Question 1
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. (a) State one workshop operation which renders each of the following practices
dangerous:
(i) wearing/keeping long hair;
(ii) wearing sandals.
(b) State two reasons for using grey cast iron in making machine beds.
(c) List three desirable properties of cutting fluids.
(d) (i) Name the two types of lathe steadies.
(ii) State one main use of steadies.
Observation
Most of the candidates who attempted this question could not provide the required responses to parts (b) and (d) 0f the question. The required responses to these part are as given below.
(b) Reasons why grey cast iron is used in making machine beds
It withstands compressive stresses.
It is self-lubricating.
It is easily cast.
It is hard and resistant to wear.
It has excellent vibration damping property.
(d) (i) Types of lathe steadies
Fixed steady
Travelling steady
(ii) Main uses of steadies
It is used for supporting long slender work.
It is used to prevent the workpiece for vibrating in the middle
It is used to resist the cutting force of the cutting tool.