Machine elements

Power screws, journal bearings, rolling bearings, bolted joints and helical springs.

Coulomb’s friction and the power screw (1785)

Coulomb's friction and the power screw (1785)

Petroff’s law of bearing friction (1883)

Petroff's law of bearing friction (1883)

Reynolds and Sommerfeld: hydrodynamic lubrication (1886-1904)

Reynolds and Sommerfeld: hydrodynamic lubrication (1886-1904)

Lundberg and Palmgren’s rolling-bearing life (1947)

Lundberg and Palmgren's rolling-bearing life (1947)

Rötscher’s bolted-joint diagram (1927)

Rötscher's bolted-joint diagram (1927)

Wahl’s curvature factor for helical springs (1929)

Wahl's curvature factor for helical springs (1929)