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PMMI Mechanical Drives 1 & 2 > POWER TRANSMISSION AND SHAFTS > Flashcards

POWER TRANSMISSION AND SHAFTS Flashcards

1
Q

Describe the function of a shaft and give an application

A

Shafts transmit power to a location outside the machine.

Example: A drill Spindle consist of a shaft with a cutter attached.

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2
Q

List four (4) types of Shaft Materials

A

Cold Rolled Steel
Hardened Steel
Chrome Plated Steel
Stainless Steel

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3
Q

Describe the function of a bearing

A

The function of a bearing is to Support and guide a moving machine member with minimum amount of friction.

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4
Q

Define three (3) types of bearing loads

A

Radial
Thrust
Combination

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5
Q

For radial loads, use at least _______ bearings to secure the position of the shaft.

A

Two

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6
Q

What are the (2) Bearings Categories

A 
Plain Bearings ( Journal bearing)
Anti-Friction Bearings ( roller/ball Bearings )
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7
Q

Describe two (2) methods of mounting a shaft bearing

A

Pillow Block

Flange

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8
Q

A ______ Load acts in a direction that is perpendicular to the direction of force transmission.

A

Radial

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9
Q

A _____ Bearing is the type of bearing in which the surface of the other machine component slide over the bearing surface separated by a film of lubrication

A

Plain

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10
Q

Describe the function of a coupling

A

A coupling Connects one shaft to another.

EX: connecting electric motors and other prime movers to driven devices like pumps and gear reducers.

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11
Q

Name (4) categories of

mechanical couplings

A

Rigid Couplings
Flexible Couplings
Universal Joints
Clutches

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12
Q

Describe the operation of flexible jaw coupling

A

Flexible coupling connect 2 shafts and allow misalignment

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13
Q

What coupling allows zero misalignment

A

Rigid Coupling

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14
Q

______ Couplings are designed to connect (2) shafts that are not coaxially aligned

A

Universal Joint

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15
Q

Name (2) types of shaft misalignment

A

Angular misalignment

Parallel Misalignment

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16
Q

Standard round stock is often not precise enough so designers select _________ stock for most shaft applications.

A

accuracy

17
Q

The diameter of the accuracy stock shaft is always ______ than the nominal diameter, due to its precision grinding.

A

Less

18
Q

An _________ load is often called a cantilever load.

A

overhang

19
Q

All electric motors have________ bearings, one on each side of the housing. These bearings support the motor’s rotor and shaft.

A

Two

20
Q

The two major categories of bearings used are ______ bearings and anti-friction bearings.

A

Plain

21
Q

________ bearings are designed to support either radial loads or axial (thrust) loads. The surface of the moving machine component slides over the bearing surface. Ex. the crankshaft of a car engine.

A

Plain

22
Q

___________ bearings rotate with the moving machine component by using rollers or balls that rotate within the bearing.

A

Anti-friction

23
Q

There are four general categories of mechanical couplings: rigid couplings, __________ couplings, universal joints, and clutches. They are used to connect one shaft to another.

A

Flexible

24
Q

_______ couplings couple two shafts together rigidly so that the shafts act as a single continuous assembly and does not allow any misalignment. Used in applications that need very long shaft lengths.

A

Rigid

25
Q

________ couplings connect two shafts together and allow for some misalignment. Used in applications that require two independently supported coaxial shafts to be coupled together.

A

Flexible

26
Q

The ___________ joint allows two shafts that are not coaxially aligned to be connected. Ex. papermaking machine requires a motor to drive a roller that is offset from the motor shaft.

A

Universal

27
Q

________ are designed to allow two turning shafts to connect and disconnect from each other.

A

Clutches

28
Q

Excessive __________ is known to be a main cause of early failure of equipment.

A

Vibration

29
Q

Shaft alignment corrects angular and ________ misalignment which is measured on the horizontal and vertical planes.

A

Parallel

30
Q

To correct the _________ angular misalignment, add shims to the front or back of the motor.

A

Vertical

31
Q

Four methods of measuring misalignment in order from least accurate to most accurate: straight edge & ______ gauge method, face and rim method, reverse indicator method, and laser alignment.

A

Feeler

PMMI Mechanical Drives 1 & 2 (7 decks)

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