Mechanical calculators

Bolted joints, bearings, shafts, springs, pressure vessels and fits, worked with the formula and its limits beside the answer.

• Bolt torque and preloadPreload and tightening torque for ISO metric bolts by the VDI 2230 method, with property class, friction, proof load and preload scatter.
• Engine BMEP, torque and powerSwept volume, brake mean effective pressure, torque, mean piston speed and specific power of a reciprocating engine from bore, stroke, cylinders and rpm.
• Engine power and SFOC to ISO 3046 conditionsISO 3046-1 power adjustment factor α and fuel consumption factor β between reference and site ambient conditions, with the fuel LCV correction.
• Helical compression springSpring rate, deflection, shear stress with the Wahl factor, solid height and buckling check for round-wire compression springs.
• Hydraulic cylinder force and speedPush and pull force, extend and retract speed, regenerative mode, hydraulic power, oil volumes and rod buckling margin from bore, rod, pressure and flow.
• Interference fitContact pressure, torque and axial force capacity, bore stresses and shrink-fit temperature of a hub on a solid or hollow shaft.
• Lifting sling and wire rope loadSling leg tension from load, legs and angle or geometry with dynamic and hitch factors; chain, wire-rope or rated WLL; utilisation and maximum load.
• Pipe wall thickness (ASME B31.3)ASME B31.3 pressure design thickness, allowances and mill tolerance, nominal wall required, schedule check and MAWP of the available wall.
• Rolling bearing L10 life (ISO 281)Basic rating life in revolutions and hours from dynamic load rating, equivalent load and speed, with reliability and lubrication factors.
• Shaft torque, power and diameterTorque from power and speed, shear stress and twist of solid or hollow shafts, required diameter, combined bending, and the IACS UR M68 rule diameter.
• Tank volume and partial fillTotal and partial volume of cylinders, spheres and rectangular tanks at a liquid level, level for a target volume, mass from density and free-surface moment.
• Thin-wall pressure vesselHoop and longitudinal stress in cylinders and spheres, Lamé thick-wall check, ASME VIII-1 required thickness and MAWP with joint efficiency and corrosion.
• Tolerance stack-upWorst-case, root-sum-square and Monte Carlo results of a dimension chain, with the share of each dimension and the yield against limits.
• Vibration isolation and severityIsolator natural frequency and transmissibility of a machine on resilient mounts, and the ISO 10816-3 evaluation zone of a measured vibration velocity.