Machine Design
According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than

1.5 d
d
2.5 d
2 d

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Machine Design
When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

Move towards right of the bearing making no metal to metal contact
Move towards right of the bearing making the metal to metal contact
Have contact at the bottom most of the bearing
Move towards left of the bearing making metal to metal contact

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