Calculate interference fit contact pressure and required press force for shaft and hub assemblies. Based on Lame's equations for thick-walled cylinders.
Geometry
Material (same for shaft & hub)
Diametral Interference
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Contact Pressure
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Press Force (solid shaft)
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Holding Torque
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Assumes: Solid shaft, same material for shaft and hub, room temperature assembly. Contact Pressure: P = δ / (d × (C_hub + C_shaft) / E) Press Force: F = π × d × L × P × μ Typical μ: Steel/steel dry ≈ 0.12–0.15, lubricated ≈ 0.05–0.08