An Angle Encoder with Integral Bearing is a precision measuring system that combines two key functions in one compact unit:

1. High-accuracy angle measurement (encoder function)
2. Mechanical support and guidance (bearing function)

This design is used in CNC machine tools, rotary tables, metrology equipment, robotics, and other applications where extremely precise angular positioning is required.

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Technical Explanation

1. Encoder Function (Angle Measurement)

• The angle encoder is a sensor system that measures the rotational position of a shaft or axis.
• It consists of a graduated scale (usually glass, steel, or ceramic with fine optical or magnetic markings) and a scanning unit that reads these markings.
• The encoder produces a digital or analog signal that corresponds to the angular position.
• High-end optical encoders used in machine tools can achieve sub-arcsecond resolution (better than 0.0003°).

2. Integral Bearing Function

• Instead of being mounted on a separate machine bearing, the encoder itself contains a high-precision bearing assembly.
• The bearing supports the rotating encoder disk (scale) and provides stiffness, concentricity, and smooth running.
• Typical bearings are preloaded angular contact bearings that eliminate play (backlash) and ensure constant stiffness across operating ranges.
• The bearing absorbs external mechanical loads (radial and axial), so the encoder scale remains stable relative to the scanning head.

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Why Combine Encoder + Bearing?

In conventional setups:

• The encoder is mounted on a shaft supported by external machine bearings.
• Any bearing play, runout, or thermal deformation introduces errors into the encoder signal.

With an integral bearing encoder:

• The encoder scale and scanning head are mounted in one rigid assembly, supported by its own bearing.
• This means the measurement is directly linked to the rotation without error from external bearings.
• The encoder is effectively the bearing of the axis, so measurement accuracy equals the true motion accuracy.

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Technical Advantages

1. High System Accuracy
   • Because bearing errors (radial runout, axial movement) are eliminated, the encoder measures the actual angular position without mechanical distortion.
2. Simplified Machine Design
   • No need for a separate precision bearing + encoder combination; reduces components and alignment complexity.
3. Stiffness and Load Capacity
   • Integral bearings are designed to carry specified loads (from workpiece, table, spindle), ensuring high rigidity.
4. Thermal Stability
   • Preloaded bearing + stable scale materials reduce error from temperature changes.
5. Compactness
   • Encoder and bearing in one compact unit save installation space.

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Applications

• CNC rotary tables and indexing heads – ensures precise angular positioning.
• 5-axis machining centers – for rotary axes (A, B, C) requiring high angular accuracy.
• Metrology and calibration devices – where traceable angular accuracy is essential.
• Semiconductor & optics manufacturing – for wafer positioning and optical alignment tasks.

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In short:
An Angle Encoder with Integral Bearing is a high-precision rotary measuring system where the encoder and a preloaded precision bearing are integrated into one assembly. This design eliminates errors from external bearings, provides both support and measurement, and achieves extremely high angular accuracy in demanding machine tool and metrology applications.