HEIDENHAIN TNC 426 (280 476) Pilot - Manual (Page 53)

54
Cycles
for
Machining
Holes
and
Threads
HELICAL THREAD DRILLING AND MILLING (265)
Pre-position over the hole center with R0
CYCL DEF: Select Cycle 265 HEL. THREAD DRLG/MLG
Nominal diameter of the thread: Q335
Thread pitch: Q239
The algebraic sign determines the thread direction:
• Right-hand thread: +
• Left-hand thread: –
Thread depth: Distance from top of workpiece to thread
termination: Q201
Feed rate for pre-positioning: Q253
Sinking depth at front: Q358
Countersinking offset at front: Q359
Countersink: Q360
Set-up clearance: Q200
Workpiece surface coordinate: Q203
2nd set-up clearance: Q204
Feed rate for countersinking: Q254
Feed rate for milling: Q207
X
Z
Q203
Q253
Q239
Q201
Q204
Q200
X
Z
Q359
Q358