ADLINK Technology PCI-8254, User Manual

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Motion Control Theory 143
PCI-8254 / PCI-8258
4.8.2.3 Helical Interpolation
This controller supports 3-dimension helical interpolation (also
known as Spiral–Helix interpolation) as well as multiple input
methods to deal with demands of various applications. See below
for its setup:
Method 1: Given center of circle and angle (Center-Angle)
Method 2: Given center of circle and end point (Center-End)
Both methods are described below.
¾ Method 1: Given center of circle and angle (Center-Angle)
See table and figure below for helical curve parameters
• Example:
Figure 4-45: Three dimension spiral interpolation (method 1)
Parameters Description
Center point Center of circle (relative or absolute)
Angle
Starting point and ending point angle projected at the circle
plane of starting point (as shown in figure below). Plus and
minus sign indicate directions.
Normal vector Normal vector of starting point circle plane
Height Cone height (relative)
Final radius Radius of circle where the ending point is