HEIDENHAIN TNC 320 User Manual page 246

6
Programming contours
Path contours  Cartesian coordinates
6.4
CircleCR with defined radius
The tool moves on a circular path with the radius R.
Coordinates of the arc end point
Radius R (the algebraic sign determines the size of
the arc)
Direction of rotation DR Note: The algebraic sign
determines whether the arc is concave or convex.
Miscellaneous function M
Feed F
Full circle
For a full circle, program two blocks in succession:
The end point of the first semicircle is the starting point of the
second. The end point of the second semicircle is the starting point
of the first.
Central angle CCA and arc radius R
The starting and end points on the contour can be connected with
four arcs of the same radius:
Smaller arc: CCA<180°
Enter the radius with a positive sign R>0
Larger arc: CCA>180°
Enter the radius with a negative sign R<0
The direction of rotation determines whether the arc is curving
outward (convex) or curving inward (concave):
Convex: Direction of rotation DR– (with radius compensation RL)
Concave: Direction of rotation DR+ (with radius compensation RL)
The distance from the starting and end points of the
arc diameter cannot be greater than the diameter of
the arc.
The maximum radius is 99.9999 m.
You can also enter rotary axes A, B and C.
The TNC normally makes circular movements in
the active working plane. If you program circular
arcs that do not lie in the active working plane, and
at the same time rotate this movement, then the
TNC moves the tool in a spatial arc, which means a
circular arc in 3 axes.
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HEIDENHAIN | TNC 320 | Conversational Programming User's Manual | 9/2016