GearLab
Precision engineering calculators for gearbox design, analysis & selection.
kW
RPM
→
—N·m
Engineering Calculators
Click any module to open the full calculator
Gear Geometry
Spur Gear
Module, teeth, pressure angle → PCD, OD, root dia, center distance, contact ratio.
Helical Gear
Helix angle, normal/transverse module, lead, axial pitch and all helical geometry.
Bevel Gear
Straight bevel geometry for 90° shafts — cone angles, mean PCD, face angle, virtual teeth.
Worm & Worm Wheel
Lead angle, centre distance, sliding velocity, efficiency and self-locking check.
Rack & Pinion
Linear travel per rev, linear speed, tangential force, stroke time and rack tooth geometry.
Profile Shift
x-coefficients → working pressure angle, modified centre distance, tip/root dia, contact ratio.
Power & Drive
Power & Torque
Any 2 of kW / Torque / RPM → third. Tangential, radial, and axial gear forces.
Gear Ratio & Speed
Single, two-stage, three-stage, and planetary gear ratio. Output RPM at each stage.
Design & Analysis
Stress Analysis
Lewis bending stress and Hertz contact stress. Safety factor check against allowable.
Service Factor
AGMA application factor, shock load classification, and gearbox life expectancy estimator.
Lubrication
Oil Viscosity Selection Coming Soon
ISO VG grade selection based on operating speed, load, and temperature range.
Thermal Rating Coming Soon
Gearbox thermal power rating, oil sump temperature rise, cooling requirements.
Oil Volume Estimator Coming Soon
Recommended oil fill quantity based on gearbox geometry and immersion depth.
Churning Loss Coming Soon
Power lost to oil churning as a function of pitch line velocity and immersion depth.
Bearings
Bearing Life L10 Coming Soon
ISO 281 basic rating life. Dynamic load capacity, equivalent load, fatigue life in hours.
Bearing Load Analysis Coming Soon
Radial and axial bearing reaction forces from gear tangential, radial, and axial loads.
Shaft Alignment Coming Soon
Allowable misalignment, parallel offset, angular misalignment tolerances and corrections.
Shafts & Keys
Shaft Design Coming Soon
Minimum shaft diameter for bending + torsion, ASME design equations, safety factor.
Critical Speed Coming Soon
Rayleigh-Ritz method for first critical speed. Operating RPM vs. critical speed ratio.
Keyway Stress Coming Soon
Shear and compressive stress on parallel key. DIN 6885 key selection, hub bore check.
Torsional Stiffness Coming Soon
Shaft angular deflection under torque. GJ/L stiffness, twist angle, resonance avoidance.
Materials
Material Selector Coming Soon
Steel grade lookup by application: case-hardened, nitrided, induction, through-hardened.
Hardness Converter Coming Soon
Convert between HRC, HRB, HV, HB, MPa (UTS). AGMA gear material grade reference.
Tools
Unit Converter
Power, torque, speed, length, force, pressure — all engineering units in one place.
Engineering Guide
Reference formulas, standard module table, pressure angles, AGMA standards overview.
Quick Reference — Standard Modules (ISO 54)
Module (m) is the fundamental size parameter of a gear tooth. A larger module means larger, stronger teeth.
Standard modules follow a preferred number series — always select from this table for interchangeability.
Pitch Circle Diameter = m × z | Addendum = m | Whole Depth = 2.25m