7. (a) Describe any two of the following:
(i) Interference fit,
(ii) Clearance fit,
(iii) Upper limit - Leaving Cert Engineering - Question 7 - 2019
Question 7
7. (a) Describe any two of the following:
(i) Interference fit,
(ii) Clearance fit,
(iii) Upper limit.
(b) A hole and shaft assembly is manufactured to the dimen... show full transcript
Worked Solution & Example Answer:7. (a) Describe any two of the following:
(i) Interference fit,
(ii) Clearance fit,
(iii) Upper limit - Leaving Cert Engineering - Question 7 - 2019
Step 1
Describe any two of the following:
(i) Interference fit
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Answer
An interference fit produces a tight fit where both parts require force during assembly. This fit is intended for applications where precision is critical, ensuring that the two components cannot be easily separated without force.
Step 2
(ii) Clearance fit
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Answer
A clearance fit produces a loose fit. When the largest shaft can fit into the smallest hole, a clearance fit is achieved. This allows mechanical components to move freely and is often used in applications where some level of movement is necessary.
Step 3
State the:
(i) Nominal diameter of the shaft
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Answer
The nominal diameter of the shaft is 32.00 mm.
Step 4
(ii) Largest diameter of the shaft
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The largest diameter of the shaft is 32.08 mm.
Step 5
(iii) Smallest diameter of the hole
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Answer
The smallest diameter of the hole is 31.94 mm.
Step 6
(iv) The tolerance of the hole
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The tolerance of the hole is 0.12 mm.
Step 7
Name any three of the instruments shown and give one application of each instrument named.
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Answer
The instruments are:
(i) Plug gauge - Used to check the diameter size of internal holes.
(ii) Combination set - Useful for multiple marking out exercises such as marking angles, measuring, and locating the exact centre of a round bar.
(iii) Digital Vernier calipers - Used for accurately measuring the diameter of round bars or internal diameters of holes. Measurement can be read directly from a digital display.
(iv) Feeler gauge - Used to check the gap between two parts.
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