Page 316 - Machinery Component Maintenance

298 Machinery Component Maintenance and Repair

Angle of Teat Maas 0' 30' 60" 90' 120' 150' 180' 210" 240' 270" 300' 330

Left Plane
Amount of (Lower Plane*)
Unbalance
Readings
Right Piane
(Upper Plane*)
c

Figure 6-31. Log for "Umar" test.

fl Achievable
11.2 x Claimed Mini-
I Raoidul Unbalance
10 x Claimed Minimum Achievable
#4
U Reoidual Unbalance
-0
ue
w-4
-40
e0
us( 8.8 x Claimed Minimum Achievable
a4
-40 Arithmetic Mean Rooidual Unbolance
9ue
v1-4 * c
Angle of Teot Ikoo
* Equal to ten times the indicator movement corresponding to the claimed minimum
achievable residual unbalance.

Figure 6-32. Diagram showing residual unbalance.

produce a sinusoidal averaging curve. In that case add 112 U,, re-
sidual unbalance to the appropriate test plane and repeat the test.
Draw a horizontal line representing the arithmetic mean of the scale
reading into each diagram and add two further lines representing
f 12 percent of the arithmetic mean for each curve, which accounts
for 1 Umr plus 20 percent for the effects of variation in the position
of the masses and scatter of the test data.