Describe any two of the following terms in relation to limits and fits:
(i) Lower limit,
(ii) Interference fit,
(iii) Allowance - Leaving Cert Engineering - Question 7 - 2015
Question 7
Describe any two of the following terms in relation to limits and fits:
(i) Lower limit,
(ii) Interference fit,
(iii) Allowance.
A hole and shaft assembly are manuf... show full transcript
Worked Solution & Example Answer:Describe any two of the following terms in relation to limits and fits:
(i) Lower limit,
(ii) Interference fit,
(iii) Allowance - Leaving Cert Engineering - Question 7 - 2015
Step 1
Describe any two of the following terms in relation to limits and fits: (i) Lower limit
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Answer
The lower limit is defined as the smallest dimension that is permissible when machining a component. It represents the minimum size that a feature can have in order to ensure proper functionality and assembly during manufacturing.
Step 2
Describe any two of the following terms in relation to limits and fits: (ii) Interference fit
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Answer
Interference fit occurs when the size of the shaft is greater than the size of the hole it is designed to fit into. This fit ensures that there is no clearance between the two components, requiring a force to assemble them that effectively holds them together tightly.
Step 3
A hole and shaft assembly are manufactured to the dimensions shown. State the: (i) Nominal diameter of the hole
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Answer
The nominal diameter of the hole is 20 mm.
Step 4
A hole and shaft assembly are manufactured to the dimensions shown. State the: (ii) Largest diameter of the hole
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Answer
The largest diameter of the hole is 20.06 mm.
Step 5
A hole and shaft assembly are manufactured to the dimensions shown. State the: (iii) Smallest diameter of the shaft
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Answer
The smallest diameter of the shaft is calculated as follows:
A hole and shaft assembly are manufactured to the dimensions shown. State the: (iv) The type of fit which will result from the assembly of the largest hole and the smallest shaft.
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Answer
The type of fit that will result from the assembly of the largest hole (20.06 mm) and the smallest shaft (19.92 mm) is known as a clearance fit. This fit allows for space between the shaft and the hole, facilitating ease of assembly and movement.
Step 7
Name any three of the instruments shown and give one application for each instrument named: (i)
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Answer
Engineering protractor - used for checking and marking angles.
Step 8
Name any three of the instruments shown and give one application for each instrument named: (ii)
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Answer
Vee block and clamp - utilized for holding round bars when marking out or drilling.
Step 9
Name any three of the instruments shown and give one application for each instrument named: (iii)
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Answer
Digital micrometer - used for accurate measurement of machine parts.
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