Chains Flashcards
What are the 3 types of connecting links on a chain?
Spring clip
Cotter pin
Spring pin
What is an offset link?
A non standard link to take up variations in chain that are unable to do so with standard connecting links
What are the 4 types of sprockets
Type A, B, C, D
What is a type A sprocket
Plain bore
What is a type B sprocket
Hub on 1 side
What is a type B sockets advantage?
Can be placed closer to machinery
What is a type C sprocket?
Hub on both sides
What is a type D sprocket?
Detachable or specialty hub
What is the max chain speed?
1200fpm
What is a chains pin diameter?
5/16 of the pitch of chain
What is the chains width?
5/8 the chains pitch
What is the link plate thickness on regular chain?
1/8th of the chain pitch
What is the roller diameter of the chain?
5/8ths the pitch
What are the 3 types of chains
Regular
Light
Roller-less
What are the variations for the 3 types of chain?
0
1
5
What type of chain is 40
Regular
How is the size of chain determined in a number? Example 40 chain
First number is 1/8ths
40 = 4/8 = 1/2
How is the circumference of a sprocket found?
Number of teeth x chain pitch
How is the diameter of a sprocket found?
Circumference divided by pie (3.14)
In hub numbers (D40B15) what shows the number of strands?
The first letter
D = double
In hub numbers (D40B15) what shows the number of teeth?
Last two digits
15= 15 teeth
In hub numbers (D40B15) what shows the chain/pitch?
First two numbers
40
In hub numbers (D40B15) what shows the hub type?
The second letter
B
What are the 4 types of sprocket strands?
S, D, T, Q
What is the maximum distance the centre distance should be in terms of chains?
1.5 x the diameter of the largest sprocket
OR
NOT exceed 60x the chain pitch
What is the arc of contact for the small sprocket on a chain drive system?
120 degrees
What is the maximum ratio for chain sprockets?
3.5:1
What’s the ideal chain slack for one direction single chain?
2-4% (2 for one way 4 for both)
Where is the slack to be typically located on a chain drive
The bottom
What are the basic types of chain links?
Roller link
Pin link
How much stronger is double strand chain to single strand chain?
1.7x
Sintered bushing chains life is how much different than a roller bushing chain?
5x the life but 10% less load
How are O ring chain load capacity different?
5% less load from standard
How are rollerless chains designated?
With the use of a the number 5
What is a joining link?
Used in silent chains when an odd number of pitches is required
What is a joining link or connecting link in terms of silent chain?
Used to change the chain length by 2 pitches
What are the 3 silent chain designs?
Side guides
Centre guides
Serpentine drive
What direction should a master link be installed?
With the closed end of the spring clip in the direction of travel
How does the slopped fitted plate affect the working capacity of chain?
Reduces by 30%
What should the sag in the return strand for slow to medium speed drives?
Single deflection - 2-3%
Double - 4-6%
What should chain sac be for high speed reversing or impulse drives?
Double deflection - 2-3%
Single- 1-1.5%
What should the chain sag be on vertical drives?
Double deflection - 2-3%
Single- 1-1.5%
When should you recheck a newly installed chain?
8 hours after running
What are the three methods of chain lubrication?
A. Manual / drip feed
B. Bath
C. Forced
Where should you apply lubricant on chain?
Inside of chain
What are the 3 materials for making sprockets?
Alloy cast iron
Medium carbon steel
Plastic
What speeds are drip feed lubrication typically used for chains?
Low speed drives
600ftpm and less
What speeds are bath lubrication typically used for chains?
Approximately 1500ftpm
What speeds are forced lubrication methods typically used for chains?
Heavily loaded drives
Above 1500ftpm
What’s the difference between the configuration of double single strand sprockets and 2 strand sprockets
Double single strand - wide for 2 single strand chains
2 strand - narrow for 2 strand chain
What is a roll case?
Multiple lines of rollers attached by chains or belts with sprockets
What are idler sprockets used for? (3)
Prevent chain whip
Improve chain wrap
Tension chains
Why should you avoid using automatic take up idlers?
Chains need slack
Automated ones reduce chain life with excess wear
If you change a sprocket what else must you do?
Change the chain
What is the difference of load capacity between standard and heavy duty roller chain?
Hardly anything. Heavy duty chain just has thicker side plates
What is the pitch of #50 chain?
5/8
How much does an offset link permit shortening or lengthening of a chain?
One pitch at a time
What would an acceptable chain deflection from a span for a centre to centre distance of 36” be?
.75”
For silent chain sprocket pitch diameter of 10” what will the approximate diameter of the sprocket be?
Slightly less than 10”
How many chain links needed for a #50 chain fitting a 20 tooth and 40 tooth sprocket of 48” centres?
184
What is the proper amount of deflection UP AND DOWN of a newly installed medium speed drive chain?
4-6%
The 3 important factors when measuring a chain for replacement are what?
Pitch
Inside diameter
Roller diameter
What tools are needed to measure chain deflection?
Ruler and straight edge
How often should you inspect roller chains newly placed into service?
First 100 hours then every 500 hours thereafter
