Chapter 5
319
Measurement Definition
Auto Alignment
1.
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. Cha
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. Chap
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Spindle Center Calculation
The calculation of the spindle center coordinates in the above steps 3 to 5 is based on the
following concept:
Figure 5-63
X-Y Coordinates of Spindle Center
As shown in the illustration above, determining the spindle center in terms of X-Y
coordinates requires three conditions to be satisfied (i.e, three known arbitrary points
where the circle passes through) in order to measure the alignment data.
1. Determine the P1 (X
1
,Y
1
) coordinates at Skew q
1
2. Determine the P2 (X
2
,Y
2
) coordinates at Skew q
2
3. Determine the P3 (X
3
,Y
3
) coordinates at Skew 0.
The X-Y coordinates of the spindle center can be computed mathematically relative to
points P1, P2 and P3. As an example, it is important that we determine points P1,P2 and P3
coordinates at the track center of radius R as accurately as possible, since the computation
in finding the coordinates of the spindle center is dependent on it. By connecting a line
between points P1-P3 and P2-P3 you can establish trigonometric equations between these
three points that will be used to determine the center of the spindle (X,Y).
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