HEIDENHAIN TNC 640 (34059x-01) Cycle programming - Manual (Page 148)

148 Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling
5.6 RECT
ANGULAR S
T
UD (Cy
c
le
256, DIN/ISO: G256)
5.6 RECTANGULAR STUD
(Cycle 256, DIN/ISO: G256)
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
positive X direction to the starting position for stud machining. The
starting position is 2 mm to the right of the unmachined stud.
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 tangentially on a semicircle 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 tangentially departs the contour on a semicircle and
returns to the starting point for the 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
2mm