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Millwright Block 2 > Belts > Flashcards

Belts Flashcards

1
Q

What is an advantage of belt drives over chain

A

Damper vibration

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2
Q

How much crown would we expect on a 6 inch flat belt pulley?

A

1/8 inch per foot, 1/16

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3
Q

How are classic V belts length measured?

A

Inside

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4
Q

What does the creep mean in the belt terminology

A

Speed reduced due to belt length vibration as its cycles from the slack to the tight side

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5
Q

Which part of the belt carries a load from one pulley to the other

A

The tensile member

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6
Q

Why use raw edge V belt?

A

Less slip

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7
Q

When will double angle v-belt be used?

A

When sheaves are driven by the top and Bottom of the belt

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8
Q

Belt slippage has been taking place under load?

A

Glazing and cracked

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9
Q

How wide is A42 ?

A

A= 1/2

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10
Q

3L200 , how wide?

A

2 inch

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11
Q

650L4, what type of belt?

A

Ploy b

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12
Q

What is belt tension?

A

Amount of stretch applied to a belt

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13
Q

What is installed tension?

A

Tension on the belt when the drive is not running

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14
Q

What is effective tension?

A

Is the tension heeded on the belt to transmit power without slippage

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15
Q

Common belt materials?

A

Cotton, leather, rubber, nylon and synthetic materials

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16
Q

How long should A new belt run before being retention

A

12-24 hours

17
Q

How is slip caused?

A

By the surface characteristics of the belt and pulleys

18
Q

How to control slip?

A

Using smaller pulley ratios , aligning the pulleys correctly, ensuring adequate take up

19
Q

What way is best to reconnect a broken belt if it needs to be fix ASAP?

A

Mechanical splices

20
Q

Best way to repair a torn belt?

A

Hot vulcanized

21
Q

A,B,C,D,E are all examples of?

A

Classic belts

22
Q

2L,3L,4L,5L are all examples of?

A

Fractional horse power belts

23
Q

3V,5V, 8V are all examples of?

A

Narrow series belts

24
Q

What is the normal life capacity for belts?

A

5,000 to 7,000 hours

25
Q

What is the normal life capacity for sheaves?

A

25,000 hrs

26
Q

What is the minimum belt wrap (arc of contact ) for belts

A

120 degrees

27
Q

What information can I get out of A50?

A

Classic belt
A 1/2

28
Q

What information can I get out of B50?

A

Classic belt
B: 5/8

29
Q

What information can I get out of C50?

A

Classic belt
C = 7/8

30
Q

What information an I get outta D50?

A

Classic belt
D= l 1/4

31
Q

What does grip depend on?

A

Area of contact
Materials of belt and pulleys
Tension in the belt

32
Q

What does arc of contact depend on?

A

Pulley diameter
Centre-to-centre distance
Take-up devices used

33
Q

What is the main advantage of v-belts?

A

Simple wedging action of the belt against the sides of the sheave groove

Millwright Block 2 (13 decks)

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