Alignment Flashcards by Crystal Vidnes

Vam
Vom
Ham
Hom

Vertical angular misalignment
Vertical offset misalignment
Horizontal angular misalignment
Horizontal offset misalignment

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List 4 types of shaft joining and coupling devices used in most power transmission systems

Ridges
Flexible
Universal
Fluid

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The three examples of misalignment

Parallel (offset)
Angular
End float (axial)
All combined combination

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Shaft joining and coupling devices are used on power transmission systems when the speed of the driven shaft must be ? The speed of the driving shaft

Equal to

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Which type of universal joint will compensate for angular,parallel, or combination misalignment

Double

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A basic fluid coupling is made up of what two parts

Impeller and runner

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Using the formula calculate the thickness of the shims needed under the closest feet of this example to correct the angular misalignment

A=20in.
B=50in.
C=10in.
D=0.020in.

Side 1 = DA\C =.040
Side 2 =DB\C=.100

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If you lay out a straight edge across the two hubs of a coupling and a gap exists between one of the hubs and the straight edge,what type of misalignment is indicated

Parallel

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What is the first step to aligning the driving and the driven shaft

Bolt down the driven equipment securely to its base

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The coupling gap is the distance between the

Face of the driving and the driven hub

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Couplings which have metal to metal contact

Require constant lubrication

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When using the dial indicator method to align a fluid coupler the stem of the dial indicator must ride against what type of surface

Finished

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The chamfer placed on the end of a splined input shaft serves what purpose

It makes insertion into the coupling easier

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Overheating of the fluid coupling can be coursed by

Too much or to little fluid

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To check for coupling slip you would use what instrument

Tachometer

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You have just installed a fluid coupling and are checking the amount of slip. The driving shaft is turning at 1500 RPM. at what speed should the driven shaft be turning to be within allowable range

1425-1455RPM

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In order for an alignment procedure to work both shafts must have

Fixed circular bearings supporting them

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How far above or below the centre of the pumps coupling flange does the center line of the motor shaft ( extended) meet the flange(-.002+.004=0.002)

.001in.

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How far towards the near side or the far side of the centre of the pump’s coupling flange does the centreline of the motor shaft ( extended) meet the flange?(.004\2=)

.002

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How much horizontal misalignment is there between the pump shaft and the motor shaft (-.001)

.001

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An advantage of a laser alignment equipment over dial indicators is that laser equipment is

More accurate

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Soft foot is a condition in which one foot of a machine is ? than the other

Higher

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After you zero a dial indicator on the top of a shaft you must correct the reading at bottom of the shaft for?

Set up sag / or bar sag

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Thermal growth will occur if the equipment will operate at a different? than when it was aligned

Temperature

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Before you start aligning equipment you must? the power

Lock out tag out

What is the reason for rotating both shafts when taking measurements with dial indicators

Avoid errors causing shaft runout

What is the purpose of repeating the measurements from dial indicators several times

Consistent measurements confirm accuracy

In graphing a misalignment the horizontal direction on your graph paper represents the ? arrangement of the equipment. The vertical direction represents the? arrangement

Axial Radial

How is the amount of vertical or horizontal shaft misalignment related to the total indicator reading from a dial indicator

Misalignment half the TIR

In alignment more than two machines you might need to establish a new? and align all the machines with it

Reference line

In a face rim alignment procedure you need to measure the setup sag for which indicator

Rim indicator only

Why should the face indicator be mounted when you measure the setup sag for the rim indicator

It’s weight contributed to the sag

In the graphical layout for the face to rim alignment the angular misalignment of the movable machine is determined from measurements taken by the ? indicator

Face

In performing a reverse indicator alignment on machines separated by long floating shaft what structure do the dia indicators contact

Floating shaft

When laying out a long span alignment on graph paper you must locate the coupling centre at the movable machine and the dial indicator near this coupling on the line representing the floating shaft how do you locate these points accurately

Use a compass

What are the main advantages of using laser alignment equipment instead of dial indicators

Faster More accurate Easier

What are the three key parts of laser alignment equipment

Laser diode Detector Reflecting prism Computer

The most common type of misalignment is

Combination

Misalignment can cause

Equipment damage Vibration Loss of production

Misalignment reduces the load on bearings

False it increases loads on bearings

When machines are aligned properly they produce no vibration

False many other possible causes of vibration

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

Soft foot

Runout refers to

Eccentricity

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

False mast always be checked

How does end float affect a rim and face alignment

Causes face reading to be unreliable and it must be controlled ( shaft always out)

Use elastomer( Teflon )shims to

Correct angular soft foot

Dial bar sag affects face readings in rim and face alignment

False it affects rim readings

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

True

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

False must be left loose when alignment is completed

In rim and face formula what does D represent

The diameter of the circle the face dial makes

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

Move right 12 mils

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

The coupling gap is smaller at the bottom

How many shims should be placed under each foot

Four or fewer

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 correct vertical TIR rim

4 mils

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

Only the sign of the reading will change

Rim dial indicator readings are taken off a coupling

90 o to shaft axis

What does the acronym MTBS stand for

Machine to be shimmed

The cross dial alignment procedure uses

Two dials reading off opposite rims

In what shaft position are cross dial sweep readings taken and recorded

In four planes at 12,3,6,and 9 o’clock

Which dial alignment procedure has concerns with shaft end float error

Rim and face

In cross dialling procedures when mounting the A and B dials onto a machine to be aligned make sure

B dial reads off the MTBS

Before starting to take a set of cross dialling sweeps readings it is suggested that

A is zeroed at the top and B at the bottom

Values to be plotted on graph for A and B dials in the vertical plane are read at which locations

A bottom and B top

The best set of dial brackets would be

Free of sag by design

Why is it important to use the entire graph scale when constructing a cross dialling graphical solution

The constructed graph is more accurate

The centreline of the graph represents

The fixed centreline

One advantage of using the cross dialling procedure is that the readings will not be incorrect because of error from

End float

Rim runout readings are taken with the dial button reading on

The rotated rim

When checking for coupling rim runout the high spot on the rim causes the dial to

Move to a positive value

Why would you lockout a machine before performing an alignment

To protect yourself and others from unwanted machine start or rollover while performing an alignment

Name four key laser components

Laser transmitters(transducer) Reflector Control unit Detector/mounting bracket

On a single reflected beam laser unit would you mount the laser/ detector on the shaft of the fixed of the movable machine

On the stationary machine

Which part of the laser performs misalignment calculation

Microprocessor control unit

How do you ensure consistent and correct readings at the clock location

Use an inclinometer attached to the bracket or microprocessor inclinometer

Can you check alignment tolerance with a laser alignment system if so how

Yes Command the microprocessor control unit to check tolerance if the system has a bolt in dynamic tolerance function

Why should you shield laser alignment systems from heat sources

Change in temperature of the air or steam can cause the laser beam to wonder. Extreme heat can cause distortion of the laser head and brackets

Name one concern with cables when you repeatedly use laser alignment systems

Communication cables consist of multiple single core fine cable. High usage with continuous bending can cause metal fatigue and break,which can lead to inaccurate or no readings

How do you confirm the detector’s accuracy

Send unit to manufacturer or agent who will use a calibration tool to perform a calibration check

List 3 advantages of using a laser bore alignment system over piano wire

Saves time in set up and procedure No sag on laser Calculations are provided by the microprocessor Live moves can be carried out Print outs of alignment and moves are provided