Couplings

Question 1

What is a coupling and what are the two basic classes of industrial couplings

Answer 1

a coupling is a mechanical device used to connect two rotating shafts for the purpose of transmitting torque

RIGID
FLEXIBLE-allow for end float or end play

Question 2

What is end float or endplay

Answer 2

The inclination of shafts to move back and forth across their bearings

Question 3

List three common types of rigid couplings and provide a short explanation of each type

Answer 3

Sleeve coupling-
          finished bore
          tapered bushing
Ribbed coupling
flange coupling

Question 4

What is ribbed coupling

Answer 4

As coupling that is like a split sleeve. It is split by a parallel line and bolted together

Question 5

What is a flange coupling

Answer 5

The opposite of the ribbed coupling. It is split vertically with bolts going parallel to shaft

Question 6

Why must rigid couplings be perfectly aligned

Answer 6

Without perfect alignment there will be excessive bearing wear. Rigid couplings are joined as if they were welded

Question 7

Which type of coupling is designed for heavy duty applications and high torque and speeds

Answer 7

flange couplings

Question 8

What is the ultimate goal when selecting a coupling

Answer 8

long life and trouble free service

Question 9

List the two categories of industrial couplings by their flexible members construction

Answer 9

Metallic couplings

Elastomeric couplings

Question 10

Name the three most common type of metallic element couplings found in indusrty

Answer 10

CHAIN couplings-use a roller chain on the circumference to tighten. also come with silent tooth
GEAR couplings
GRID couplings- a continuous s shaped springs goes through grooves along the entire coupling

Question 11

why do most chain couplings require lubrication

Answer 11

Because of the metal to metal contact of the moving parts

the exception is nylon chain couplings

Question 12

Where are nylon chain coupling normally used

Answer 12

Light duty application

corrosive environments

industrializes where you do not want conataminants

Question 13

THe elastomeric coupling insert is loaded in compression or shear. What is the difference

Answer 13

The insert is what fills the space. could look like a star or the spiders from work

Compression-pinned, bolted or molded to coupling hub (spider)

shear-usually bolted or clamped to hubs, can withstand more misalignment and provide better shock absorbing abilities

Question 14

All elastomeric couplings work

Answer 14

better than other couplings in shock and vibration type industries

Question 15

Name the two types of elastomeric couplings that are loaded in shear

Answer 15

Rubber tire-two flanged clamp the rubber tire in place, allowing it two flex as needed

Donut

Question 16

What is the difference between a clearance and an interference fit when installing a coupling

Answer 16

Clarence fit- hub will slide onto shaft without forcing or heating

Interference fit-hub must be heated so it will expand

Question 17

Name the two types of elastomeric couplings that are loaded in compression

Answer 17

Jaw type

Rubber bushing

Question 18

What are the three basic methods for coupling alignment

Answer 18

Straightedge

Dial indicator

Laser

Question 19

Test have shown that precision alignment can increase bearing life and seal life on average

Answer 19

6 years

Question 20

What is runout

Answer 20

Amount of WOBBLE caused by loose machinery bearings or bent shaft or poorly machined parts

Question 21

What is soft foot

Answer 21

condition that exists when foot of a machine does not equally support its weight

Question 22

What are the two types of misalignment for

Answer 22

Angular misalignment

parallel misalignment

Question 23

What is the most accurate method of coupling alignment

Answer 23

laser alignment