beautypg.com

HEIDENHAIN TNC 407 (280 580) User Manual User Manual

Page 151

background image

TNC 425/TNC 415 B/TNC 407

5–52

5

Programming Tool Movements

5.6

Contours – FK Free Contour Programming

Fig. 5.47:

Gradient angle and chord length of
an arc

LEN

AN

Free programming of circular arcs

Gradient angle of an arc

The gradient angle AN of an arc is defined by the entry tangent.

Chord length of an arc

The chord length LEN of an arc is the linear distance between its end
points.

Center of free-programmed circles

The TNC calculates a circle center for free-programmed arcs (FC and FCT
blocks). This makes is possible to program full circles in an FK program
block.

A circle center that was previously entered or calculated is then no longer
valid.

If, for example, you enter conventional polar coordinates that refer to a
pole from a CC block preceding an FC or FCT block, then you must enter
the pole again.

Input procedures and soft keys not described here have the same functions as for straight lines.

Direct input for an arc or arc end point

Known data

Dialog

Soft key

Rotational direction of the arc

ROTATION CLOCKWISE: DR-?

Radius of the arc

CIRCLE RADIUS?

Angle of leading axis to arc end point

ANGLE FOR ENDPOINT OF CIRCLE ?