Chain Drives
a chain vode of 60-4 indicates a ______ inch pitch chainthat is ______ strands wide.
.75, 4
Narrow chain is indicated by a _____ with in the pitch code.
1
The allowable mid-span moment of a virtical oriented chain drive is ____ to ____ percent.
2, 3
Dividing the mid-span movement by ____will give you the chain
2, sag
a silent chain drive system usually produces _____% less noise than a standared roller chain drive.
35
The allowable mid-span moment of a horizontally oriented chain drive is ____ to ____ percent.
4, 6
Rollerless chain is indicated by a ____ within the pitch code
5
What is the pitch of no. 60 roller chain?
6/8
Manually lubricated chains should be lubricated every ______ hours of operations.
8
A type_____ sprocket has no hum
A
Troubleshooting a chain drive sytem involves detemining the _______ cause of the fault and taking corrective action.
Actual
What is the attachment designation of a roller chain with 90 degree bent lugs on one side of the roller chain?
B1
What is the attachment designation of a roller chain with 90 degree bent lugs on both sides of the roller chain?
B2
A type ____ sprocket has a double hub
C
the oil flow of a type______ lubrication system should periodically be inspected o make sure that hte oil is flowing through the system properly
C
________action is caused by straight chain links moving about a circular sprocket.
Chordal
What is the main advantage of an inverted tooth drive?
Conforms well with the shape of the sprocket and noise reduction.
How do you check for defective or warped sprockets?
Dial indicator
Sprocket with less teeth will be ______than a sprocket with more teeth.
Faster
What are the advantages of malleable iron cast chain over steel chain?
Greater shock resistance and better for heavy duty.
Name the three types of drag conveyor chains.
H-Type, steel bar and combination
What is a type B sprocket?
Hub on one side
Name for types of chain lubricant systems?
Manual, drip, bath or disk, oil stream lubrications.
Describe chordal action in a chain drive.
Moves in straight lines around a circle.
What is the major disadvantage of a self lubricating chain?
Not very strong
What is the attachment designation of a roller chain with 180 degree bent lugs on one side of the roller chain?
S1
What is the attachment designation of a roller chain with 180 degree bent lugs on both sides of the roller chain?
S2
Silent chain is indicated by _______ wwhile high velocity, heavy-duty chani is indicated by _______.
SC, HV
Sprocket with more teeth will have_______ speed then a sprocket with less teeth
Slower
What are the two main types of engineered class steel chain?
Straight side bar and offset side bare.
Which popular compression bushing has no flange?
Taper lock
Why is a chain considered a positive drive?
There is no slip or creeping.
Why do type C (double Hub) sprockets have hubs on both sides?
To increase the contact area on the shaft
power is ______ from one shaft to another via a __________
Transferred. mechanical drive
This sprocket has no hub it is flat and requires another device to be mounted used for low speed and load
Type A (no hub)
_______________consistes of mannual and gravity drip lubication
Type A lubrication system
_________consists of the slinger disk and oil bath method.
Type B lubrication system
Why is chordal a problem in a chain drive?
Vibration caused by the rise and fall of the chain on the small sprocket. Detracts from chain performance and life limits power capacity and speed
When should standered chains be replaced by heavy -series chains?
When the standard chain is not durable enough for extreme conditions heavy shock loading .
Will heavy -series chain run on the same sprockets as standard chains?
Yes
the easiest drive system to install a chain on is one with _______ centers.
adjustable
The two methods commonly used to adjust chain centers are ______ centers and by using a _______.
adjustable center ,idler
Type D (detachablehub) sprockets have a _______ or ________
bolt on detachable, split hub
when replacing any component of a chain drive system, you should replace the sprocketsas well as the _______. This prevents you from mixing old components with new ones .
chain
A________ ________ is used to pull the loose ends of a chain together
chain puller
The taper design of a taper lock busing causes the bushing to _______ down onto the shaft.
clamp
Sprockets with a ________ hub is a type D hub
detachable
_______hubs are usually only found on larger sprockets.
double
A 20 in front of teh chain code indicates the chain is a _______-_______ chain
double pitch
the interlocking between chain and sprocket prevent the chain from _______when a load is applied to the sprocket.
flying of of the sprocket
Chain drives that are _______ lubricated should have their oil levels checked often enough to make sue that they never run dry
gravity drip
A silent chain must have a ________ to keep the chain from rotating off the sprockets
groove
The special link used to produce a strand of chain with an odd number of links is called a______ or a _______
half link/ offset link.
A special type of chain drive that has two or more strands of chain affixed side-by-side and is used on ______-duty machinery is called a_________-_________ chain.
heavy, muliple - strand
normal wear for a sprocket is considered exvessive when the teeth take on a _________ shape.
hooked
Another name for silent chain is _______ tooth chain
inverted
chains that are made up of a series of plates held together by pins are called ______ chains.
leaf Chain
the width of a multi-strand sprocket is indicated by a _________ in its secification.
letter
A multiple strand drive system can carry heavier loads due to its increased __________ _____________
load distibution
if chain tension is too ______ the chain will wobble off of the sprockets during operation
loss
To lubricat a chain by using an ol can or by rmoving the chain and dipping it into an oil bath is called the ________ mothod of lubrication
manual
A chain can be disconnected and reconnexted at one point through the use of a ________ ________.
master link
________strand chains are similar to standard chains but they have two or more widths.
multiple
The type of sprocket that is most often welded to a shaft is called a _______ sprocket.
no hub
Roller chain drives are very ______due to the rollers colliding with the sprocket Teeth
noisy
chain drives are lubricated by liquid lubricants called ______
oil
roller seat wear on a sprocket is indicative of an ________-designed chain drive
overloaded
The first two or three digits of the chain sizing code reveal teh ______ of the chain.
pitch
Shaft torque can be determined bu using a _____ brake and a _______
prony, scale
A chain that has too little sag can ______the efficiency of the drive system and can cause excess ______.
reduce, wear
What are two types of roller chain constructions?
riveted and Bradded
Multiplestrand chain drives are just like several standard _______chain drives side-byside
roller
_________chains are similar in construction to a roller chain except they no ______.
roller-less, rollers
_______ chains create less noise than standers chains because of their tooth shaped design
silent
the lubrication method that is required by a particular application depends primaily on the __________ and the __________of an application.
speed, load
The _______ alignment can be checked with a straight edge.
sprocket
In a chain drive _______ ratio cannot be determined by the pitch diameters of the sprockets. Sprocket ratio is the ratio of the number of teeth of the driven sprocket divided by that of the driver sprocket.
sprocket, driven, driver
two _________ and a _________ are the three basic components of a chain drive system.
sprockets, chain
Chain sag can be measured using a ______ edge and a _______.
straight, ruler
the _______ method of lubrication uses a pump to force lubricant onto the chain
stream
the bath method of lubrication is where a chain in an ecvlosed case is _______ into a bath of oil.
submerged
Shaft speed is measured using a _______.
tachometer
The speed and ______ of a driven sprocket can be determined from those same values of the driver sprocket and the sprocket ratio.
torque
The oil stream method is ________
type C lubrication system
on a horizontally oriented drive, it is very important for the sag to be on the _________ strand.
upper
Chain drive lubricants vary in their thickness which is called________.
viscosity