Rim & Face Flashcards

1
Q

What is Shaft Alignment

A

Shaft alignment is the positioning of the rotational centers of two or more shafts in such a way that they are co-linear when the coupled pieces of equipment are under normal operating conditions

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2
Q

Collinearity

A

The practice of lining up the shafts of two machines that are or will be coupled to each other

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3
Q

Misalignment

A

When two shaft rotational centerlines are not collinear when the machines are in operation under normal operating conditions

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4
Q

Parallel or Offset misalignment

A

When shafts are still parallel and do not line up in either the horizontal or vertical plane

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5
Q

Angular misalignment

A

at least one of the shafts is out of place causing them to be at an angle to each other in either the horizontal or vertical plane

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6
Q

Combination misalignment

A

A combination of both offset (parallel) and angular misalignment. This is the most common form of misalignment.

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7
Q

Rigid coupling

A

a fixed union between two shafts, requires accurate alignment for smooth operation

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8
Q

Flexible coupling

A

allows for minor misalignment, the most common coupling

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9
Q

Special purpose couplings

A

completely unique, some require accurate alignment and others require a set amount of misalignment

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10
Q

Seals

A

verious types: Lip, labyrinth and mechanical. misalignment stresses components and leads to premature seal failure

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11
Q

Vibration

A

Misalignment causes vibration which leads to early failure of components, also nearby equipment

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12
Q

Downtime

A

Apart from cost of parts, there is the potential for a much greater cost in production downtime

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13
Q

Alignment accuracies

A

The better the alignment, the longer the equipment lasts between overhauls, also the better the alignment the faster a machine can rotate.

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14
Q

Work permit

A

Before doing any job, get a safe work permit, very important. Test for nearby hazards. Sets conditions for safe work such as ppe, barrier tape, signage, fire extinguisher and a watchperson

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15
Q

Lockout

A

Disabling the device you’re working on so it cannot operate during repair, also removing fluids and gases from piping and lube oil systems.

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16
Q

Hazard assessment

A

before doing the job look for potential hazards and provide controls. Know escape routes and fill out HA document. Put tools where they aren’t a tripping hazard. Familiarize with pinch points and sharp edges.

17
Q

Foundation

A

Inspect foundation on which the equipment base is mounted. Needs to be solid and have enough mass (2.5 times equipment weight) to prevent vibration being transmitted to or from machine.

18
Q

Base

A

Equipment mount to a base plate, must be level, solid and secured (Grout)

19
Q

Hardware

A

Inspect all hardware associated with the job. Clean tapped holes, replace washers that are dished. Dished washers can cause motor to move sideways when tightening.

20
Q

Pipe strain

A

Piping fastened to equipment stresses the housing due to improper alignment or not supported correctly.

21
Q

Soft foot

A

A situation where the weights distribution of a machine is not equal on all supports. Uneven base, bent feet, feet not being same length or loose material under feet. Angular or parallel.

22
Q

Parallel soft foot

A

Baseplate and foot are parallel

23
Q

Angular heel touching soft foot

A

the part of the foot closest to the machine is touching the baseplate

24
Q

Angular toe touching soft foot

A

the part of the foot furthest from the machine is touching the baseplate

25
Q

Soft foot adjustment

A

Readings over 0,002 inch on dial gauge. Feeler gauges on each corner of the foot is most accurate way of measuring soft foot

26
Q

Larger machine soft foot

A

May be possible to check by having a dial gauge reading directly on each foot.

27
Q

Runout

A

When a shaft of coupling is not rotating straight along its axis (eccentric shaft)

28
Q

Eccentric runout

A

When the shaft is moving straight but outward

29
Q

Angular runout

A

when the shaft is rotating at an angle

30
Q

End float

A

When a shaft moves lengthways during operation

31
Q

Dial bar sag

A

How gravity affects dial readings by bending the mounting bar, affects vertical rim readings only.