Discussion
Lathe beds are made of cast iron due to following reason :
Answer: C
Lathe beds are made of cast iron because of its high damping capacity.
The graphite flakes in grey cast iron absorb vibration, so chatter from the cutting tool and the motor dies out in the bed instead of being passed to the work. Cast iron is also rigid, strong in compression, easy to cast into the complex shape of a bed, and wears well on the slideways.
Weight and cost are side effects, not the engineering reason. 'It does not resist compressive load' is false: cast iron is strong in compression, and that is a further reason it suits a bed.
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