
B-63783EN-1/01 6.NTERPOLATION FUNCTION
- 603 -
- Conical
interpolation
+Z
+
+
Fig. 6.17 (b) Conical interpolation
Parameter
2440 Minimum radius to which a specified feedrate is kept in spiral interpolation
or conical interpolation
[Input type] Parameter input
[Data type] Real
[Unit of data] mm, inch (input unit)
[Minimum unit of data] Depend on the increment system of the reference axis
[Valid data range] (In case of IS-B, from 1.0 through 999999.999 for mm input and from 1.0
through 99999.9999 for inch input)
If this parameter is set to 0 or out of range, it is assumed that the minimum value in
the data range is specified. In spiral interpolation and conical interpolation, the
feedrate is usually kept constant. When the radius of a spiral becomes small near
the center of the spiral, however, the corresponding angular velocity may become
very high. To prevent this from occurring, the system keeps the angular velocity
constant when the radius of a spiral reaches the value specified in this parameter,
resulting in a lower velocity than before.