Free Compound Gear Generator | Stepped Multi-Stage Speed Reduction

Achieve massive speed reductions in tiny mechanical footprints. In a compound gear set, two gears of different sizes are fixed together on a common rotating shaft. GearDXF makes configuring, simulating, and exporting compound multi-stage gear reductions simple and visual.

Key Features

• Seamless axle-locking mode to bind multiple gears onto common shafts
• Calculates cumulative gear stage reductions (Ratio = R1 × R2 × R3)
• Visualizes relative speeds and torque multiplication dynamically
• Outputs individual DXF layers or nested cutting sheets for fabrication
• Custom backlash, keyways, and spoke cutouts for both small and large gears
• 100% free with no calculation limits or account gates

Frequently Asked Questions

What is a compound gear?

A compound gear consists of two gears of different tooth counts locked to the same shaft or rotation axis, rotating at the exact same RPM and transmitting torque between parallel stages.

How do you calculate the ratio of a compound gear train?

Multiply the ratios of each individual meshing stage: Total Ratio = (Teeth_driven1 / Teeth_driver1) × (Teeth_driven2 / Teeth_driver2).

How do I physically fabricate a compound gear?

You can 3D print both gears as a single stepped solid body, or machine two separate gears and pin, key, or press-fit them together onto a common shaft.