HEIDENHAIN TNC 426 (280 476) Pilot User Manual

Page 52

Cycles

for

Machining

Holes

and

Threads

THREAD DRILLING AND MILLING (264)

Pre-position over the hole center with R0

CYCL DEF: Select Cycle 264 THREAD DRLLNG/MLLNG

Nominal diameter of 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

Hole depth: Distance from top of workpiece to bottom of hole: Q201

Feed rate for pre-positioning: Q253

Type of milling: Q351

Climb: +1

Up-cut: 1

Plunging depth: Q202

Upper advanced stop distance: Q258

Infeed depth for chip breaking: Q257

Retraction distance for chip breaking: Q256

Dwell time at bottom: Q211

Sinking depth at front: Q358

Countersinking offset at front: Q359

Set-up clearance: Q200

Workpiece surface coordinate: Q203

2nd set-up clearance: Q204

Feed rate for plunging: Q206

Feed rate for milling: Q207

Q203

Q239

Q201

Q204

Q200

Q253

Q202

Q257

Q356

Q359

Q358

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