160105b Rim & Face Shaft Alignment.

Question 1

The most common type of misalignment is:

a) Offest.
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) FalseIt increases the load on bearings.

Question 4

When machines are aligned properly, they produce no vibration.

a) True
b) False

Answer 4

b) FalseThere 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) Softfoot

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) FalseIt affects rim reading.

Question 11

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

a) true
b) false

Answer 11

b) false

Question 12

Soft foot can be checked with:

a) feeler gauges or a taper gauge.
b) a dial indicator mounted on a magnetic base.
c) a dial indicator mounted on the coupling rim.
d) all of the above.

Answer 12

d) all of the above.

Question 13

Before a precise alignment is started, the machines should be roughly lined up horizontally within how close of true position?

a) 10 mils (0.25 mm)
b) 20 mils (0.51 mm)
c) 50 mils (1.27 mm)
d) 100 mils (2.54 mm)

Answer 13

a) 10 mils (0.25 mm)

Question 14

The main disadvantage of rim and face alignment is:

a) both shafts must be rotated.
b) end float.
c) it is too accurate for most installations.
d) it is too slow.

Answer 14

b) end float.Rim and face is a relatively fast method of aligning machine shafts. It has a further advantage in that it can be used when both shafts cannot be rotated together. However, shaft end float can seriously affect the face reading, although it can be eliminated and very accurate alignment obtained.

Question 15

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 will be different.
b) only the magnitude of the reading will change.
c) both the sign and the magnitude of the reading will remain the same.
d) only the sign of the reading will change.

Answer 15

d) only the sign of the reading will change.

Question 16

When sweep readings are taken, the sum of the horizontal readings should equal the sum of the vertical readings.

a) true
b) false

Answer 16

a) true

Question 17

In order to facilitate accurate horizontal adjustments, use:

a) pry bars.
b) shims.
c) dial indicators mounted on magnetic bases.
d) all of the above.

Answer 17

c) dial indicators mounted on magnetic bases.

Question 18

Dial bar sag is added to all rim readings when dial indicators are used.

a) true
b) false

Answer 18

b) falseDial bar sag will only affect rim readings at 12 o’clock and 6 o’clock

Question 19

Vertical alignments must be completed before any attempt is made to move the machine horizontally.

a) true
b) false

Answer 19

b) false

Question 20

Diameter D refers to the outside diameter of the coupling when dial indicators are used to perform a rim and face alignment.

a) true
b) false

Answer 20

b) false

Question 21

Horizontal misalignment is corrected by adding or removing shims from under the mounting feet of a machine

a) true
b) false

Answer 21

b) false

Question 22

The most reliable method of ensuring that an alignment is satisfactory under operating conditions is to use:

a) vibration analysis equipment.
b) laser alignment equipment.
c) rim and face equipment.
d) cross dial equipment.

Answer 22

a) vibration analysis equipment.

Question 23

As speed increases, the accuracy to which the machine shafts are aligned:

a) decreases.
b) is unaffected.
c) increases.
d) is not important.

Answer 23

c) increases.

Question 24

When dial indicators are used to measure misalignment, dial bar sag is added onto the 6 o’clock rim recorded reading in all rim and face alignment calculations.

a) true
b) false

Answer 24

a) true

Question 25

The difference between top and bottom readings is known as the:

a) shim move.
b) horizontal move.
c) total indicated reading.
d) soft foot.

Answer 25

c) total indicated reading.

Question 26

Dial bar sag readings are never used in horizontal move calculations.

a) true
b) false

Answer 26

a) true

Question 27

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

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

Answer 27

a) the diameter of the circle the face dial makes

Question 28

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

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 28

c) the coupling gap is smaller at the bottom

Question 29

How many shims should be placed under each foot?

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

Answer 29

b) four or fewer

Question 30

If dials are zeroed at 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 left 24 mils
c) Move right 12 mils
d) Remove 24 mil shims

Answer 30

b) Move left 24 mils- away from the 0 + towards the 0