Mechanics Final

Question 1

What are 2 forms of lubrication?

Answer 1

Grease and oil

Question 2

Why do we use grease instead of oil?

Answer 2

It’s easily contained inside the housing

Question 3

What are 2 types of oil?

Answer 3

Synthetic and petroleum

Question 4

What type of lubricants are used for low speed and high temperature applications?

Answer 4

Dry lubricants

Question 5

Definition of linear bearings?

Answer 5

A group of bearings that provide low friction motion in one dimension

Question 6

Two ways mounted bearings lock to a shaft?

Answer 6

Set screw collar and eccentric

Question 7

2 types of belt construction?

Answer 7

Raw edge and envelope

Question 8

4 components of a belt?

Answer 8

1. Cushion rubber
2. Tensile cord
3. Insulation rubber
4. Backing fabric

Question 9

Why would it be beneficial to use envelope construction?

Answer 9

Protects the tensile cord in the belt from the elements

Question 10

2 ways to connect chains?

Answer 10

Master link and offset link

Question 11

Advantage of extended pitch?

Answer 11

Cheaper, lighter used for long center to center distances from shaft to shaft

Question 12

What are the 3 types of belts?

Answer 12

V-belts, toothed and flat

Question 13

What are the 3 types of v-belts?

Answer 13

Classic, Fractional HP, wedge

Question 14

Linear bearings consist of a fixed support component called what?

Answer 14

Rail, way or guide

Question 15

What are seals used for?

Answer 15

To keep the elements out and keep the lubrication inside.

Question 16

2 types of seals?

Answer 16

Contact and non contact

Question 17

What do contact seals do?

Answer 17

Keep contact with the rotating and stationary components

Question 18

What is an example of a non contact seal?

Answer 18

Labyrinth seal

Question 19

What do take up units do?

Answer 19

Adjust the center distance between shafts or where belt tightening is required

Question 20

What are the types of mounted bearings?

Answer 20

Pillow block (solid or split housing) flanged cartridges, cylindrical cartridges and take up units

Question 21

How are flanged cartridge bearings mounted?

Answer 21

On a vertical surface with shaft passing through a machine frame at a right angle

Question 22

Biggest advantages of drive chains?

Answer 22

Unlimited shelf life, durability, flexibility, positive engagement and variety

Question 23

Biggest disadvantages of chain drives?

Answer 23

Noisey and both sprockets need changed when chain is replaced.

Question 24

What keeps the connecting link pins from working loose?

Answer 24

Cotter pins and spring clips

Question 25

Advantages of wedge belts?

Answer 25

Provide more contact with the sheave and puts more support in the center of the belt

Question 26

Cam type & load following bearings consist of an inner and outer race with what kind of bearings between the races?

Answer 26

Plain or rolling element

Question 27

Spherical & rod end bearings have a ball that rotates within a race to accommodate what?

Answer 27

A wide range of angular misalignment

Question 28

What are the 3 different types of driver pulleys for v-belts, flat and toothed belts?

Answer 28

V-belts- sheave
Toothed- sprocket
Flat - drum style

Question 29

How much deflection should you have when adjusting belts?

Answer 29

¼” per foot of span

Question 30

Biggest advantage to belt drives?

Answer 30

Acts as a clutch to the system to prevent failure and they’re easily maintained