Rack & Pinion Dedicated Reducers

Featured Product from Andantex USA, Inc.

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The First Family of Rack & Pinion Dedicated Reducers
Only a handful of manufacturers in the world are able to offer planetary reducers with extremely high precision achieving less than 1 arc-minute of backlash without mechanical preload. Out of this already-small group of manufacturers, only Redex-Andantex makes a family of high precision planetary reducers specifically designed for use with racks on linear axes and ring gears on rotary axes for machine tools and automation equipment.

What is a rack & pinion dedicated reducer?
A rack and pinion dedicated reducer has a pinion as the output, and is optimized to position within microns while moving large loads and providing smooth motion for in process operations (i.e. machining parts, carbon fiber placement, robot axes etc.). The parameters that the reducer design must meet in order to achieve this performance are:

  • Extremely high compound stiffness
  • Minimum transmission error for smooth operation and low noise during high speed operation
  • Compact footprint to easily integrate into machine designs
  • High efficiency
  • Minimum to ZERO-BACKLASH

The Redex-Andantex family of rack and pinion dedicated reducers achieves all of these objectives through unique design. The most important parameter in a rack and pinion drive is stiffness to provide excellent position repeatability during high accelerations and avoid resonant frequencies that make servo-control difficult. So, we have optimized the output stiffness to minimize deflection in all planes (radial, torsional, and axial) through a patented integration of the output pinion onto the output shaft.

The pinion pitch diameter is kept small, and is perfectly matched to the torsional stiffness of the planetary gear train, thereby ensuring high torsional stiffness. Large, preloaded tapered roller bearings go over the pinion and provide the radial and axial stiffness of the system. This compound stiffness minimizes the linear deflection of the drive system. The small pinion provides several additional advantages:

  • Output torque is minimized, allowing smaller servo-motors.
  • Resonant frequency, which is defined as the square root of stiffness/inertia, is increased because it is a function of the pinion pitch diameter squared.
  • Installation is simplified, thanks to the accessible pinion.

As previously mentioned, the planetary gear train provides high torsional stiffness. But, it also offers additional advantages:

  • High torque density due to the sharing of load between planet gears. This translates into a compact
  • High efficiency > 92%
  • Minimum transmission error from years of experience manufacturing hardened & ground
    planetary gearing.


Andantex USA Inc
Andantex is your source in North America for the following product categories: Servo Planetary Reducers, Mini Servo Planetary Reducers, Servo Worm Reducers, Rack and Pinion Systems and Components, 2 Speed Spindle Gearboxes, Automatic Lubrication Systems, Lifting Systems, Made to Order Large Gears, Right Angle Gearboxes, Differentials, Mechanical Clutches, Reducers & Multipliers, Magnetic Particle Brakes, Clutches & Torque Limiters, Load Cells, Transducers & Sensors, Electronics & Controllers.