November 2019

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QUESTION 3

3.1 Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only 'True' or 'False' next to the question number (3.1.1–3.1.5) in the ANSWER BOOK.

3.1.1 The chuck provides a range of speeds at which the spindle can rotate.

3.1.2 The foundation of a lathe is the bed.

3.1.3 The saddle fits on top of the bed and is guided by the vee and flat guide ways.

3.1.4 The cross slide is on top of the compound slide.

3.1.5 The four-jaw chuck is self-centring.                                             (5 × 1)(5)

3.2 Explain the difference between manual feed and automatic feed.               (5)

3.3 Give FIVE disadvantages of a four-jaw chuck.                                          (5)

3.4 A mandrel is a shaft or tube which holds workpieces accurately in position while being machined.

Draw a double-cone mandrel. Include the fixed cone, loose cone, nut and workpiece.(5)

3.5 List FIVE malfunctions that can occur on a centre lathe while machining a workpiece (5)

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