In relation to limits and fits, explain any two of the following:
(i) Interference fit,
(ii) Clearance fit,
(iii) Tolerance - Leaving Cert Engineering - Question 7 - 2007
Question 7
In relation to limits and fits, explain any two of the following:
(i) Interference fit,
(ii) Clearance fit,
(iii) Tolerance.
A hole and shaft are produced to the di... show full transcript
Worked Solution & Example Answer:In relation to limits and fits, explain any two of the following:
(i) Interference fit,
(ii) Clearance fit,
(iii) Tolerance - Leaving Cert Engineering - Question 7 - 2007
Step 1
Interference fit
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Answer
An interference fit is a type of fit where there is no space between the parts. In this assembly, the shaft is always made larger than the hole it is fitted into. This fit requires force for assembly, ensuring that the components are tightly held together.
Step 2
Clearance fit
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In a clearance fit, there is a deliberate space between the two parts. The shaft is always smaller than the hole. This type of fit allows for easy assembly and disassembly, enabling relative movement between the parts.
Step 3
Nominal diameter of the hole
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The nominal diameter of the hole is 32 mm.
Step 4
Nominal diameter of the shaft
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The nominal diameter of the shaft is also 32 mm.
Step 5
Lower limit of the hole
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The lower limit of the hole is calculated using the formula:
32−0.06=31.94extmm.
Step 6
Higher limit of the shaft
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The higher limit of the shaft is calculated using the formula:
32+0.08=32.08extmm.
Step 7
Application of gauges
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Answer
Two types of gauges include:
Plug gauge - Used for checking the limits of holes by verifying whether a specific diameter fits inside the hole.
Snap gauge - Employed for checking the limits of shafts, helping to assess whether the shaft falls within specified tolerances.
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