77) In lathe, carriage and tail stock are guided on

Answer is:

Different guideways

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78) The unit of a lathe which houses the lathe spindle and control levers for speed selection is called

Answer is:

Head stock

79) Half nut is connected with

Answer is:

Thread cutting on Lathe

80) Lathe bed is made out of

Answer is:

Cast iron

Explanation:

Cast iron is commonly used for machinery housings or base due to its damping characteristics. It is also known for holding its shape when it is subjected to contraction and expansion due to temperature fluctuations. Hence lathe bed is usually made up of cast iron.