Resources
Engineering Resources
22 open-source calculators for mechanical engineers and product designers. Every tool runs client-side, no sign-up required.
Fasteners & Joints
Bolted, pressed, welded and dimensional joint analysis.
Fastener Calculator
VDI 2230 bolt torque, preload, surface pressure, thread stripping, and joint stiffness.
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Press Fit Calculator
Interference fit analysis: contact pressure, assembly force, and hub stress for shaft-hub connections.
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Weld Joint Calculator
Fillet and butt weld stress analysis per Eurocode 3 and AWS D1.1 standards.
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Tolerance Stack-Up
Worst-case, RSS, and Monte Carlo tolerance analysis for dimension chains with contribution breakdown.
Open toolDrives & Motion
Power transmission, motion profiles and control sizing.
Gear Train Calculator
Spur, planetary, harmonic, cycloidal, and worm drive sizing: ratio, torque, and efficiency for multi-stage trains.
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Belt & Chain Drive Calculator
V-belt, timing belt, and roller chain drive sizing.
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Cam Profile Designer
Motion laws, pressure angle, curvature analysis for disk cams.
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Motor Sizing
Load inertia and motion profile analysis for servo and stepper motor selection.
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PID Tuning Simulator
Interactive step response, Bode plot, and auto-tuning rules for PID controllers.
Open toolRobotics
Kinematics and workspace tools for serial & cable robots.
Structural & Fatigue
Strength, stability, fatigue and dynamic isolation.
Beam Deflection
Interactive bending moment, shear force, and deflection diagrams for common beam configurations.
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Shaft Fatigue Analyzer
DIN 743 shaft strength verification with notch effects and Goodman correction.
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Column Buckling Calculator
Euler, Johnson, Eurocode 3 with standard steel profiles.
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Bearing Life Calculator
ISO 281 bearing life (L10/L10m) for ball and roller bearings.
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Spring Design
Compression, extension, and torsion spring sizing with stress and fatigue life estimation.
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Hydraulic Cylinder Calculator
ISO 3320 cylinder sizing, Euler buckling, Lamé wall thickness.
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Vibration Isolator Calculator
SDOF transmissibility, natural frequency, mount selection.
Open toolThermal & Fluids
Heat transfer and pipe flow design tools.
Utilities
General-purpose engineering helpers.
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