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The model steering wheel shown is to be turned on a centre lathe - Leaving Cert Engineering - Question 6 - 2018
Question 6
The model steering wheel shown is to be turned on a centre lathe. (i) Name three turning operations used in the production of the steering wheel. (ii) Describe, wi... show full transcript
Worked Solution & Example Answer:The model steering wheel shown is to be turned on a centre lathe - Leaving Cert Engineering - Question 6 - 2018
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Describe, with the aid of suitable diagrams, each of the three turning operations named by you at 6(a)(i) above.
Answer
Taper Turning
Taper turning involves cutting a conical shape on a cylindrical workpiece. The lathe is set at an angle, and the tool moves along the taper line, removing material to create a gradual slope.
Facing Off
Facing off is the process of machining the end of a workpiece to make it flat and smooth. This operation is performed by holding the workpiece in the chuck and dividing the material at right angles to the axis of rotation of the lathe.
Knurling
Knurling is a process used to produce a textured pattern on the surface of the workpiece to enhance grip. A knurling tool is pressed against the rotating workpiece to create the desired pattern.
Step 3
Describe a suitable application for each of the lathe work-holding methods shown below.
Answer
Self-centering three-jaw chuck
A self-centering three-jaw chuck is commonly used to hold round or hexagonal bars securely while machining. It automatically adjusts to accommodate the shape of the workpiece, ensuring it is concentric with the spindle.
Using a centre
Using a centre involves placing a pointed spindle in the tailstock which supports the workpiece. This method is suitable for machining long bars, as it offers stability and precision during the operation.
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