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31 Cards in this Set
- Front
- Back
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Chains are considered a _________ drive. |
Positive |
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Chains are highly efficient; about _______% or better. |
98 |
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List two limitations of a chain: |
- They do not slip on overload - Adequate lubrication is often difficult to maintain |
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What are two main designs of power transmission ? |
Roller chain Silent chain |
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What two basic types of links are used in a roller chain ? |
Press fit Slip fit |
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What are the two types of connecting links, and which one reduces the working load of the chain? |
- single pitch offset link - two pitch offset link
Slip fit is weaker by 30 % |
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Another name for a single pitch offset link is __________. This will change the length by _______ pitch or pitches. |
Half link One |
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Which type of chain is heavier side plates? |
Heavy duty chain |
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Double strand chain is approximately ______ times strong than single strand. |
1.7 |
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Name two types of pre-lube chains: |
- Sintered bushing chain - O-Ring chain |
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What is an advantage of double pitch chain over standard pitch? |
It is light and more economical |
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Silent chain is also called _____________. |
Timing chain |
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What are three silent chain designs ?
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A. Centre guide B. Side guide C. Duplex (For serpentine drives) |
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Duplex chain is another name for____________________________. |
Serpentine drive chain |
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The slip fit connector link reduces the strength of chain by _____%. |
30 |
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The two-pitch offset changes the length of chain by ____________. |
Two pitches |
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For Low speed drives, the chain sag should be set at ____% to ____% of the centre distance. |
4% to 6% |
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What is the minimum chain wrap angle required to carry a full load ? |
120 degrees |
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When should you inspect the sag after a new install? |
After 8hrs of operations |
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What is the primary cause of chain wear? |
Lack of lubrication |
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What are the three methods of chain lubrication? ( include the recommended speeds) |
A. Manual or drip feed under 600 ft. per min.
B. Bath lubrication is intended for chain operation of 1500 ft. per min.
C. Forced lubrication heavily loaded drives operations above the limits of bath lubrication. |
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Where is the best place to apply lubricant to a chain ? |
Apply to inside of span so that oil is forced into chain by centrifugal force. |
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At what percentage elongation should you replace a the chain? |
3% |
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If fatigue cracks show up early, what might be the cause ? |
This is due to the pitting from the chain being exposed to corrosives. |
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One of the main reasons the chain starts to jump on the sprocket: |
Elongation |
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Odd number tooth sprocket is also known as a ________________. |
Hunting tooth sprocket |
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When you have less that 25 teeth on a sprocket, it should be___________. |
Hardened |
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What are the four types of sprocket hubs ? |
A. Sheer pin hub B. Tapered bore hub C. Straight bore hub D. Keyless adapter hub |
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What causes chain wrap up ? |
To much sag. Too little tension |
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What type of master link does not reduce the strength of the chain? |
Press fit |
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This sprocket looks like ta normal one, but has a slightly larger pitch: |
Double pitch sprocket |
