Siemens sinumerik 808d Programming And Operating Manual page 162

Cycles
2.5 Turning cycles
Sequence
Position reached prior to cycle start:
The starting position is any position from which the contour starting point can be approached
without collision.
The cycle creates the following sequence of motions:
The cycle starting point is calculated internally and approached with G0 in both axes at the
same time.
Roughing without relief cut elements:
● The paraxial infeed to the current depth is calculated internally and approached with G0.
● Approach of paraxial roughing intersection point with G1 and at feedrate FF1.
● Rounding parallel to the contour along the contour + finishing allowance with G1/G2/G3
● Lift-off by the amount programmed under _VRT in each axis and retraction with G0.
● This sequence is repeated until the total depth of the machining step is reached.
● When roughing without relief cut elements, retraction to the cycle starting point is carried
162
and FF1.
out axis by axis.
Turning Part 2: Programming (Siemens instructions)
Programming and Operating Manual, 05/2012, 6FC5398-5DP10-0BA0