Rim and face shaft alignment (160105b)

Question 1

The most common type of misalignment is :

a) offset
b) angular
c) combination
d) parallel

Answer 1

c) combination

Question 2

Misalignment can cause:

a) equipment damage
b) vibration
c) loss of production
d) all of the above

Answer 2

d) all of the above

Question 3

Misalignment reduces the load on bearings:

a) true
b) false

Answer 3

b) false; It increases load on bearings

Question 4

When machines are aligned properly, they produce no vibration

a) true
b) false

Answer 4

b) false; There are many other possible causes of vibration

Question 5

The correct term for the condition whereby a machine does not sit properly on all its mounting feet is:

a) wobble
b) warpage
c) soft foot
d) twisting

Answer 5

c) soft foot

Question 6

Runout refers to:

a) maximum shaft speed
b) misalignment
c) eccentricity
d) pipe strain
e) soft foot

Answer 6

c) eccentricity

Question 7

Dial bar sag is significant only when large diameter couplings and large spans are involved

a) true
b) false

Answer 7

b) false; It must always be checked

Question 8

How does end float affect a rim and face alignment?

Answer 8

End float causes face readings (angularity) to be unreliable. It must be controlled when taking readings.

Question 9

Use elastomer shims to:

a) compensate for thermal growth
b) correct parallel soft foot
c) compensate for pipe strain
d) correct angular soft foot

Answer 9

d) correct angular soft foot

Question 10

Dial bar sag affects face readings in rim and face alignment

a) true
b) false

Answer 10

b) false; It affects rim reading

Question 11

When you take sweep readings, the sum of the horizontal readings should equal the sum of the vertical readings (for each dial)

a) true
b) false

Answer 11

a) true

Question 12

After an alignment is completed, jacking bolts should be left tightened in order to prevent accidental movement of the machine

a) true
b) false

Answer 12

b) false; Jackbolts must be left loose when thealignment is complete

Question 13

In the rim and face formula, what does D represent?

a) the diameter of the circle the face dial makes
b) the distance from shaft center to face dial plunger
c) the diameter of the coupling hub
d) the diameter of the coupling flange

Answer 13

a) the diameter of the circle the face dial makes

Question 14

If dials were zeroed at the three o’clock and rotated to nine o’clock, what would need to be done if the face dial read zero and the rim dial read -24 mils?

a) Add 12 mil shims
b) Move 24 mils away from the datum line
c) Move 12 mils away from the datum line
d) Remove 24 mil shims

Answer 14

c) Move 12 mils away from the datum line

Question 15

When doing a vertical alignment, a positive face dial reading at the six o’clock position indicates:

a) the motor is too low
b) the coupling gap is larger at the bottom
c) the coupling gap is smaller at the bottom
d) the rear of the motor is too high

Answer 15

c) the coupling gap is smaller at the bottom

Question 16

What is the maximum number of shims that can be placed under each foot?

a) six or fewer
b) four or fewer
d) whatever is required

Answer 16

b) four or fewer

Question 17

During a rim and face alignment, you obtained rim readings of 0 mils at 12 o’clock and +2 mils at six o’clock. If the dial bar sag is 2 mils, what is the corrected vertical TIR rim?

a) 0 mils
b) 2 mils
c) 4 mils
d) none of the above

Answer 17

c) 4 mils

Question 18

If a dial indicator is set up to read on the outside (backside) of the coupling face instead of the inside:

a) both the sign and the magnitude of the reading are different
b) only the magnitude of the reading changes
c) both the sign and the magnitude of the reading remain the same
d) only the sign of the reading changes

Answer 18

d) only the sign of the reading changes

Question 19

The vertical TIRs for an alignment are 0 mils on the rim (zero bar sag) and +1 mil on the face. The specifications call for 0.0002 inch per inch angularity and 0.002 inch offset (maximum). The D is 5 inches and the L2 is 20. Which of the following would be the best choice for L2?

a) Remove 4 mils of shim
b) Add 4 mils of shim
c) Add 1 mil of shim
d) Do not adjust

Answer 19

d) Do not adjust