Siemens SINUMERIK 840D Programming Manual page 114

Milling Cycles 03.96
3 3
3.4 Elongated holes on a circle - LONGHOLE
Function
Elongated holes arranged on a circle can be
machined with this cycle. The longitudinal axis of the
elongated holes is arranged radially.
Unlike the slot, the width of the elongated hole is
determined by the diameter of the tool.
To avoid unnecessary travel, the cycle calculates the
most optimum path. If several depth infeed
movements are required to machine an elongated
hole, the infeed is performed at alternate end points.
The path to be traversed in the plane along the
longitudinal axis of the elongated hole changes
direction after every infeed. The cycle automatically
looks for the shortest path when changing to the
next elongated hole.
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SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition