Chains

Question 1

What are the 3 types of connecting links on a chain?

Answer 1

Spring clip
Cotter pin
Spring pin

Question 2

What is an offset link?

Answer 2

A non standard link to take up variations in chain that are unable to do so with standard connecting links

Question 3

What are the 4 types of sprockets

Answer 3

Type A, B, C, D

Question 4

What is a type A sprocket

Answer 4

Plain bore

Question 5

What is a type B sprocket

Answer 5

Hub on 1 side

Question 6

What is a type B sockets advantage?

Answer 6

Can be placed closer to machinery

Question 7

What is a type C sprocket?

Answer 7

Hub on both sides

Question 8

What is a type D sprocket?

Answer 8

Detachable or specialty hub

Question 9

What is the max chain speed?

Answer 9

1200fpm

Question 10

What is a chains pin diameter?

Answer 10

5/16 of the pitch of chain

Question 11

What is the chains width?

Answer 11

5/8 the chains pitch

Question 12

What is the link plate thickness on regular chain?

Answer 12

1/8th of the chain pitch

Question 13

What is the roller diameter of the chain?

Answer 13

5/8ths the pitch

Question 14

What are the 3 types of chains

Answer 14

Regular
Light
Roller-less

Question 15

What are the variations for the 3 types of chain?

Answer 15

0
1
5

Question 16

What type of chain is 40

Answer 16

Regular

Question 17

How is the size of chain determined in a number? Example 40 chain

Answer 17

First number is 1/8ths

40 = 4/8 = 1/2

Question 18

How is the circumference of a sprocket found?

Answer 18

Number of teeth x chain pitch

Question 19

How is the diameter of a sprocket found?

Answer 19

Circumference divided by pie (3.14)

Question 20

In hub numbers (D40B15) what shows the number of strands?

Answer 20

The first letter
D = double

Question 21

In hub numbers (D40B15) what shows the number of teeth?

Answer 21

Last two digits
15= 15 teeth

Question 22

In hub numbers (D40B15) what shows the chain/pitch?

Answer 22

First two numbers
40

Question 23

In hub numbers (D40B15) what shows the hub type?

Answer 23

The second letter
B

Question 24

What are the 4 types of sprocket strands?

Answer 24

S, D, T, Q

Question 25

What is the maximum distance the centre distance should be in terms of chains?

Answer 25

1.5 x the diameter of the largest sprocket OR NOT exceed 60x the chain pitch

Question 26

What is the arc of contact for the small sprocket on a chain drive system?

Answer 26

120 degrees

Question 27

What is the maximum ratio for chain sprockets?

Answer 27

3.5:1

Question 28

What’s the ideal chain slack for one direction single chain?

Answer 28

2-4% (2 for one way 4 for both)

Question 29

Where is the slack to be typically located on a chain drive

Answer 29

The bottom

Question 30

What are the basic types of chain links?

Answer 30

Roller link Pin link

Question 31

How much stronger is double strand chain to single strand chain?

Answer 31

1.7x

Question 32

Sintered bushing chains life is how much different than a roller bushing chain?

Answer 32

5x the life but 10% less load

Question 33

How are O ring chain load capacity different?

Answer 33

5% less load from standard

Question 34

How are rollerless chains designated?

Answer 34

With the use of a the number 5

Question 35

What is a joining link?

Answer 35

Used in silent chains when an odd number of pitches is required

Question 36

What is a joining link or connecting link in terms of silent chain?

Answer 36

Used to change the chain length by 2 pitches

Question 37

What are the 3 silent chain designs?

Answer 37

Side guides Centre guides Serpentine drive

Question 38

What direction should a master link be installed?

Answer 38

With the closed end of the spring clip in the direction of travel

Question 39

How does the slopped fitted plate affect the working capacity of chain?

Answer 39

Reduces by 30%

Question 40

What should the sag in the return strand for slow to medium speed drives?

Answer 40

Single deflection - 2-3% Double - 4-6%

Question 41

What should chain sac be for high speed reversing or impulse drives?

Answer 41

Double deflection - 2-3% Single- 1-1.5%

Question 42

What should the chain sag be on vertical drives?

Answer 42

Double deflection - 2-3% Single- 1-1.5%

Question 43

When should you recheck a newly installed chain?

Answer 43

8 hours after running

Question 44

What are the three methods of chain lubrication?

Answer 44

A. Manual / drip feed B. Bath C. Forced

Question 45

Where should you apply lubricant on chain?

Answer 45

Inside of chain

Question 46

What are the 3 materials for making sprockets?

Answer 46

Alloy cast iron Medium carbon steel Plastic

Question 47

What speeds are drip feed lubrication typically used for chains?

Answer 47

Low speed drives 600ftpm and less

Question 48

What speeds are bath lubrication typically used for chains?

Answer 48

Approximately 1500ftpm

Question 49

What speeds are forced lubrication methods typically used for chains?

Answer 49

Heavily loaded drives Above 1500ftpm

Question 50

What’s the difference between the configuration of double single strand sprockets and 2 strand sprockets

Answer 50

Double single strand - wide for 2 single strand chains 2 strand - narrow for 2 strand chain

Question 51

What is a roll case?

Answer 51

Multiple lines of rollers attached by chains or belts with sprockets

Question 52

What are idler sprockets used for? (3)

Answer 52

Prevent chain whip Improve chain wrap Tension chains

Question 53

Why should you avoid using automatic take up idlers?

Answer 53

Chains need slack Automated ones reduce chain life with excess wear

Question 54

If you change a sprocket what else must you do?

Answer 54

Change the chain

Question 55

What is the difference of load capacity between standard and heavy duty roller chain?

Answer 55

Hardly anything. Heavy duty chain just has thicker side plates

Question 56

What is the pitch of #50 chain?

Answer 56

5/8

Question 57

How much does an offset link permit shortening or lengthening of a chain?

Answer 57

One pitch at a time

Question 58

What would an acceptable chain deflection from a span for a centre to centre distance of 36” be?

Answer 58

.75”

Question 59

For silent chain sprocket pitch diameter of 10” what will the approximate diameter of the sprocket be?

Answer 59

Slightly less than 10”

Question 60

How many chain links needed for a #50 chain fitting a 20 tooth and 40 tooth sprocket of 48” centres?

Answer 60

184

Question 61

What is the proper amount of deflection UP AND DOWN of a newly installed medium speed drive chain?

Answer 61

4-6%

Question 62

The 3 important factors when measuring a chain for replacement are what?

Answer 62

Pitch Inside diameter Roller diameter

Question 63

What tools are needed to measure chain deflection?

Answer 63

Ruler and straight edge

Question 64

How often should you inspect roller chains newly placed into service?

Answer 64

First 100 hours then every 500 hours thereafter