Rotary encoders and ring scales

Short Description:

The Pi20 series rotary encoders is a one-piece stainless steel ring grating with 20 µm pitch incremental graduations engraved on the cylinder and an optical reference mark. It is available in three sizes, 75mm, 100mm and 300mm in diameter. The rotary encoders have excellent mounting accuracy and feature a tapered mounting system that reduces the need for high-tolerance machined parts and eliminates center misalignment. It has the characteristics of large inner diameter and flexible installation. It uses a non-contact form of reading, eliminating backlash, torsional errors and other mechanical hysteresis errors inherent in traditional enclosed gratings. It fits the RX2 open optical encoders.


  • Outer diameter of the ring: 75mm/100mm/300mm
  • Accuracy: 15 arc second
  • Product Detail

    Product Tags

    The Pi20 series is a one-piece stainless steel ring grating with 20 µm pitch incremental graduations engraved on the cylinder and an optical reference mark. It is available in three sizes, 75mm, 100mm and 300mm in diameter. The rotary encoders have excellent mounting accuracy and feature a tapered mounting system that reduces the need for high-tolerance machined parts and eliminates center misalignment. It has the characteristics of large inner diameter and flexible installation. It uses a non-contact form of reading, eliminating backlash, torsional errors and other mechanical hysteresis errors inherent in traditional enclosed gratings.
    It fits the RX2 readhead.
    Model Outer diameter of the ring Number of lines D1

    (mm)

    D2

    (mm)

    D3

    (mm)

    N θ Readhead
    Pi20D075 75 11840 55.02±0.02 65 75.35±0.05 6 30° RX2
    Pi20D100 100 15744 80.02±0.02 90 100.25±0.05 6 30°
    Pi20D300 300 47200 280.03±0.03 290 300.3±0.1 16 11.25°

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