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Chapter 9 Flatness Measurements
Setting Up for the Measurement
You are now ready to draw the internal measurement lines.
Drawing the internal measurement lines
To draw the internal measurement lines, follow these steps:
1
Draw diagonal lines to connect opposite corners of the grid (AE and GC in
Figure 9-3 or 9-4).
2
Mark stations on each of the diagonals, following these guidelines:
•
Mark stations outward from the intersection point of the two
diagonals.
•
Both halves of a diagonal must have the same number of stations.
•
If you cannot mark a whole number of stations on the diagonal, you
can either stop short of or continue past the end of the diagonal. The
software indicates the number of stations you should mark on the
diagonal.
•
You must have the same number of stations on each diagonal. If not,
all corners of the measurement grid may not be 90 degrees; recheck
your work.
3
Draw lines to connect the midpoints of opposite sides of the grid (lines 7
and 8 in Figure 9-3 or 9-4).
4
Mark stations on Lines 7 and 8.
The number of stations on Lines 7 and 8 must equal the number of
stations on the perimeter lines that parallel them.
If not, recheck your work.
You are now ready to assemble and mount the optics.
9-12
Measurements Reference Guide
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