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Answer any three of the following: (i) Explain the difference between a clearance hole and a tapping size hole in drilling - Leaving Cert Engineering - Question b - 2021
Question b
Answer any three of the following: (i) Explain the difference between a clearance hole and a tapping size hole in drilling. (ii) Identify two safety features incorpo... show full transcript
Worked Solution & Example Answer:Answer any three of the following: (i) Explain the difference between a clearance hole and a tapping size hole in drilling - Leaving Cert Engineering - Question b - 2021
Step 1
Explain the difference between a clearance hole and a tapping size hole in drilling.
Answer
A clearance hole is a hole that is larger than the diameter of a screw or bolt, allowing for movement without threading. It is used to enable the screw or bolt to pass through without causing any obstruction.
In contrast, a tapping size hole is specifically drilled to allow for the threads of a screw or bolt to be cut on the inside surface of the hole, which means it is smaller in diameter than the clearance hole and provides a tight fit for the threaded component.
Step 2
Identify two safety features incorporated into a horizontal bandsaw.
Answer
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Blade Guard: This feature covers the blade to protect operators from accidental contact, reducing the risk of injury.
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Feed Rate Control: This allows the operator to adjust the speed at which the material is fed into the saw, helping to prevent jams and ensuring a smooth cutting process.
Step 3
Explain two ways in which cutting fluids help the machining process.
Answer
Cutting fluids serve several important functions in machining:
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Heat Reduction: They help keep the material and cutting tools cool, which prevents excessive heat build-up that could affect the quality of the cut and damage the tools.
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Lubrication: Most cutting fluids contain additives that help to lubricate the cutting process, which reduces friction and wear on the cutting tools, allowing for smoother operations and extended tool life.