Bevel Gear Design Generator Open the designer

ISO 23509 · ISO 10300 · STEP · mm / inch

Easy Bevel Gear Design
Based on Standards

Straight and spiral bevel gear pairs to ISO 23509, rated to ISO 10300, in millimetres or inches (diametral pitch). Exact 3D STEP files for any CAD program — and every dimension names the clause it came from.

Open the designer How it works

Free to use. A STEP file asks you to sign in with Google, and because each build is CPU-heavy an account may generate 3 a day.

Quick start
A spiral bevel gear pair, 20 and 40 teeth, over its axial section drawing, with its bending safety factor 2.93, pitting safety factor 1.70 and the three STEP files an export writes

Features

ISO 10300

Gear strength calculations

Pitting and tooth-root safety factors, updated as you type.

The Load inputs - pinion torque 250 Nm at 1500 1/min - beside the verdict cards, pitting S_H 1.25 and bending S_F 2.55 with their recommended minimums, and the rating table

Interactive input

Inputs that explain themselves

Every input comes with its figure or table. Click a value to use it.

The profile shift explanation opened from its i: the pinion and wheel teeth at x = 0.43 against no shift, and a strip along ISO 23509 Clause 8 showing where either member undercuts

2D preview

Live axial and tooth sections

Redrawn with every change. Pick the dimensions you want to see.

The axial section of a spiral bevel pair with its dimension list open - outer and outside diameters, cone distance, face width, pitch angles ticked - and the tooth section of a straight pair at the heel with its depths dimensioned

PDF report

Your results in one file

Dimensions, safety factors and loads, ready to file with the drawing.

The summary report: the load capacity table with both safety factors and stresses, and the dimension table at the heel

STEP export

Exact 3D solids for manufacturing

Pinion, wheel and pair, cut the way a generating machine cuts them — written in millimetres or inches.

The solid model of a straight bevel pair, 20 and 40 teeth, module 5, in mesh
One export bevel_z20x40_m5_pinion.step bevel_z20x40_m5_wheel.step bevel_z20x40_m5_pair.step bevel_z20x40_m5.txt

3D preview

See the pair before you build it

Turn and zoom it in the browser. No account needed.

The 3D preview of a spiral bevel pair, 20 and 40 teeth, in mesh

Checked against the standards' own examples

The spiral bevel geometry reproduces ISO 23509's worked example F.2 - its taper angles to 0.0001 degrees - and the load rating is held table by table to ISO/TR 10300-30 Sample 1, the standards committee's own worked example. Where a standard leaves something open, the page says so rather than filling it in silently. If a number disagrees with your own calculation, the disagreement is checkable: write to info@bevelgeargenerator.com.

Questions

Is it free?

Yes. The dimensions, the drawings, the 3D preview and the load rating are open to everyone without an account. Generating a STEP file builds both solids on the server, so it asks you to sign in with Google first, and each account has a daily allowance, shown beside the button.

Which standards does it follow?

ISO 23509 for the geometry of straight and spiral bevel gears, the ISO 53 basic rack for the generating tool, JIS B 1705 or ISO 23509 Table C.3 for backlash, and ISO 10300 method B1 with ISO 6336-5 allowable stresses for the load capacity of straight and spiral bevel pairs. The guides go through the design step by step.

Can I open the 3D gear model in my CAD software?

Yes. The STEP files are exact 3D solids of the pinion, the wheel and the pair in mesh, and open in any CAD program that imports STEP — SolidWorks, Inventor, Fusion 360, CATIA, NX, FreeCAD and others — ready for a drawing, an assembly or CAM.

Can I design bevel gears in inches?

Yes. The mm / in switch in the top bar puts the designer in inches: the module is entered as the diametral pitch P = 25.4 / m, lengths in inches, torque in lbf·in, stresses in psi and oil viscosity in cSt, and the STEP files, STL and dimension report are written in inches. The PDF reports stay in millimetres, because the ISO formulas they quote are written for millimetres.

What files does it produce?

STEP files of the pinion, the wheel and the pair in mesh; STL if you ask for it; a plain-text dimension report; and a summary report as PDF with the dimensions and the safety factors.

What does it not do?

Hypoid gears, face-hobbed spiral bevels and internal bevel gears are not generated, the teeth carry no crowning, and there is no loaded tooth contact analysis or scuffing rating.

Guides

How to design a bevel gear pairStraight vs spiral bevel gearsBevel gear terminologyBevel gears in CADMiter gearsBevel gear strength (ISO 10300)Minimum teeth and undercut

Size a bevel gear pair now

The designer opens on a working pair; change the teeth and the module and every figure follows.

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