The RAM 2-Speed spindle gearbox is designed to extend the constant power range of spindle drive motors and provide:

  • High torque for hogging out steel or titanium
  • High speed for finish machining aluminum.

The RAM (High Torque) two speed gearboxes are designed for in-line integration between a water cooled motor and a spindle inside of a machine-tool RAM as shown below:


This newest generation of 2-speed gearboxes improves torque density while decreasing the outside diameter and increasing the hollow bore diameter. Furthermore, it is a kit version that eliminates redundant bearings in the design and makes the entire system operate with lower temperature, vibration and noise levels.


This compact, light-weight design matches the latest spindle drive motor technology and offers:

  • Hollow through bore to facilitate a draw bar and through spindle coolant
  • Round Housing to fit inside of RAM bore and share motor coolant supply
  • Remote hydraulic speed change compatible with CNC control
  • Quiet minimum vibration operation to match spindle requirements
  • Dry sump lubrication for minimum thermal expansion

View our other 2 speed gearbox designs here

The RAM Range consists of:

  • 6 different sizes
  • Two ratios 1:1 and 5:1
  • Power up to 400 HP @ 1500 RPM
  • Output torque up to 7400 Lb.Ft. (10,000 NM)
  • Input speeds up to 12,000 RPM
  • Speed change remote actuation by hydraulic actuator
  • Ratio Controlled by hydraulic pressure detection
  • Efficiency of 97%
  • Quiet, minimum vibration with ground and crowned gearing
  • Compact planetary design
  • Low backlash ensures position control for tool change and contour cutting
  • High torque density

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