Describe any two of the following terms in relation to limits and fits:
(i) Interference fit,
(ii) Tolerance,
(iii) Lower limit - Leaving Cert Engineering - Question 7 - 2017
Question 7
Describe any two of the following terms in relation to limits and fits:
(i) Interference fit,
(ii) Tolerance,
(iii) Lower limit.
A hole and shaft assembly is manufa... show full transcript
Worked Solution & Example Answer:Describe any two of the following terms in relation to limits and fits:
(i) Interference fit,
(ii) Tolerance,
(iii) Lower limit - Leaving Cert Engineering - Question 7 - 2017
Step 1
(i) Interference fit
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Answer
Interference fit occurs when the smallest shaft is larger than the largest hole. This type of fit requires significant force for assembly, ensuring a tight, secure connection between components.
Step 2
(ii) Tolerance
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Tolerance is the allowable variation in dimensions, described as the difference between the upper and lower limits. For example, a component with a dimension of 15.00 mm could have a tolerance of ±0.07 mm, meaning the acceptable size would range from 14.93 mm to 15.07 mm.
Step 3
(i) Nominal diameter of the shaft
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The nominal diameter of the shaft is 40.00 mm.
Step 4
(ii) Smallest diameter of the shaft
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The smallest diameter of the shaft is 39.95 mm.
Step 5
(iii) Largest diameter of the hole
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The largest diameter of the hole is 40.05 mm.
Step 6
(iv) The type of fit
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Answer
The type of fit that will result from the assembly of the smallest shaft and the largest hole is an interference fit.
Step 7
(i) Outside calipers
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Answer
Outside calipers are used for gauging the outside diameter of round bars.
Step 8
(ii) Vee block & clamp
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A vee block and clamp is utilized for holding round bars when drilling or marking out.
Step 9
(iii) Digital calipers
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Digital calipers are used to accurately display the inside, outside, and depth measurements of components.
Step 10
(iv) Feeler gauges
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Answer
Feeler gauges are used to accurately set the gap or distance between two surfaces, such as in spark plug adjustments.
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