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y 201  

 

 

The terms of coordinated motion are best explained in terms of the vector motion.  The vector velocity, 
Vs, which is also known as the feed rate, is the vector sum of the velocities along the X and Y axes, Vx 
and Vy. 

 

=

+

2

2

 

The vector distance is the integral of Vs, or the total distance traveled along the path.  To illustrate this 
further, suppose that a string was placed along the path in the X-Y plane.  The length of that string 
represents the distance traveled by the vector motion. 

The vector velocity is specified independently of the path to allow continuous motion.  The path is 
specified as a collection of segments.  For the purpose of specifying the path, define a special X-Y 
coordinate system whose origin is the starting point of the sequence.  Each linear segment is specified 
by the X-Y coordinate of the final point expressed in units of resolution, and each circular arc is 
defined by the arc radius, the starting angle, and the angular width of the arc.  The zero angle 
corresponds to the positive direction of the X-axis and the CCW direction of rotation is positive.  
Angles are expressed in degrees, and the resolution is 1/256

th

 of a degree.  For example, the path 

shown in Fig. A-21 is specified by the instructions: 

 

VP 

 

          0,10000 

 

CR 

 

          10000, 180, -90 

 

VP 

 

          20000, 20000