beautypg.com

HEIDENHAIN TNC 426 (280 476) Pilot User Manual

Page 51

background image

52

Cycles

for

Machining

Holes

and

Threads

THREAD MILLING AND COUNTERSINKING (263)

Pre-position above the hole center with R0

CYCL DEF: Select Cycle 263 THREAD MILLING AND

COUNTERSINKING

Nominal diameter of thread: Q335

Thread pitch: Q239

The algebraic sign determines the direction of the thread:

• Right-hand thread: +

• Left-hand thread: –

Thread depth: Distance from top of workpiece to thread

termination: Q201

Countersinking depth: Distance from workpiece surface to bottom

of hole: Q356

Feed rate for pre-positioning: Q253

Type of milling: Q351

• Climb: +1

• Up-cut: –1

Set-up clearance: Q200

Lateral set-up clearance: Q357

Sinking depth at front: Q358

Countersinking offset at front: Q359

Workpiece surface coordinate: Q203

2nd set-up clearance: Q204

Feed rate for counterboring: Q254

Feed rate for milling: Q207

X

Z

Q203

Q239

Q201

Q204

Q200

Q253

Q356

X

Z

Q359

Q357

Q358