7. (a) State any two ways of accurately measuring the diameter of a shaft. (b) A hole and shaft are produced to the dimensions shown. State the: (i) Nominal diameter of the hole; (ii) Largest diameter of the shaft; (iii) Smallest diameter of the hole; (iv) The type of fit which will result from the assembly of the largest shaft and smallest hole. (c) Name and give one application for any three of the instruments shown.

Leaving Cert Engineering Machining & Metrology: 7. (a) State any two ways of a

7. (a) State any two ways of accurately measuring the diameter of a shaft - Leaving Cert Engineering - Question 7 - 2008

Question 7

7. (a) State any two ways of accurately measuring the diameter of a shaft. (b) A hole and shaft are produced to the dimensions shown. State the: (i) Nominal dia... show full transcript

Worked Solution & Example Answer:7. (a) State any two ways of accurately measuring the diameter of a shaft - Leaving Cert Engineering - Question 7 - 2008

Step 1

State any two ways of accurately measuring the diameter of a shaft.

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Answer

Vernier Calipers: Vernier calipers are a measuring instrument that can be used to measure both internal and external dimensions accurately. They allow for precise readings and can measure the diameter of a shaft with a high degree of accuracy.
Micrometer: A micrometer screw gauge is another tool that provides very precise measurements. It is especially useful for measuring small diameters of shafts where high accuracy is required.

Step 2

Nominal diameter of the hole;

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Answer

The nominal diameter of the hole is 20 mm.

Step 3

Largest diameter of the shaft;

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Answer

The largest diameter of the shaft is 20.08 mm.

Step 4

Smallest diameter of the hole;

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Answer

The smallest diameter of the hole is 19.95 mm.

Step 5

The type of fit which will result from the assembly of the largest shaft and smallest hole.

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The type of fit that will result from the assembly of the largest shaft and smallest hole is an Interference fit.

Step 6

Name and give one application for any three of the instruments shown.

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Surface Plate: Used for marking out and checking flat surfaces. It provides a stable and level reference point to measure against.
Bevel Gauge: Used for checking and/or marking out angles. This tool is essential for ensuring accurate angular measurements during cutting or assembly tasks.
Vee Block: Used for holding round bars when marking out or drilling. It provides secure support for cylindrical objects, ensuring precision in drilling operations.

7. (a) State any two ways of accurately measuring the diameter of a shaft - Leaving Cert Engineering - Question 7 - 2008

Worked Solution & Example Answer:7. (a) State any two ways of accurately measuring the diameter of a shaft - Leaving Cert Engineering - Question 7 - 2008

State any two ways of accurately measuring the diameter of a shaft.

Nominal diameter of the hole;

Largest diameter of the shaft;

Smallest diameter of the hole;

The type of fit which will result from the assembly of the largest shaft and smallest hole.

Name and give one application for any three of the instruments shown.

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