HEIDENHAIN TNC 128 (77184x-01) - Manual (Page 432)

432 Fixed cycles: Pocket milling / stud milling / slot milling
1
7.3 RECT
ANGULAR S
T
UD (Cy
c
le
256)
17.3 RECTANGULAR STUD
(Cycle 256)
Cycle run
Use Cycle 256 to machine a rectangular stud. If a dimension of the
workpiece blank is greater than the maximum possible stepover, then
the TNC performs multiple stepovers until the finished dimension has
been machined.
1 The tool moves from the cycle starting position (stud center) in the
negative X direction to the starting position for stud machining. The
starting position is to the left of the unmachined stud and is offset
by the set-up clearance + tool radius.
2 If the tool is at the 2nd set-up clearance, it moves at rapid traverse
FMAX to the set-up clearance, and from there it advances to the
first plunging depth at the feed rate for plunging.
3 The tool then moves to the stud contour and machines one
revolution.
4 If the finished dimension cannot be machined with one revolution,
the TNC performs a stepover with the current factor, and
machines another revolution. The TNC takes the dimensions of the
workpiece blank, the finished dimension, and the permitted
stepover into account. This process is repeated until the defined
finished dimension has been reached.
5 The tool then departs the contour and returns to the starting point
of stud machining.
6 The TNC then plunges the tool to the next plunging depth, and
machines the stud at this depth.
7 This process is repeated until the programmed stud depth is
reached.
X
Y