
B-63790EN/01 4.DESCRIPTION OF PARAMETERS
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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.