81x and transverse to the rotary axis for Cycles 82x. In Cycle 815, the movements are contour-parallel.
The cycles can be used for inside and outside machining. The control takes the information for this from the position of the tool or from the definition in the cycle.
For cycles in which a defined contour is machined (Cycles 810, 820, and 815), the direction set when programming the contour determines the machining direction.
In cycles for turning you can specify the machining strategies of roughing, finishing or complete machining.
- Position the tool at a sufficient distance from the starting point to prevent the possibility of contour damage
- If the tool is outside the envelope contour, positioning to the envelope contour is performed at rapid traverse, and at the programmed feed rate within the envelope contour.
The control monitors the length of the cutting edge CUTLENGTH in the turning cycles. If the cutting depth programmed in the turning cycle is greater than the length of the cutting edge defined in the tool table, then the control issues a warning. In this case, the cutting depth will be reduced automatically in the machining cycle.