Page 234 - Machinery Component Maintenance

216 Machinery Component Maintenance and Repair

Using the plotting board, we get corrections as shown in Figure 5-34
for vertical, and Figure 5-35 for horizontal corrections. The vertical cor-
rections are:
Outboard feet = Lower .034 in. by removing shims.
Inboard feet: Zero correction.

The horizontal corrections are plotted as:

Move inboard feet .0165 in. west.
Move outboard feet .061 in. west.

Reverse Indicator Method Using Crossover Brackets

At this point, we should be ready to look at a typical reverse-indicator
data sheet, (Figure 5-36) and the accompanying plotting board sketches
of Figure 5-37 (vertical moves) and Figure 5-38 (horizontal moves). This
was solved by using a step-by-step procedure in conjunction with the
standard alignment form for reverse-indicator alignment. These were the
steps:

1. Take data.
2. Check T + B vs. S + S.
3. Correct for sag.
4. Divide net vertical readings by 2.
5. Copy resulting figures into first and third lines of interpretation
without + or - signs.
6. Look at drawing, and decide whether higher or lower at S and
mark sheet.
7. Ditto at A.
8. Look at drawing, and decide which side to make zero for S. We
suggest zeroing the side opposite the “final” indicator position
shown in drawing. With the prepared form, this is already shown.
9. Add or subtract quantity required to get zero as desired. To keep
the equality, do the same to the “final” position.
10. Divide by 2.
1 1. Repeat steps 8, 9, and 10 for plane A.
12. Copy resulting figures from steps 10 and 11, without + or -
signs, into 7th and 9th lines of interpretation.
(Exr continued on page 220)