HEIDENHAIN iTNC 530 (340 49x-04) ISO programming - Manual (Page 383)

HEIDENHAIN iTNC 530 383
8.4 Cy
cles f
o
r Milling P
o
c
k
ets, St
uds and Slots
CIRCULAR STUD (Cycle 257)
Use Cycle 257 to machine a circular stud. If a diameter of the
workpiece blank is greater than the maximum possible stepover, then
the TNC performs multiple stepovers until the finished diameter 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 diameter 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 diameter, the finished diameter, and the
permitted stepover into account. This process is repeated until the
defined finished diameter 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 (stud center) with radius compensation R0.
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 of the cycle, the TNC returns the tool to the
starting position.
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.