
B-63783EN-1/01 6.INTERPOLATION FUNCTION
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6.7 HELICAL INTERPOLATION B
General
With the speed command for helical interpolation B, parameter HTG (bit
2 of parameter No. 1401) can be used to specify either a feedrate
tangential to an arc or a tangential feedrate that includes movement along
the linear axis. If HTG is set to 0, a feedrate along an arc is specified by
an F command. Therefore, the feedrate on a linear axis is as follows:
arccircularofLength
axislinearofLength
F ×
Determine the feedrate so that the linear axis feedrate does not exceed
any of the limit values.
Fig.6.7 (a) Feedrate When Parameter HTG = 0
When bit 2 (HTG) of parameter No. 1401 is set to 1, the speed command
specifies the feedrate along the actual tool path, including movement
along the linear axis.
In this case, the feedrate along the arc on the plane is:
22
)()( axislinearofLengtharccircularofLength
arccircularofLength
F
+
×
The feedrate along the linear axis is:
22
)()( axislinearofLengtharccircularofLength
axislinearofLength
F
+
×
Z
Y
The feedrate along the circumference of two
circular interpolated axes is the specified feedrate.
Tool path