Siemens SINUMERIK 840D Programming Manual page 131

3
12.97
Sequence of operations
Position reached prior to cycle start:
The starting position can be any position from which
each of the elongated holes can be approached
without collision.
The cycle implements the following motion
sequence:
• The starting position of a cycle is approached
with G0. The nearest end point of the first
elongated hole to be machined is approached in
both axes of the current plane at the retraction
plane level in the applicate of this plane and then
lowered in the applicate to the reference plane
brought forward by the safety distance.
• Each elongated hole is milled in a reciprocating
movement. Machining is performed in the plane
with G1 and the feedrate programmed under
FFP1. At each reversal point, the infeed to the
next machining depth calculated by the cycle is
performed with G1 and the feedrate FFD until the
final depth is reached.
• Retraction to the retraction plane with G0 and
approach to the next elongated hole along the
shortest path.
• When the last elongated hole has been
machined, the tool is traversed from the last
position reached in the machining plane to the
retraction plane with G0 and the cycle is
terminated.
© Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
3.4 Elongated holes on a circle – LONGHOLE
3
Milling Cycles
3-131