
B–63523EN–1/03
6. INTERPOLATION FUNCTION
749
3471 Allowable difference between the specified end point and that calculated from
the increment (or decrement) and number of revolutions
for spiral or conical interpolation
[Data type] Two–word
Increment system IS–A IS–B IS–C Unit
Metric input 0.01 0.001 0.0001 mm
Inch input 0.001 0.0001 0.00001 inch
[Valid data range] 0 to 99999999
This parameter sets the maximum allowable value for the difference
(absolute value) between the specified end point and that calculated from
the increment (or decrement) and number of revolutions for spiral or
conical interpolation.
3472 Minimum radius with which the actual feedrate is
maintained for spiral or conical interpolation
[Data type] Two–word
Increment system IS–A IS–B IS–C Unit
Metric input 0.01 0.001 0.0001 mm
Inch input 0.001 0.0001 0.00001 inch
[Valid data range] 1000 to 99999999 (metric input)
10000 to 99999999 (inch input)
If this parameter is set to 0 or a value that falls outside the valid data range,
the minimum value in the valid data range is assumed.
Spiral and conical interpolation usually maintain a constant feedrate.
Near the center of the spiral, however, the radius is very small, such that
applying a constant feedrate would cause the angular velocity to become
very high. To prevent this, the angular velocity is regulated to a constant
value once the radius of the spiral has decreased to the value specified with
the parameter. As a result, the actual feedrate decreases.
Parameter
[Unit of data]
[Unit of data]