6. (a) Name any three of the lathe parts shown - Leaving Cert Engineering - Question 6 - 2019
Question 6
6.
(a) Name any three of the lathe parts shown.
(i)
(ii)
(iii)
(iv)
(b) Explain any three of the following in relation to machining:
(i) Cutting speed,... show full transcript
Worked Solution & Example Answer:6. (a) Name any three of the lathe parts shown - Leaving Cert Engineering - Question 6 - 2019
Step 1
Name any three of the lathe parts shown.
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Answer
Slocomb drill / Centre drill
Self-centering three jaw chuck
Parting tool
Step 2
Explain any three of the following in relation to machining: Cutting speed.
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Answer
Cutting speed is defined as the speed at which the work moves with respect to the tool.
Step 3
Explain any three of the following in relation to machining: Clearance angle.
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Without a clearance angle, no cutting would take place. The clearance angle ensures that only the cutting edge of a tool makes contact with a piece. It provides clearance between the cutting tool face and the workpiece.
Step 4
Explain any three of the following in relation to machining: Tolerance.
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Tolerance is the range within which the final size of a product can lie. Tolerance is the difference between the upper and lower limits.
Step 5
Explain any three of the following in relation to machining: Cutting fluids.
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Cutting fluids are used in metal machining for a variety of reasons improving tool life, reducing the buildup of heat, improving surface finish and flushing away chips from the cutting zone.
Step 6
Name a lathe process used to produce these patterns.
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Answer
Knurling
Step 7
Describe this lathe process.
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A knurling tool is set against a piece of round section of bar. The lathe is set so that the chuck revolves at a low speed. The knurling tool is then pressed against the rotating steel and pressure is slowly increased until the tool produces a pattern on the bar.
Step 8
State two safety precautions to be observed during this lathe process.
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Have no loose clothing hanging near the turning bar on the lathe/wear PPE.
Ensure that the workpiece is securely clamped before starting.
Step 9
State three advantages of using a computer numerical control lathe (CNC lathe) rather than using a manual control lathe to produce these chess pieces.
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Easier and quicker to mass produce the piece shown on a CNC lathe.
Less chance of errors if made on a CNC lathe.
Reduced labor cost.
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