33
Required Bridge Elevation Change
'
(Bridge Dia.)(Out of Plumb)
Shaft Length
EAST
&
WEST
'
(180)(37)
434.5
.
15mils
NORTH
&
SOUTH
'
(180)(32)
434.5
.
13mils
15 Divisions
13 Divisions
N
S
E
W
N
S
E
W
Leg 1
Leg 1
Leg 2
Leg 2
Leg 3
Leg 3
Leg 4
Leg 4
Leg 5
Leg 5
Leg 6
Leg 6
Pivot Axis
Pivot Axis
Graphic Shim Calculation - 6 Legged Bridge
Given Data
Shaft Length =434.5"
Bridge Diameter = 180"
Out of Plumb of Center of Runout = 0.037 West, 0.032 South
Bridge Shim Calculation
(Thousands of an inch or mils)
Bridge Leg No.
EAST-WEST
NORTH-SOUTH
TOTAL
SHIM
ADDITIONS
1
15
6.5
21.5
16.75
2
11.25
12
23.25
19
3
3.75
12
15.75
11
4
0
6.5
6.5
1.75
5
3.75
1
4.75
0
6
11.25
1
12.25
7.5
Figure 19.--Graphic bridge shim calculation