HEIDENHAIN iTNC 530 (34049x-08) Cycle programming - Manual (Page 164)

164 Fixed cycles: pocket milling / stud milling / slot milling
5.6
RECT
ANGULAR
S
T
UD
(Cy
cle
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) to the
starting position for stud machining. Specify the starting position
with parameter Q437. The standard setting (Q437=0) lies 2 mm to
the right next to the stud blank
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 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. If you have set the starting
point on a corner (Q437 not equal to 0), the TNC mills on a spiral
path from the starting point inward until the finished dimension has
been reached
5 If further stepovers are required the tool then departs the contour
on a tangential path 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.
8 At the end of the cycle, the TNC merely positions the tool in the
tool axis at the clearance height defined in the cycle. This means
that the end position differs from the starting position.
X
Y
2mm