HEIDENHAIN TNC 640, User Manual, Page: 45 / 948

Contents
HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
45
7 Programming Contours............................................................................................................... 281
7.1 Tool movements................................................................................................................................. 282
Path functions...................................................................................................................................... 282
FK free contour programming............................................................................................................. 282
Miscellaneous functions M..................................................................................................................282
Subprograms and program section repeats........................................................................................ 283
Programming with Q parameters........................................................................................................ 283
7.2 Fundamentals of path functions...................................................................................................... 284
Programming tool movements for workpiece machining.................................................................... 284
7.3 Approaching and departing a contour............................................................................................ 288
Starting point and end point................................................................................................................ 288
Overview: Types of paths for contour approach and departure...........................................................290
Important positions for approach and departure................................................................................. 291
Approaching on a straight line with tangential connection: APPR LT.................................................. 293
Approaching on a straight line perpendicular to the first contour point: APPR LN.............................. 293
Approaching on a circular path with tangential connection: APPR CT.................................................294
Approaching on a circular path with tangential connection from a straight line to the contour:
APPR LCT............................................................................................................................................. 295
Departing in a straight line with tangential connection: DEP LT......................................................... 296
Departing in a straight line perpendicular to the last contour point: DEP LN...................................... 296
Departing on a circular path with tangential connection: DEP CT.......................................................297
Departing on a circular arc tangentially connecting the contour and a straight line: DEP LCT............. 297
7.4
Path contours

Cartesian coordinates.......................................................................................... 298
Overview of path functions................................................................................................................. 298
Straight line L.......................................................................................................................................299
Inserting a chamfer between two straight lines..................................................................................300
Rounded corners RND......................................................................................................................... 301
Circle center CC...................................................................................................................................302
Circular path C around circle center CC.............................................................................................. 303
Circle CR with defined radius.............................................................................................................. 304
Circle CT with tangential connection...................................................................................................306
Example: Linear movements and chamfers with Cartesian coordinates............................................. 307
Example: Circular movements with Cartesian coordinates................................................................. 308
Example: Full circle with Cartesian coordinates.................................................................................. 309
7.5 Path contours – Polar coordinates................................................................................................... 310
Overview.............................................................................................................................................. 310
Datum for polar coordinates: pole CC................................................................................................. 311
Straight line LP.....................................................................................................................................311
Circular path CP around pole CC......................................................................................................... 312
Circle CTP with tangential connection.................................................................................................312
Helix......................................................................................................................................................313