Free Gearbox Simulator & Multi-Stage Speed Reduction Designer

Simulate mechanical gearboxes directly in your browser without expensive engineering licenses. Build multi-stage speed reducers and speed increasers using spur gears, internal ring gears, and racks. Adjust input motor RPM, monitor rotation directions, and verify clearance dynamically.

Key Features

• Interactive real-time physics engine simulating gear teeth meshing continuously
• Adjust input RPM from 1 to 1000 RPM with instant visual feedback
• Forward and reverse direction toggling to observe gear train kinematics
• Calculates cumulative gear ratios and mechanical torque advantage
• Export the complete gearbox layout directly to CAD DXF and vector SVG
• Runs locally in your browser for zero latency and complete privacy

Frequently Asked Questions

How do I build a 10:1 speed reducer in the gearbox simulator?

You can achieve 10:1 in a single stage with a 10-tooth pinion driving a 100-tooth gear, or in two compound stages (e.g. 10:30 followed by 10:33 on shared axles) for a much more compact physical footprint.

Can the simulator detect gear collisions or binding?

GearDXF automatically calculates and snaps connected gears to their exact mathematical center distance, ensuring teeth mesh tangentially along their pitch circles without interference.

Can I export the simulated gearbox for laser cutting?

Yes, switch to the Export tab to download all gears nested on a single cutting sheet or arranged in their assembled positions.