Explain any two of the following terms in relation to limits and fits:
(i) Clearance fit
(ii) Upper limit
(iii) Transition fit
(b) A steel shaft is machined to the dimensions shown - Leaving Cert Engineering - Question Question 1 - 2016
Question Question 1
Explain any two of the following terms in relation to limits and fits:
(i) Clearance fit
(ii) Upper limit
(iii) Transition fit
(b) A steel shaft is machined to t... show full transcript
Worked Solution & Example Answer:Explain any two of the following terms in relation to limits and fits:
(i) Clearance fit
(ii) Upper limit
(iii) Transition fit
(b) A steel shaft is machined to the dimensions shown - Leaving Cert Engineering - Question Question 1 - 2016
Step 1
Explain any two of the following terms in relation to limits and fits:
(i) Clearance fit
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Answer
A clearance fit is defined as the situation when the largest shaft is smaller than the smallest hole. This fit allows for easy assembly and operation without requiring force, which means that parts can move freely. It is often used when it is essential to avoid interference between mating parts.
Step 2
(ii) Upper limit
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Answer
The upper limit is the maximum allowable size of a feature or component. For the given steel shaft, the upper limit is specified as 15.07 mm. This means that the final size of the shaft must not exceed this dimension to ensure proper fitting.
Step 3
State the:
(i) Nominal diameter of the shaft;
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Answer
The nominal diameter of the shaft is 15.00 mm.
Step 4
(ii) Minimum diameter of the shaft;
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The minimum diameter of the shaft is 14.93 mm.
Step 5
(iii) Maximum diameter of the shaft;
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Answer
The maximum diameter of the shaft is 15.07 mm.
Step 6
(iv) The tolerance on the shaft.
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Answer
The tolerance on the shaft is 0.14 mm.
Step 7
Name any three of the instruments shown and give one application for each instrument named.
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Answer
Outside calipers - Used for checking the outside diameter of round bars.
Depth gauge - Used for measuring the depth of holes, slots, or grooves.
Dial gauge - Can be used to check the concentricity of a rotating bar in a center lathe.
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