Chains

Question 1

Heavy duty chain is recommended for

Answer 1

Heavy shock loading and reversing drives

Question 2

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

Answer 2

Resistance fatigue

Question 3

Multiple strand chain is used in heavy loads and _______ applications

Answer 3

High speed

Question 4

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

Answer 4

1.7 times

Question 5

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

Answer 5

Oil field chain is engineered for severe conditions.

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

Question 6

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

Answer 6

15 to 20

Question 7

Where is a rollerless chain used?

Answer 7

Maintain tension where motion is infrequent or very slow.

Lift chain on counterweights
Furnace doors

Question 8

Silent chain (timing chain) offers the ?

Answer 8

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

Question 9

A hunting link is used in silent chain when ?

Answer 9

An odd number of pitches is needed

Question 10

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

Answer 10

Vertical

Question 11

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

Answer 11

30

Question 12

Do press fit con links reduce chain load strength?

Answer 12

No

Question 13

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

Answer 13

Closed end of the spring clip facing the direction of travel

Question 14

To much tension causes :

Answer 14

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

Question 15

To little chain tension causes?

Answer 15

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

Question 16

Chain sag percent for low to medium speed drives?

Answer 16

4 to 6 percent

Question 17

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

Answer 17

2 - 3 %

Question 18

Chain slack for vertical drives?

Answer 18

2-3%

Question 19

Before approaching a running chain you must:

Answer 19

• ## remove any loose apparel or jewelry

Question 20

What is the correct way to carry a chain?

Answer 20

Question 21

What is the best way to control a chains wear?

Answer 21

Lubrication

Question 22

Tips for proper lubrication and lubricating chains?

Answer 22

• 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

Question 23

Chain lubrication for chains operating 1500 feet per minute?

Answer 23

Oil bath lubrication

Question 24

Lubrication method for low speed drives under 600 feet per minute

Answer 24

Manual or drip feed lubrication

Question 25

Forced lubrication is used on which drives?

Answer 25

Heavily loaded drives operating above the speed limits of bath lubrications

Question 26

The aim of inspecting and troubleshooting chain drives is?

Answer 26

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

Question 27

Inspection of chain drives should include the following:

Answer 27

- inspect guard - make sure guard fits entire drive - make sure backstop is installed properly to prevent roll back

Question 28

Lubrication checks

Answer 28

- 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.

Question 29

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

Answer 29

3

Question 30

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

Answer 30

Change chain

Question 31

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

Answer 31

- roughness or binding when the chain engages - teeth thinned down - teeth hooked at the tips

Question 32

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

Answer 32

Misalignment

Question 33

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

Answer 33

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

Question 34

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

Answer 34

- sprockets that are to small - imperfect form on the sprocket teeth - badly worn or oversized gullet on the sprocket teeth

Question 35

Chain designation chart

Answer 35

Question 36

When ordering sprockets you must specify the :

Answer 36

- chain pitch - chain type - number of strands - hub style

Question 37

Large sprocket ratios will create a ______ wrap angle?

Answer 37

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

Question 38

What is the ideal wrap angle?

Answer 38

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

Question 39

Recommend drive arrangements. See picture

Answer 39

Question 40

Idlers sprockets tension chains but also:

Answer 40

- 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

Question 41

When would you want hardened tooth sprockets?

Answer 41

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

Question 42

Type A hub

Answer 42

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

Question 43

B type sprocket hubs?

Answer 43

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

Question 44

Type C sprocket hub?

Answer 44

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

Question 45

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

Answer 45

1/4 to 1/8 gap

Question 46

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

Answer 46

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

Question 47

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.

Answer 47

Knock against sprocket with a soft faces hammer