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Red Seal Study Prep > Chains > Flashcards

Chains Flashcards

1
Q

Heavy duty chain is recommended for

A

Heavy shock loading and reversing drives

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2
Q

Heavy duty chain does not have higher load capacity but the thicker side plates increase its__________ thereby providing longer service life?

A

Resistance fatigue

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3
Q

Multiple strand chain is used in heavy loads and _______ applications

A

High speed

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4
Q

Double strand chain is approximately _______ time stronger the. Single strand

A

1.7 times

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5
Q

What is the difference between oil field chain and standard multiple strand chain?

A

Oil field chain is engineered for severe conditions.

Oilfield chain uses press for centre plates instead of slip fit. Making it stronger

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6
Q

Synthetic chain is up to ____ to ___ % lighter the. Steel chain

A

15 to 20

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7
Q

Where is a rollerless chain used?

A

Maintain tension where motion is infrequent or very slow.

Lift chain on counterweights
Furnace doors

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8
Q

Silent chain (timing chain) offers the ?

A

Highest efficiency
Widest range of speeds
Widest range of load capacities
Most compact design

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9
Q

A hunting link is used in silent chain when ?

A

An odd number of pitches is needed

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10
Q

Alignment in chain sprockets must be checked in both the horizontal and _______ planes.

A

Vertical

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11
Q

Slip fitted con link changes the chain length by 2 pitches. And reduces the working capacity of chain length by ______%

A

30

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12
Q

Do press fit con links reduce chain load strength?

A

No

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13
Q

Master links with spring clips must be installed in which direction?

A

Closed end of the spring clip facing the direction of travel

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14
Q

To much tension causes :

A
  • reduced chain and sprocket life
  • over loading of bearings
  • inadequate lubrication
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15
Q

To little chain tension causes?

A
  • chain whip and vibration which can destroy bearings
  • excessive chain sagging
  • chain wrap on sprockets
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16
Q

Chain sag percent for low to medium speed drives?

A

4 to 6 percent

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17
Q

Proper chain sag for high speed, reversing or impulse drives should be

A

2 - 3 %

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18
Q

Chain slack for vertical drives?

A

2-3%

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19
Q

Before approaching a running chain you must:

A
  • ## remove any loose apparel or jewelry
20
Q

What is the correct way to carry a chain?

A
21
Q

What is the best way to control a chains wear?

A

Lubrication

22
Q

Tips for proper lubrication and lubricating chains?

A
  • good grade petroleum oil without additives (block entry of oil to pin and bushing)
  • select oil with highest viscosity that still flows into the joint
  • grease on outside of chain only provides corrosion resistance
  • ensure lubricant is applied at the side plates
23
Q

Chain lubrication for chains operating 1500 feet per minute?

A

Oil bath lubrication

24
Q

Lubrication method for low speed drives under 600 feet per minute

A

Manual or drip feed lubrication

25
Q

Forced lubrication is used on which drives?

A

Heavily loaded drives operating above the speed limits of bath lubrications

26
Q

The aim of inspecting and troubleshooting chain drives is?

A

To make machines run as efficiently and as reliably as they did when they were new

27
Q

Inspection of chain drives should include the following:

A
  • inspect guard
  • make sure guard fits entire drive
  • make sure backstop is installed properly to prevent roll back
28
Q

Lubrication checks

A
  • low speed drive make sure lubrication schedule is followed
  • remove dirt from chain and relubricate
  • check drip lubricators for adequate flow
  • check oil level for bath lubrication
  • check for contamination in oil change if needed
  • on forced lubrication check each orifice is clear and directing oil to each link
  • check the chain tension and adjust as needed
  • check for evidence of inadequate lubrication.
29
Q

If chain is elongated by more the. ___% it needs to be replaced.

A

3

30
Q

If rollers ride up on the tips of the sprocket what should you do?

A

Change chain

31
Q

When checking sprockets for wear replace if any of these signs are present:

A
  • roughness or binding when the chain engages
  • teeth thinned down
  • teeth hooked at the tips
32
Q

If sprockets are showing west on the sides it is an indication of?

A

Misalignment

33
Q

Why do you not install a new chain on a worn sprocket and vice versa?

A

Worn chain will wreck a new sprocket
Worn sprocket will wreck new chain

34
Q

Bushing failure can be caused by overload however other causes are unique to bushing failure such as:

A
  • sprockets that are to small
  • imperfect form on the sprocket teeth
  • badly worn or oversized gullet on the sprocket teeth
35
Q

Chain designation chart

A
36
Q

When ordering sprockets you must specify the :

A
  • chain pitch
  • chain type
  • number of strands
  • hub style
37
Q

Large sprocket ratios will create a ______ wrap angle?

A

Small.

The closer the sprockets are and the longer the drive is the larger the wrap angle.

38
Q

What is the ideal wrap angle?

A

120 degrees is ideal but as low as 90 degrees will still transmit the load.

39
Q

Recommend drive arrangements. See picture

A
40
Q

Idlers sprockets tension chains but also:

A
  • prevent chain whip
  • improve chain wrap on the smaller sprocket
  • guide the chain away from obstructions
  • provide reverse rotation of a sprocket outside the drive
41
Q

When would you want hardened tooth sprockets?

A
  • when number of teeth is 25 or less
  • heavily loaded drives
  • abrasive conditions
  • high speed drives
  • drives that require extremely long life
42
Q

Type A hub

A

Flat plate style sprocket. Can have a hub bolted or welded on

43
Q

B type sprocket hubs?

A

Hub on one side. Not as strong as both sides but still strong enough for the load.

44
Q

Type C sprocket hub?

A

Hub on both sides. Good for large sprockets to provide support.

45
Q

After a QD bushing has been installed there should be how much gap between the sprocket and the flange?

A

1/4 to 1/8 gap

46
Q

Split taper bushings have alignment keys offset from the centreline. When installing multiple sprockets it is very important to ?

A

Make sure the tapers are all facing the same direction or the teeth won’t line up to the other sprockets

47
Q

When installing a taper lock bushing you need to tighten the set screws progressively and evenly then _______ and retighten this step until screws remain tight.

A

Knock against sprocket with a soft faces hammer

Red Seal Study Prep (5 decks)

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