In rotary encoders with integral bearing and stator coupling, the graduated disk of the encoder is connected directly to the shaft to be measured. The scanning unit is guided on the shaft via ball bearings, supported by the stator coupling. During angular acceleration of the shaft, the stator coupling must absorb only that torque resulting from friction in the bearing, thereby minimizing both static and dynamic measuring error. Moreover, the coupling mounted on the stator compensates axial motion of the measured shaft. Other benefits of the stator are:

  • Simple mounting
  • Short overall length
  • High natural frequency of coupling
  • Hollow-through shaft possible

HEIDENHAIN - Measurement and Control Technology for Demanding Positioning Tasks

Sealed linear encoders

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Fax: (253) 853-5847


The KGM grid encoders dynamically tests the contouring accuracy of CNC-controlled machine tools. It can perform, for example, circular interpolation tests with radii ranging from 115 mm down to 0.1 mm at feed rates up to 80 m/min. The KGM can also perform free-form tests in two axes. The advantages of the KGM include its contact-free measurement, which eliminates the influence of ball bearings such as with the DBB. Also, the error resulting from the machine's geometry has no influence on the results of circular interpolation tests with very small radii.

Length Gauges

CNC Controls

KGM 181, KGM 182, and KGM 282 grid encoders

HEIDENHAIN angle encoders are characterized by high accuracy values in the arc second range and better.

Examples for application:

  • Rotary tables on machine tools
  • Swivel heads on machine tools
  • C axes on lathes
  • Gear-testing machines
  • Printing units of printing machines
  • Spectrometers
  • Telescopes

Touch probes for machine tools

With over 100 years in the precision measurement industry, HEIDENHAIN is setting the future standards of position feedback accuracy today. Our primary industries are metalworking, machine tool, semiconductor and electronics, motor/drive, general automation, and medical, but can be of service anywhere highly dependable precision measurement and motion control is needed. Let's talk about what you need - and how we can help you.

Subsequent Eelectronics

Measuring angles with rotary encoders

​​​CNC Machine Tool Laser Calibration & Alignment Service Specialists

Sealed linear encoders from HEIDENHAIN are protected from dust, chips and splash fluids and are ideal for operation on machine tools. The aluminum housing of a HEIDENHAIN sealed linear encoder protects the scale, scanning carriage, and its guideway from chips, dust, and fluids. Downward-oriented elastic lips seal the housing. The scanning carriage travels along the scale on a low friction guide. It is connected to the external mounting block by a coupling that compensates unavoidable misalignment between the scale and guideways.

Sealed linear encoders are available with full-size scale housings for high resistance to vibration up to 30 m measuring length, as well as slimline scale housing for limited installation space up to 1240 mm measuring length; with mounting spar up to 2040 mm.

Length gauges from HEIDENHAIN offer high accuracy over the entire measuring range, are mechanically rugged, and can be used in a great variety of applications. They have a wide range of applications in production metrology, in multipoint inspection stations, measuring equipment monitoring, and as position measuring devices. They are characterized by their robust design, high accuracy and large measuring ranges.

Measuring angels with angle encoders

HEIDENHAIN has been developing and manufacturing touch probes for workpiece and tool measurement on machine tools for over 30 years now, in particular for milling machines and machining centers. The setup, measuring and monitoring functions of the touch probes can be fully automated and help to reduce costs. TS triggering touch probes handle the measurement of workpieces, while TT touch probes and TL laser systems are available for the measurement of tools.

For milling machines, milling/turning and machining centers

  • Form a complete product line with their various features
  • Control machines with up to 19 axes
  • Their Kartext conversational programming capability is suited for the workshop floor
  • Can also be programmed externally
  • Are also suited for automated production
  • Are the correct choice for everything form simple milling procedures to high-speed milling

The contouring control for lathes:

  • Ideal for both CNC and cycle lathes
  • Enables the familiar manual production of simple workpieces
  • Supports programming with many cycles
  • It's smart. Turn feature offers form and graphics supported programming for complicated workpieces
  • Performs complementary milling and drilling operations in a single fixture
  • Also supports vertical lathes
  • Suited for digital or analog drive control

Interface Electronics

Interface electronics from HEIDENHAIN adapt the encoder signals to the interface of the subsequent electronics. They are used when the subsequent electronics cannot directly process the output signals from HEIDENHAIN encoders, or if additional interpolation of the signals is necessary.

Digital Readouts

Digital readouts serve to visualize the values measured with linear encoders, length gauges, rotary encoders or angle encoders. Areas of application include:

  • Measuring and inspection equipment
  • Dividing apparatuses
  • Monitoring of measuring equipment
  • Manual machine tools
  • Measuring machines

Typical characteristics of the user-friendly designed digital readouts:

  • Highly readable, alphanumeric display
  • Simple, logically arranged keypad
  • Ergonomically designed push-button keys
  • Splash-protected front panel
  • Sturdy die-cast housing

Evaluation Electronics

Evaluation electronics for metrology applications offer numerous functions for measured data acquisition and statistical evaluation of measured values.

Measuring and test equipment

HEIDENHAIN encoders provide all information necessary for commissioning, monitoring and diagnostics. PWM inspection devices and PWT testing devices are available specifically for analyzing the encoders. Testing devices are used for checking the function of encoders.