Chain drives

Question 1

Why is a chain drive considered a positive drive

Answer 1

because it does not rely on friction to maintain contact but sliding contact.

Question 2

What are the two main types of roller chain construction

Answer 2

.riveted-bradded pins hold it together, think bike chain

cottered-cotter keys are used, they look like the breast cancer ribbon

Question 3

What are the two terms used for the special link used to produce a strand of chain with an odd number of links

Answer 3

offset link

half link

Question 4

What is the horsepower relationship between multiple strand chain (2,3 or 4 strand chains) and single strand chain

Answer 4

each additional strand increases the HP capacity

2 1.7
3 2.5
4 3.3

Question 5

1.7

LIst and define the three measurements of a roller chain

Answer 5

?

Question 6

WHat are the advantages of inverted tooth (silent chain) drives

Answer 6

consists of a number of thin plates instead of the typical chain link.

chain conforms better to sprocket

Very quiet

minimize chordal actrion

Question 7

When should standard chains be replaced by heavy series chains

Answer 7

extreme conditions like super shock loading and other extreme conditions

greater resistance against fatigue failres

Question 8

Will heavy series chain run on the same sprockets as standard chain? Why or why not

Answer 8

yes they will

Question 9

WHat is the major disadvantage of self lubricating chains

Answer 9

LACK OF STRENGTH and CAPACITY

Question 10

What are some uses of chain attachments

Answer 10

conveyor belts

S1 is the side one that has them going vertically

B2 has 2 going along the base parallel with the base of the chain

Question 11

Describe “Chordal action in a chain drive

Answer 11

chains make contact below the t angent line of sprocket and is lefted above it and then push back down

Becasue of the fixed length

Question 12

Why is chordal action a problem in a chain drive

Answer 12

produces more noise and vibration limits power and speed

Question 13

What are the advantages of malleable iron cast over steel chain

Answer 13

malleable iron is more wear resistant and preforms better in hostile conditions

Pintle chain is the common type

Question 14

Name three types of drag conveyor chain

Answer 14

h-type

steel bar

combination type

Question 15

Why do type C sprockets have hubs on both sides

Answer 15

used with larger sprockets to increase contact area with shaft. More contact area increases rigidity and better distributes overhung load for large drives.

Question 16

Which popular compression bushing has no flange

Answer 16

TAPER lock Bushings

Question 17

What are the two main types of engineered class steel chain

Answer 17

STRAIGHT SIDE BAR

OFFSET SIDE BAR

Question 18

How do you check for defective or warped sprockets

Answer 18

indicator dial
or

use a ruler to measure distances

Question 19

Name four types of chain lubrication

Answer 19

manual

drip

bath or disk

oil stream

oil-mist

Question 20

Review pictures

Answer 20

NOW

Question 21

chain pitch

Answer 21

distance bewteen joints. Looking at the side its the distance from circle to the next on the same joint

Question 22

INside width

Answer 22

width between rollers

Question 23

outside width

Answer 23

width where roller is

Question 24

two types of cast chain

Answer 24

they are made by casting rather than forging

pintle chain-look arms holding a barrel between the hands

H type chain
look like arms holding a barrel bu the barrel is wider than the arms
handles more shock and abuse