
6.INTERPOLATION FUNCTION B-63323EN-1/03
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6.6 HELICAL INTERPOLATION
General
Helical interpolation which moved helically is enabled by specifying up
to two other axes which move synchronously with the circular
interpolation by circular commands.
As the feedrate, either a feedrate tangent to an arc or a tangential feedrate
determined by also considering movement along the linear axes can be
specified. The feedrate to be specified can be selected by setting bit 2
(HTG) of parameter No. 1401. 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.6.6 (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
X
The feedrate along the circumference of two
circular interpolated axes is the specified feedrate.
Tool path