Editorial Technical Reference

Linear Encoder

This page explains how Linear Encoder is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A precision measurement device that converts linear position into digital signals for feedback control in motion systems.

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Product Specifications

Technical details and manufacturing context for Linear Encoder

Definition
A linear encoder is a critical feedback component within a CNC Motion System that provides real-time, high-resolution position data of moving elements along a linear axis. It enables closed-loop control by continuously monitoring the actual position of machine slides, tables, or spindles, allowing the CNC controller to compare commanded positions with actual positions and make precise corrections to achieve accurate machining operations. This directory entry covers linear encoders used in industrial machinery, typically as part of a feedback loop for position control. The encoder consists of a scale and a read head; the scale is mounted to the stationary part of the machine, while the read head is attached to the moving element. As the moving element travels, the read head scans the scale and generates electrical signals that are processed to determine position, direction, and velocity. These signals are transmitted to the CNC controller, which uses them for closed-loop control. Linear encoders operate on optical, magnetic, or inductive principles. Optical encoders use a glass scale with fine gratings and a read head containing a light source and photodetectors; as the read head moves, light patterns create interference or moiré fringes that are converted into electrical signals. Magnetic encoders use a magnetic scale and a read head that senses changes in magnetic field. Inductive encoders use coils and a scale with conductive patterns. The choice of principle depends on the application's requirements for accuracy, resolution, and environmental resistance. The directory lists typical parameters such as measuring range from 50 to 3000 mm, resolution from 0.001 to 0.005 mm, accuracy grade per ISO 230-2, output signals TTL/HTL, supply voltage 5 V or 24 V, maximum traversing speed, operating temperature, protection class, vibration and shock resistance, cable length, and weight. These values are reference ranges and must be confirmed with the manufacturer for specific models. Always verify model-specific values and standards with the legal manufacturer or supplier before procurement.
Working Principle
Linear encoders typically operate using optical, magnetic, or inductive principles. Optical linear encoders use a scale with fine gratings and a read head with light source and photodetectors. As the read head moves along the scale, light patterns create interference or moiré fringes that are converted into electrical signals. These signals are processed to determine precise position, direction, and velocity information, which is transmitted to the CNC controller for motion feedback.
Common Materials
Glass (for optical scales), Stainless steel (for protective housing), Aluminum (for mounting brackets), Ceramic (for high-precision scales), Magnetic materials (for magnetic encoders)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Measuring Range50–3000 mmCustom lengths available on request
Resolution0.001–0.005 mmHigher resolution for precision applications
Accuracy Grade±0.005–±0.02 mmDepends on length and installationISO 230-2
Output SignalTTL/HTLDifferential or single-ended
Supply Voltage5 ±5% or 24 ±10% V DCReverse polarity protected
Max Traversing Speed5–20 m/sDepends on resolution and electronics
Operating Temperature-10–70 °CExtended range optional
Protection ClassIP54–IP67Higher IP for harsh environmentsIEC 60529
Vibration Resistance≤100 m/s²At 55 HzIEC 60068-2-6
Shock Resistance≤300 m/s²Half-sine, 11 msIEC 60068-2-27
Cable Length1–20 mShielded cable standard
Weight0.5–3.5 kgDepends on length and housing

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Scale
    Provides the reference pattern for position measurement, typically with precise graduations or magnetic patterns
    Material: Glass or stainless steel
  • Read Head
    Contains sensors that detect position relative to the scale and convert it to electrical signals
    Material: Aluminum housing with electronic components
  • Mounting Brackets Part
    Secures the encoder components to the machine structure with precise alignment
    Material: Aluminum or stainless steel
  • Signal Cable
    Transmits position data from the read head to the CNC controller
    Material: Shielded copper conductors with protective jacket
  • Protective Cover Part
    Shields the scale from contaminants like chips, coolant, and dust
    Material: Stainless steel or aluminum with sealing elements

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1.5 bar (typical), IP67/IP68 rating for environmental protection
other spec: Resolution: 0.1μm to 5μm, Accuracy: ±1μm to ±10μm, Max Speed: 3-10 m/s, Vibration: 10-30 g
temperature: -10°C to +70°C (operating), -20°C to +85°C (storage)
Media Compatibility
✓ Machine tool slides ✓ Precision assembly robots ✓ Coordinate measuring machines
Unsuitable: High-pressure washdown environments without proper sealing
Sizing Data Required
  • Required measurement resolution (μm)
  • Maximum travel length (mm)
  • Installation space constraints (mm)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Signal degradation or loss
Cause: Contamination of optical or magnetic read head by dust, oil, or debris; misalignment from vibration or mechanical shock; or wear of the scale surface.
Mechanical binding or sticking
Cause: Accumulation of particulate matter or hardened lubricants in the guideway or bearing system; corrosion due to exposure to moisture or aggressive chemicals; or physical damage to the scale or slider from impact.
Maintenance Indicators
  • Intermittent or erratic position readings, including sudden jumps or loss of signal during operation.
  • Audible grinding, scraping, or increased friction noise from the encoder assembly during movement.
Engineering Tips
  • Implement regular cleaning of the scale and read head using approved, non-abrasive methods and ensure the encoder is housed in a sealed or purged environment to prevent contamination.
  • Maintain proper alignment and mounting rigidity, use vibration-damping mounts if needed, and follow manufacturer-specified lubrication schedules with compatible lubricants to prevent mechanical wear.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 230-2:2014 (Test code for machine tools - Determination of accuracy and repeatability of positioning of numerically controlled axes) IEC 60068-2-6:2007 (Environmental testing - Vibration)

Quoted from the published standard.

Manufacturing Precision
  • Linear accuracy: ±0.005 mm/m
  • Repeatability: ±0.001 mm
Quality Inspection
  • Laser interferometer calibration test
  • Environmental sealing (IP rating) verification test

Manufacturers of Linear Encoder

4 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Dongguan Dafan Optical Technology Co., Ltd.
Guangdong, CN
Listed on the company's own website · profile compiled by CNFX from public sources
Scanner Optics Co., Ltd.
Shenzhen, Guangdong, CN
Also makes: Optical Encoders, Rotary Encoder, Welding Head and 4 more
Listed on the company's own website · profile compiled by CNFX from public sources
Yueqing Yumo Electric Co., Ltd.
Zhejiang, CN
Listed on the company's own website · profile compiled by CNFX from public sources
YUEQING YUMO ELECTRIC CO.,LTD
Zhejiang, CN
Also makes: Check Valve, Diaphragm Valve, Butterfly Valve and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
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Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
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Frequently Asked Questions

What is the typical measuring range of a linear encoder?

According to the directory, the measuring range is typically 50 to 3000 mm, with custom lengths available on request. However, the exact range depends on the specific model and application, so you should confirm with the manufacturer.

What output signals are available?

The directory lists output signals as TTL or HTL, which can be differential or single-ended. The choice depends on the controller interface and cable length. Verify compatibility with your system.

What is the accuracy grade of linear encoders?

The accuracy grade is typically ±0.005 to ±0.02 mm, according to ISO 230-2. This is a reference range; actual accuracy depends on the model and installation. Always check the manufacturer's specifications.

How do I verify the protection class for harsh environments?

The directory lists protection classes from IP54 to IP67 per IEC 60529. Higher IP ratings are available for harsh environments. Confirm the required IP rating with the manufacturer based on your environmental conditions.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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