Optical rotary (angle) encoders

High accuracy, superior metrology, easy integration.

Renishaw’s range of optical angle encoders include absolute and incremental versions, with accuracy to ±1 arc second, resolution to 0.00075 arc seconds and speeds up to 36000 rev/min.

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RESM montage

Designed for demanding rotary applications that need long-term reliability and high dynamic performance, Renishaw's absolute and incremental rotary encoders have a low cross-section and a large internal diameter to allow easy positioning around internal rotors, payloads and services. Custom sizes or even larger diameters are available on request.

Stainless steel rings feature high-accuracy graduations, a choice of either optical reference marks or a bolt-on magnetic actuator and a unique taper mount which corrects for eccentricity or diameter tolerance of the rotor/shaft. These rings are compatible with a variety of readheads and suit applications demanding excellent resistance to mechanical vibration and thermal shock.

  • RESR is compatible with RGH20, RGH34, RGH35 and RGH40 readheads. Scale types with 40 µm and 20 µm pitch are available in diameters ranging from Ø52 mm to Ø200 mm
  • RESM is compatible with SiGNUM™ and TONiC™ readheads with 20 µm scale pitch. Diameters range from Ø52 mm to Ø200 mm
  • RESA is an absolute rotary scale compatible with RESOLUTE™ readheads. Scale pitch is 30 µm and diameters range from Ø52 mm to Ø550 mm
  • REXM and REXA are ultra-high accuracy versions of RESM and RESA rings providing even higher performance, offering ±1 arc second total installed accuracy when used with dual readheads

The new ATOM™ miniature encoder is also supplied with a range of RCDM glass rotary discs in diameters from Ø17 mm to Ø108 mm with a choice of either 40 µm or 20 µm scale pitch.

All rotary encoder rings offer a very low moment of inertia ensuring that whatever the installation, the system can be positioned with minimal torque and maximum speed.

Articles

  • Case study: Ultra-accurate lens measuring systems features advanced air bearing and encoder technologies Case study: Ultra-accurate lens measuring systems features advanced air bearing and encoder technologies

    ABTech Manufacturing creates five-axis platform for nanometer/sub-arc second processing around its ultra-precision air bearings and Renishaw's SiGNUM position encoders.

    [1.6MB]
  • White paper: The accuracy of angle encoders White paper: The accuracy of angle encoders

    Many automation systems rely on precision rotary motion, such as rotary format computer-to-plate (CTP) pre-press machines, machine tool A, B & C axes, surface mount machines and wafer handling and inspection equipment. Different applications demand different combinations of performance and features to optimise their function – some require accuracy, others repeatability, high resolution or low cyclic error for velocity loop control. Typically you would select the encoder that offers the optimum balance of specification and function, and there is a bewildering array to choose from. Yet few are capable of meeting all requirements.

    [817kB]

Downloads

  • SiGNUM™ Software version 5.0.

    SiGNUM software version 5.0 (released January 2012) - required to optimise installation and set-up of SiGNUM rotary and linear encoders and provides a quick and comprehensive system calibration. The SiGNUM Si interface is connected to the PC via a mini USB connector and the software provides real-time diagnostics to simplify installation and system maintenance.

    [40.1MB]
  • SiGNUM™ software version 5.0.

    SiGNUM software version 5.0 (released January 2012) - required to optimise installation and set-up of SiGNUM rotary and linear encoders and provides a quick and comprehensive system calibration. The SiGNUM Si interface is connected to the PC via a mini USB connector and the software provides real-time diagnostics to simplify installation and system maintenance.

    [40.3MB]
  • Offline Encoder product configurator

    An offline version of the Encoder product configurator. Available for download

    [2.1MB]

Next steps

Contact us online if you require more information or you have a pricing query, or alternatively you may like to speak directly to your local Renishaw office.