
6.INTERPOLATION FUNCTION B-63943EN-1/02
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6.6 HELICAL INTERPOLATION
Overview
Helical interpolation which moved helically is enabled by specifying
up to two other axes which move synchronously with the circular
interpolation by circular commands.
A tangential velocity of an arc in a specified plane or a tangential
velocity about the linear axis can be specified as the feedrate,
depending on the setting of bit 5 (HTG) of parameter No.1403.
An F command specifies a feed rate along a circular arc, when HTG is
specified to 0. Therefore, the feed rate of the linear axis is as follows:
Length of linear axis
F ×
Length of circular arc
Determine the feed rate so the linear axis feed rate does not exceed
any of the various limit values.
The feedrate along the circumference of two circula
interpolated axes is the specified feedrate.
Z
X
Y
Tool path
If HTG is set to 1, specify a feedrate along the tool path about the
linear axis. Therefore, the tangential velocity of the arc is expressed
as follows:
Length of arc
F ×
(Length of arc)
2
+ (Length of linear axis)
2
The velocity along the linear axis is expressed as follows:
Length of linear axis
F ×
(Length of arc)
2
+ (Length of linear axis)
2