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SARATH REDDY ANDLURU

why shafts are generally circular rather square or rectangular?

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For a journal bearing surface, it is obvious that a circular surface is essential; a square section in a square hole would not turn. A square section in a large round hole would have contact at 4 points at most, very little load bearing area.

If we are going to use a circular section at a bearing, then there is no point at all to using a square section between the bearings. A square section would be heavier, and only a slight bit more stiff. The square section would require more material for no real benefit.

Square or other polygon shapes are used for special situations, but only where the is an evident advantage in doing so.

DrD

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For a journal bearing surface, it is obvious that a circular surface is essential; a square section in a square hole would not turn. A square section in a large round hole would have contact at 4 points at most, very little load bearing area.

If we are going to use a circular section at a bearing, then there is no point at all to using a square section between the bearings. A square section would be heavier, and only a slight bit more stiff. The square section would require more material for no real benefit.

Square or other polygon shapes are used for special situations, but only where the is an evident advantage in doing so.

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