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Identify any three of the lathe components shown - Leaving Cert Engineering - Question 6 - 2015
Question 6
Identify any three of the lathe components shown. (i) (ii) (iii) (iv) Explain any three of the following in relation to machining: (i) Taper turning. (ii... show full transcript
Worked Solution & Example Answer:Identify any three of the lathe components shown - Leaving Cert Engineering - Question 6 - 2015
Step 1
Identify any three of the lathe components shown.
Answer
(i) Knurling Tool: This component is used for creating a textured grip on cylindrical surfaces.
(ii) Centre Drill/ Slocombe Drill: Used for creating a starting point for drilling operations, typically with a conical tip.
(iii) Parting Off Cutting Tool: This tool is designed to cut off a piece of the work material from the main body.
(iv) Fixed Steady: A support used to hold the workpiece firmly in place while machining.
Step 2
Explain any three of the following in relation to machining: Taper turning.
Answer
Taper Turning: This process is conducted on a centre lathe to produce a tapered finish on a cylindrical workpiece. The lathe’s tailstock is often adjusted to create the desired angle, ensuring a smooth and accurate reduction in diameter along the length.
Step 3
Explain any three of the following in relation to machining: Spindle speed.
Answer
Spindle Speed: This term refers to the rotational speed of the spindle, which holds the workpiece. It is typically measured in revolutions per minute (RPM). The speed can be adjusted by selecting different gears or pulley options on the lathe, influencing the machining process and the surface finish.
Step 4
Explain any three of the following in relation to machining: Cutting fluids.
Answer
Cutting Fluids: These are used during the machining process to cool and lubricate the cutting area. They help to reduce friction between the tool and the workpiece, prolong the tool life, and improve surface finish. Additionally, they can help in removing chips and debris from the cutting zone.
Step 5
Explain any three of the following in relation to machining: Feed.
Answer
Feed: This term refers to the distance moved by the cutting tool after each revolution of the workpiece. It is crucial for determining the rate of material removal and affects the final surface finish. Proper adjustment of the feed rate ensures efficient machining without causing tool wear or damaging the workpiece.
Step 6
Step 7
A chuck for use in a centre lathe is shown. Describe two applications for the chuck shown.
Answer
Application 1: Holding workpieces that require eccentric turning, allowing the user to machine different points off-center.
Application 2: It can secure square or rectangular workpieces that are not easily held by a three-jaw chuck, providing versatility for various shapes.
Step 8
A chuck for use in a centre lathe is shown. State one safety precaution to be observed when using this type of chuck.
Answer
Safety Precaution: When performing eccentric turning, ensure that the speed of the spindle is not set too high to prevent any potential accidents or damage to the workpiece.