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5
CIRCULAR STUD (Cycle 257, DIN/ISO: G257)
5.7
Cycle parameters
Q223 Finished part diameter?: Diameter of
the completely machined stud. Input range 0 to
99999.9999
Q222 Workpiece blank diameter?: Diameter of
the workpiece blank. Enter the workpiece blank
diameter greater than the finished diameter. The
TNC performs multiple stepovers if the difference
between the workpiece blank diameter and finished
diameter is greater than the permitted stepover (tool
radius multiplied by path overlap Q370). The TNC
always calculates a constant stepover. Input range 0
to 99999.9999
Q368 Finishing allowance for side? (incremental):
Finishing allowance in the machining plane Input
range 0 to 99999.9999
Q207 Feed rate for milling?: Traversing speed of
the tool in mm/min during milling. Input range 0 to
99999.999 alternatively FAUTO, FU, FZ
Q351 Direction? Climb=+1, Up-cut=-1: Type of
milling operation with M3:
+1 = Climb
–1 = Up-cut
PREDEF: The TNC uses the value from the GLOBAL
DEF block (if you enter 0, climb milling is performed)
Q201 Depth? (incremental): Distance between
workpiece surface and bottom of stud. Input range
-99999.9999 to 99999.9999
Q202 Plunging depth? (incremental): Infeed per
cut; enter a value greater than 0. Input range 0 to
99999.9999
Q206 Feed rate for plunging?: Traversing speed of
the tool in mm/min when plunging to depth. Input
range 0 to 99999.999; alternatively FMAX, FAUTO,
FU, FZ
Q200 Set-up clearance? (incremental): Distance
between tool tip and workpiece surface Input range
0 to 99999.9999; alternatively PREDEF
157
HEIDENHAIN | TNC 320 | User's manual for cycle programming | 9/2016
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