Siemens SINUMERIK 840D Programming Manual page 190

3
Milling Cycles
3.13 Milling rectangular spigots – CYCLE76 (SW 5.3 and higher)
Function
With this cycle you can machine rectangular spigots
in the machining plane. For finishing, a face cutter is
needed. Depth infeed is always performed in the
position reached prior to semicircular positioning on
the contour.
Sequence of operations
Position reached prior to cycle start:
The starting point is a position in the positive range of
the abscissa with integrated approach semicircle and
allowance for programmed, abscissa-related blank
dimension.
Sequence of motions for roughing (_VARI=1)
Approach to and exit from contour:
The retraction plane (_RTP) is approached in rapid
traverse so that the tool can be positioned from there on
the starting point in the machining plane. The starting
point is defined as being 0 degrees in relation to the
abscissa.
The tool is fed in at rapid traverse to the safety distance
(_SDIS) and then traverses to machining depth at
normal feedrate. The tool approaches the spigot
contour along a semicircular path.
The milling direction can be defined as up-cut or down-
cut milling in relation to the spindle direction.
If the spigot has been circumnavigated once, the tool
lifts off the contour in the plane along a semicircular
path and is then fed in to the next machining depth.
The contour is then approached again along a
semicircle and the spigot circumnavigated once. This
process is repeated until the programmed spigot depth
is reached. The tool then approaches the retraction
plane (_RTP) in rapid traverse.
3-190
Approach to and retraction from the contour in a
semicircle with spindle rotating clockwise and
climb milling
Y
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition
3
12.97
04.00
Approach to contour
X
Retraction from contour
© Siemens AG, 2002. All rights reserved