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Millwright Block 2 (harmonized) NS > Chains > Flashcards

Chains Flashcards

1
Q

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

A

Spring clip
Cotter pin
Spring pin

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2
Q

What is an offset link?

A

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

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3
Q

What are the 4 types of sprockets

A

Type A, B, C, D

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4
Q

What is a type A sprocket

A

Plain bore

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5
Q

What is a type B sprocket

A

Hub on 1 side

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6
Q

What is a type B sockets advantage?

A

Can be placed closer to machinery

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7
Q

What is a type C sprocket?

A

Hub on both sides

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8
Q

What is a type D sprocket?

A

Detachable or specialty hub

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9
Q

What is the max chain speed?

A

1200fpm

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10
Q

What is a chains pin diameter?

A

5/16 of the pitch of chain

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11
Q

What is the chains width?

A

5/8 the chains pitch

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12
Q

What is the link plate thickness on regular chain?

A

1/8th of the chain pitch

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13
Q

What is the roller diameter of the chain?

A

5/8ths the pitch

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14
Q

What are the 3 types of chains

A

Regular
Light
Roller-less

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15
Q

What are the variations for the 3 types of chain?

A

0
1
5

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16
Q

What type of chain is 40

A

Regular

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17
Q

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

A

First number is 1/8ths

40 = 4/8 = 1/2

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18
Q

How is the circumference of a sprocket found?

A

Number of teeth x chain pitch

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19
Q

How is the diameter of a sprocket found?

A

Circumference divided by pie (3.14)

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20
Q

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

A

The first letter
D = double

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21
Q

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

A

Last two digits
15= 15 teeth

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22
Q

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

A

First two numbers
40

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23
Q

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

A

The second letter
B

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24
Q

What are the 4 types of sprocket strands?

A

S, D, T, Q

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25
Q

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

A

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

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26
Q

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

A

120 degrees

27
Q

What is the maximum ratio for chain sprockets?

28
Q

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

A

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

29
Q

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

A

The bottom

30
Q

What are the basic types of chain links?

A

Roller link
Pin link

31
Q

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

32
Q

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

A

5x the life but 10% less load

33
Q

How are O ring chain load capacity different?

A

5% less load from standard

34
Q

How are rollerless chains designated?

A

With the use of a the number 5

35
Q

What is a joining link?

A

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

36
Q

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

A

Used to change the chain length by 2 pitches

37
Q

What are the 3 silent chain designs?

A

Side guides
Centre guides
Serpentine drive

38
Q

What direction should a master link be installed?

A

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

39
Q

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

A

Reduces by 30%

40
Q

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

A

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

41
Q

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

A

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

42
Q

What should the chain sag be on vertical drives?

A

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

43
Q

When should you recheck a newly installed chain?

A

8 hours after running

44
Q

What are the three methods of chain lubrication?

A

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

45
Q

Where should you apply lubricant on chain?

A

Inside of chain

46
Q

What are the 3 materials for making sprockets?

A

Alloy cast iron
Medium carbon steel
Plastic

47
Q

What speeds are drip feed lubrication typically used for chains?

A

Low speed drives
600ftpm and less

48
Q

What speeds are bath lubrication typically used for chains?

A

Approximately 1500ftpm

49
Q

What speeds are forced lubrication methods typically used for chains?

A

Heavily loaded drives
Above 1500ftpm

50
Q

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

A

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

51
Q

What is a roll case?

A

Multiple lines of rollers attached by chains or belts with sprockets

52
Q

What are idler sprockets used for? (3)

A

Prevent chain whip
Improve chain wrap
Tension chains

53
Q

Why should you avoid using automatic take up idlers?

A

Chains need slack
Automated ones reduce chain life with excess wear

54
Q

If you change a sprocket what else must you do?

A

Change the chain

55
Q

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

A

Hardly anything. Heavy duty chain just has thicker side plates

56
Q

What is the pitch of #50 chain?

57
Q

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

A

One pitch at a time

58
Q

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

59
Q

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

A

Slightly less than 10”

60
Q

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

61
Q

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

62
Q

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

A

Pitch
Inside diameter
Roller diameter

63
Q

What tools are needed to measure chain deflection?

A

Ruler and straight edge

64
Q

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

A

First 100 hours then every 500 hours thereafter

Millwright Block 2 (harmonized) NS (17 decks)

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