Describe any two of the following terms in relation to limits and fits:
(i) Tolerance;
(ii) Interference fit;
(iii) Upper limit - Leaving Cert Engineering - Question 7 - 2012
Question 7
Describe any two of the following terms in relation to limits and fits:
(i) Tolerance;
(ii) Interference fit;
(iii) Upper limit.
A hole and shaft are manufactured t... show full transcript
Worked Solution & Example Answer:Describe any two of the following terms in relation to limits and fits:
(i) Tolerance;
(ii) Interference fit;
(iii) Upper limit - Leaving Cert Engineering - Question 7 - 2012
Step 1
Describe any two of the following terms in relation to limits and fits: (i) Tolerance
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Answer
Tolerance is defined as the amount by which a dimension is allowed to deviate from the nominal size. It is crucial in manufacturing to ensure parts fit together properly. To calculate tolerance, subtract the lower limit from the upper limit.
For example, if a part is designed to be 50 mm with a tolerance of ±0.06 mm, the permissible dimensions would range from 49.94 mm to 50.06 mm.
Step 2
Describe any two of the following terms in relation to limits and fits: (ii) Interference fit
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Answer
An interference fit occurs when the size of the shaft is larger than the size of the hole. This type of fit ensures a tight fit between components, typically requiring force to assemble. Interference fits are often used in applications where precise alignment and high strength are critical, such as gears on shafts.
Step 3
State the: (i) Nominal diameter of the hole
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Answer
The nominal diameter of the hole is 51.00 mm.
Step 4
State the: (ii) Smallest diameter of the hole
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Answer
The smallest diameter of the hole is 50.81 mm.
Step 5
State the: (iii) Largest diameter of the shaft
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Answer
The largest diameter of the shaft is 50.06 mm.
Step 6
State the: (iv) The type of fit which will result from the assembly of the smallest hole and the largest shaft
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Answer
The type of fit resulting from this assembly will be a clearance fit, as the diameter of the hole is larger than that of the shaft.
Step 7
Name and give one application for any three of the instruments shown (i)
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Answer
Engineers protractor - used for accurately marking out angles, especially in precision engineering.
Step 8
Name and give one application for any three of the instruments shown (ii)
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Depth gauge - utilized for measuring the depth of holes, slots, or shoulders in components, ensuring the correct dimensions are achieved during manufacturing.
Step 9
Name and give one application for any three of the instruments shown (iii)
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Answer
Radius gauges - applied for checking internal and external radii on components, which is essential for ensuring proper fit during assembly.
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