100 Chadwick-Helmuth Company, Inc.
Chapter 5 - General Operation
NOTE: Disregard the clock numbering on the chart when plotting
using the protractor. Use only the angles from the protractor.
If possible, make only a single change on the rotor for the first run, then
check the correctness of the chart. The move line (a line drawn between
the first and second or any sequential runs) that results from a single
change must be parallel to the fine lines that extend from the unchanged
axis. Since the 3.5 g added to the pitch link results in a lower IPS reading
than the first run, use this solution for the first adjustment.
In the example, the next run (No. 2) reading is 11:50 (from the balancer
and protractor), but it missed it’s intended position by one hour CCW.
Rotate the corrector body on the chart one hour clockwise to correct for
the one hour it missed it’s intended point. The “real” #2 point is replotted
at 11:50. Plot remaining corrections using the protractor with the
photocell line at approximately. 12:00 o’clock.
5.5.3.1 Counter-Clockwise Rotor Correction
Correct the chart for counter-clockwise-turning rotors (blue or CCW side
of the Rotor Protractor), using the following conditions:
• If the move line misses to the right of the expected point (as viewed
from first point to expected point), rotate the Rotor Protractor
counter-clockwise the same number of degrees by which the point
missed its intended angle.
• If the move line misses to the left of the expected point (as viewed
from first point to expected point), rotate the Rotor Protractor
clockwise on the graph the same number of degrees by which the
point missed its intended angle.
• If the move line is longer than the distance to the zero line, decrease
the adjustment proportionally.
• If the move line is shorter than the distance to the zero line, increase
the adjustment proportionally.
For an illustration, see the diagram on page 101.
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