HEIDENHAIN iTNC 530 (340 422) ISO programming - Manual (Page 295)

HEIDENHAIN iTNC 530 295
8.4 Cy
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CIRCULAR SLOT (Cycle G254)
Use Cycle G254 to completely machine a circular slot. Depending on
the cycle parameters, the following machining alternatives are
available:
n Complete machining: Roughing, floor finishing, side finishing
n
Only roughing
n Only floor finishing and side finishing
n Only floor finishing
n
Only side finishing
Roughing process
1 The tool moves in a reciprocating motion at the plunging angle
defined in the tool table to the first infeed depth. If space permits,
the TNC plunges helically instead of reciprocatingly. Specify the
plunging strategy with Parameter Q366.
2 The TNC roughs the slot at the active infeed depth.
3 This process is repeated until the slot depth is reached.
Finishing process
4 If finishing allowances have been defined, the TNC first roughs the
slot floor. The slot floor is approached tangentially.
5 The TNC then finishes the slot walls, in multiple infeeds if so
specified. The slot side is approached tangentially.
Before programming, note the following:
Pre-position the tool in the machining plane with radius
compensation R0. Define Parameter Q367 (Reference
for slot position)
appropriately.
The TNC runs the cycle in the axes (machining plane) with
which you approached the starting position. For example,
in X and Y if you programmed G79:G01 X... Y... or in U
and V if you programmed G79:G01 U... V...
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.