HEIDENHAIN MANUALplus 4110 Pilot - Manual (Page 62)

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Clearance cycle group
Longitudinal contour roughing G817 / G818
Transverse contour roughing G827 / G828
G817/G818 and G827/G828 machine (rough) the contour area described
by the current tool position and the data defined in the subsequent
blocks – without plunge-cutting.
Tool position at end of cycle:
• For G817/G827: at cycle starting point and last retraction coordinate
• For G818/G828: at cycle starting point
Parameters
X/Z:
Cutting limit (X as diameter value)
P: Maximum approach – Maximum infeed distance
H: Type of departure – default: 1
• 0: Machine contour outline after each pass
• 1: Retract at 45°; machine contour outline after last pass
• 2: Retract at 45° – do not machine contour outline
I, K: Oversizes – default: 0
• Descending contour elements will not be machined.
• Cutter radius compensation: is carried out
• Oversizes: G57/G58 oversizes are taken into consideration
if I and K are not given in the cycle. The oversizes are
deleted upon cycle completion.
• In the parameter “Active Parameters – Machining – Safety
distances“, you can change the safety distance which is
taken into account after each pass.
Example: Longitudinal roughing cycle G817
Example: Transverse roughing cycle G828