HEIDENHAIN TNC 407 (280 580) User Manual User Manual
Page 151
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TNC 425/TNC 415 B/TNC 407
5–52
5
Programming Tool Movements
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A circle center that was previously entered or calculated is then no longer
valid.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 ?