Path functions...................................................................................................................................... 272

FK free contour programming (option 19)........................................................................................... 272

Miscellaneous functions M..................................................................................................................272

Subprograms and program section repeats........................................................................................ 273

Programming with Q parameters........................................................................................................ 273

7.2

Fundamentals of path functions...................................................................................................... 274

Programming tool movements for workpiece machining.................................................................... 274

7.3

Approaching and departing a contour............................................................................................ 278

Starting point and end point................................................................................................................ 278

Overview: Types of paths for contour approach and departure...........................................................280

Important positions for approach and departure................................................................................. 281

Approaching on a straight line with tangential connection: APPR LT.................................................. 283

Approaching on a straight line perpendicular to the first contour point: APPR LN.............................. 283

Approaching on a circular path with tangential connection: APPR CT.................................................284

Approaching on a circular path with tangential connection from a straight line to the contour:

APPR LCT............................................................................................................................................. 285

Departing in a straight line with tangential connection: DEP LT......................................................... 286

Departing in a straight line perpendicular to the last contour point: DEP LN...................................... 286

Departing on a circular path with tangential connection: DEP CT.......................................................287

Departing on a circular arc tangentially connecting the contour and a straight line: DEP LCT.............287

Path contours  Cartesian coordinates.......................................................................................... 288

7.4

Overview of path functions................................................................................................................. 288

Straight line L.......................................................................................................................................289

Inserting a chamfer between two straight lines..................................................................................290

Rounded corners RND......................................................................................................................... 291

Circle center CC...................................................................................................................................292

Circular path C around circle center CC.............................................................................................. 293

Circle CR with defined radius.............................................................................................................. 294

Circle CT with tangential connection...................................................................................................296

Example: Linear movements and chamfers with Cartesian coordinates............................................. 297

Example: Circular movements with Cartesian coordinates................................................................. 298

Example: Full circle with Cartesian coordinates.................................................................................. 299

7.5

Path contours - Polar coordinates................................................................................................... 300

Overview.............................................................................................................................................. 300

Datum for polar coordinates: pole CC................................................................................................. 301

Straight line LP.....................................................................................................................................301

Circular path CP around pole CC.........................................................................................................302

Circle CTP with tangential connection.................................................................................................302

Helix......................................................................................................................................................303

HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2017

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