Discussion
Lathe beds are usually made of:
Answer: B
Lathe beds are usually made of cast iron.
Grey cast iron suits a machine bed: it absorbs vibration well, which reduces chatter; it is stable and keeps its shape; it can be cast into the complex box sections a bed needs; and the graphite in it gives the guideways good wearing and sliding properties. It is also cheap.
Mild steel and stainless steel damp vibration poorly and are expensive to form into a bed, and an aluminium alloy is too flexible and wears too quickly for the ways of a machine tool.
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