Belts Flashcards

0
Q

what part of the V-belt carries the load

A

Tensile members

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1
Q

What is the V belt minimum arc of contact

A

120°

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2
Q

How does a V-belt transmit power

A

Friction between the sides of the belt and the sides of the sheave groove

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3
Q

The belt terminology “stretch” means what

A

Increase in length of the belt over the period of time that it is in service

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4
Q

The belt terminology “creep” means what

A

Loss of driving speed due to the lengthening and shortening of the belt as it cycles from the slack side to the tight side

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5
Q

What kind of problems would “slip” give you

A

Power loss between the driver and driven
belt and sheave groove wear
extra heat which degrades the belt material

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6
Q

It depends on the nature of the surfaces in contact

A

Coefficient of friction

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7
Q

Arc of contact is the number of “what” that about wraps around the Pulley

A

Degrees

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8
Q

What does tension on the belt determine

A

The force between the belt and the pulley

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9
Q

Classical series belts are recognized by what designation on the label

A

A, B, C, D and sometimes E

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10
Q

What are the four variations of the standard classical series belts

A

Cogged raw edge
banded
double V
and fractional horsepower

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11
Q

cogged raw edge are designated as….

A

AX, BX and CX

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12
Q

Double V belts are designated how….

A

AA, BB and CC

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13
Q

Fractional horsepower belts are designated how and are used for what kind of duty

A

2L,3L,4L,5L

Light duty

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14
Q

High-capacity belts are designated how

A

3V, 5V and 8V

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15
Q

On a high-capacity belt how is the designation measured in inches

A

3/8 inch
Ex 3V= 3/8”
Ex 8V= 1”

16
Q

Poly V belts are also called V rib belts what are their designations

A

J, K, L and M

17
Q

On poly V belts what is the designation H used for

A

Small sheaves and miniature drives

18
Q

What kind of belt is used when the sheave is designed to open and close with speed changes

A

Variable speed belts

19
Q

Variable speed belt what is the width measured in inches

A

Sixteenths of an inch

20
Q

On an open-ended belt what is it’s main advantage

A

They can be cut to any length and then be molded together

21
Q

What is a main limitation of an open-ended belt

A

You can only carry one third of the load

22
Q

Link Belts are only used for what

A

Emergencies

23
Q

Round belts have a great advantage and are suitable for what kind of drives
Name two

A

Quarter turn and serpentine Drive’s

24
If you have a belt that was cut at the bottom and sidewall what would be the cause of this kind of damage
Pryed over the sheave and damaged during installation
25
What is the maximum misalignment you must not exceed "in inches" per foot of distance
A 16th of an inch per foot of distance
26
What Kind of tool should you used for belt tensioning
Belt deflection gauge
27
What are three things that idler pulleys do on belt driven systems
They increase belt tension increase the arc of contact and prevent belt whip
28
What is the difference between inside and outside idler pulley
An inside idler pulley decreases the arc of contact | Outside idler pulley provides tensioning for the belt
29
Synchronous belts cannot tolerate any what
Slippage
30
Synchronous belts are used for what kind of operations
Smooth high-speed very small radius drives And short center to center distances
31
What is the minimum arc of contact and how many teeth should be on the sprocket of a synchronous belt
60° and a minimum of six teeth
32
Round and trapezoidal teeth are for what kind of belt
Synchronous belts
33
What is the length and width of this synchronous belt | 255L025
25.5" long | .25" wide
34
What is the difference between a pulley and a sheave
A pulley will transmit its power from its rim to the belt | A sheave is a pulley with a groove that runs around the circumference of the rim
35
A Sprocket has what running across the rim
Grooves
36
What is the number of grooves and width of the sprocket code 24L050
24 grooves | 1/2" wide
37
3 type of hubs
Web Block Arm