INDUSTRY COMPONENT

Scale/grating

Precision scale or grating component used in position sensors for accurate linear or angular measurement in industrial machinery.

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Component Specifications

Definition
A scale or grating is a precision-engineered component featuring a series of equally spaced lines or marks on a substrate, forming a periodic pattern. In position sensors like encoders and interferometers, it serves as the reference element against which a readhead or optical system measures displacement. The component's accuracy directly determines the resolution and repeatability of the position measurement system, making it critical for applications requiring micron or sub-micron precision in industrial automation, CNC machinery, and coordinate measuring machines.
Working Principle
The scale/grating works by creating a periodic pattern (lines, grooves, or reflective/non-reflective areas) that interacts with a readhead. In optical encoders, light passes through or reflects off the pattern, generating a sinusoidal signal as the scale moves relative to the readhead. This signal is converted into digital pulses to determine position. In interferometers, the grating diffracts laser light, creating interference patterns that measure displacement with extreme accuracy based on wavelength counting.
Materials
Typically made from glass (e.g., borosilicate for low thermal expansion), stainless steel, or ceramic substrates. The grating pattern is applied via chrome deposition, etching, or diamond turning for high precision. Coatings may include anti-reflective or protective layers.
Technical Parameters
  • Pitch 20 μm to 200 μm
  • Length Up to 30 meters
  • Resolution 0.1 μm to 10 μm
  • Signal Output Incremental or absolute
  • Accuracy Grade ±1 μm/m to ±5 μm/m
  • Operating Temperature -10°C to 60°C
Standards
ISO 230-2, DIN 862

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Scale/grating.

precision scale optical grating encoder scale linear encoder position sensor metrology industrial automation CNC measurement Scale/grating Scale/grating in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Position Sensor (Encoder/Interferometer)

A precision measurement device that detects and reports the exact position of a moving element within a positioning system.

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Engineering Analysis

Risks & Mitigation
  • Contamination (dust, oil) affecting accuracy
  • Thermal expansion causing measurement drift
  • Mechanical damage to grating lines
  • Misalignment during installation
FMEA Triads
Trigger: Contamination buildup on grating surface
Failure: Signal degradation or loss, leading to inaccurate position readings
Mitigation: Use protective seals, regular cleaning with approved solvents, and install in clean environments
Trigger: Thermal expansion mismatch between scale and machine base
Failure: Measurement errors due to dimensional changes
Mitigation: Select low-expansion materials (e.g., ceramics), apply temperature compensation algorithms, or use reference scales

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±1 μm per meter for high-grade scales, per ISO 230-2
Test Method
Laser interferometry, optical comparator analysis, and environmental testing for thermal stability

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between a scale and a grating in position sensors?

A scale typically refers to a linear or rotary component with marked lines for incremental measurement, while a grating often denotes a finer, periodic structure used in optical systems for diffraction-based measurement, though the terms are sometimes used interchangeably in industry.

How do I select the right scale/grating for my application?

Consider resolution requirements, environmental conditions (temperature, contamination), material compatibility (thermal expansion), length, and signal type (incremental vs. absolute). Consult manufacturer datasheets and industry standards like ISO 230-2 for guidance.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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