Rectangular stud (cycle 256) – HEIDENHAIN iTNC 530 (340 49x-04) User Manual
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8 Programming: Cycles
8.6 Cy
cles f
o
r Milling P
o
c
k
ets, St
uds and Slots
RECTANGULAR STUD (Cycle 256)
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 the 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 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
Before programming, note the following
Pre-position the tool in the machining plane to the starting
position with radius compensation R0. Note Parameter
Q367 (stud position).
The TNC automatically pre-positions the tool in the tool
axis. Note Parameter Q204 (2nd set-up clearance).
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program
DEPTH = 0, the cycle will not be executed.
At the end, the TNC positions the tool back to the set-up
clearance, or to the 2nd set-up clearance if one was
programmed.