Observation

The expected responses are as given below:

5(a)      Stages in sand casting

• Pattern preparation
• Mould preparation
• Melting of metal
• Pouring of metal
• Removal of casting
• Fetting of casting
• Machining of casting

(b)        Casting defect is an undesirable feature which occurs in casting.
(c)        The uses of the following lathe tools:
(i)         knurling tool is used to produce impression on the surface of the workpiece to give a firm hand grip.
(ii)        parting off tool is used for cutting off metal on the lathe.
(iii)       thread chaser is a lathe accessory used to finish thread cuts to shape on the lathe.
(iv)       boring tool is used on the lathe to enlarge drilled hole.