160105b Rim & Face Shaft Alignment. Flashcards
The most common type of misalignment is:
a) Offest.
b) Angular.
c) Combination.
d) Parallel.
c) Combination.
Misalignment can cause:
a) Equipment Damage.
b) Vibration.
c) Loss of production.
d) All of the above.
d) All of the above.
Misalignment reduces the load on bearings.
a) True
b) False
b) FalseIt increases the load on bearings.
When machines are aligned properly, they produce no vibration.
a) True
b) False
b) FalseThere are many other possible causes of Vibration.
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
c) Softfoot
Runout refers to:
a) maximum shaft speed.
b) misalignment.
c) eccentricity.
d) pipe strain.
e) soft foot.
c) Eccentricity.
Dial bar sag is significant only when large diameter couplings and large spans are involved.
a) True
b) False
b) False.It must always be checked.
How does end float affect a rim and face alignment?
End float causes face readings (angularity) to be unreliable. It must be controlled when taking readings.
Use elastomer shims to:
a) Compensate for thermal growth
b) Correct parallel soft foot
c) Compensate for pipe strain
d) Correct angular soft foot
d) Correct angular soft foot.
Dial bar sag affects face readings in rim and face alignment.
a) True
b) False
b) FalseIt affects rim reading.
After an alignment is completed, jacking bolts should be left tightened to prevent accidental movement of the machine.
a) true
b) false
b) false
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.
d) all of the above.
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)
a) 10 mils (0.25 mm)
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.
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.
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.
d) only the sign of the reading will change.
When sweep readings are taken, the sum of the horizontal readings should equal the sum of the vertical readings.
a) true
b) false
a) true
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.
c) dial indicators mounted on magnetic bases.
Dial bar sag is added to all rim readings when dial indicators are used.
a) true
b) false
b) falseDial bar sag will only affect rim readings at 12 o’clock and 6 o’clock
Vertical alignments must be completed before any attempt is made to move the machine horizontally.
a) true
b) false
b) false
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
b) false
Horizontal misalignment is corrected by adding or removing shims from under the mounting feet of a machine
a) true
b) false
b) false
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.
a) vibration analysis equipment.
As speed increases, the accuracy to which the machine shafts are aligned:
a) decreases.
b) is unaffected.
c) increases.
d) is not important.
c) increases.
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
a) true
