Linear Encoder Scale: Measuring Length Up to 30 m

Component Specifications

Definition

A linear encoder scale is a precision measurement component that provides accurate position feedback along a linear axis. It consists of a graduated scale (typically glass or metal with optical or magnetic markings) and a reading head that detects position changes. In machine bridges and gantries, it enables closed-loop control of linear motion with micron-level accuracy, ensuring precise positioning, repeatability, and synchronization of moving elements.

Working Principle

The linear encoder scale operates by detecting incremental or absolute position changes through optical, magnetic, or inductive sensing. The reading head moves along the scale and interprets markings (grating lines, magnetic poles, or capacitive patterns) to generate electrical signals proportional to displacement. These signals are processed by a controller to determine exact position, velocity, and direction of the machine bridge or gantry axis.

Materials

Scale: Borosilicate glass with chromium grating, stainless steel with magnetic coating, or aluminum with reflective tape. Reading head: Aluminum housing with optical sensors (LED/photodetector), magnetic sensors, or inductive coils. Mounting base: Anodized aluminum or stainless steel.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Accuracy	±1 to ±5 μm/m
Max Speed	Up to 480 m/min
Resolution	0.1 to 5 μm
Signal Output	TTL, HTL, 1Vpp, Sin/Cos, SSI, EnDat, BiSS
Measuring Length	Up to 30 m
Protection Rating	IP67
Operating Temperature	0°C to 50°C

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

Standards

ISO 230-2, DIN 862, ISO 10791-6

Parent Products

This component is used in the following industrial products

Machine Bridge / Gantry

The structural framework that supports and guides the probe head in a Coordinate Measuring Machine (CMM), enabling precise three-dimensional movement.

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Engineering Analysis

Risks & Mitigation

Contamination affecting optical accuracy
Mechanical misalignment causing signal dropout
Electrical interference in signal transmission
Thermal expansion mismatch between scale and machine base

FMEA Triads

Trigger: Oil or coolant contamination on optical scale
Failure: Signal attenuation or complete loss of position feedback
Mitigation: Install protective covers, use magnetic scales in wet environments, implement regular cleaning schedules

Trigger: Mechanical vibration loosening mounting brackets
Failure: Position drift and reduced accuracy
Mitigation: Use vibration-damping mounts, torque-critical fasteners, periodic alignment checks

Trigger: Thermal expansion mismatch between aluminum scale and steel machine base
Failure: Measurement error proportional to temperature change
Mitigation: Use low-expansion materials (Invar, ceramics), implement temperature compensation in controller, allow thermal stabilization period

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Positioning accuracy: ±3 μm/300 mm per ISO 230-2; Repeatability: ±1 μm

Test Method

Laser interferometer measurement per ISO 230-2, environmental testing per IEC 60068-2

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Linear Encoder Scale

Manufacturer profiles associated with Linear Encoder Scale.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between incremental and absolute linear encoder scales?

Incremental encoders measure relative position from a reference point and require homing after power loss. Absolute encoders provide unique position values immediately upon power-up without homing, using coded tracks on the scale.

How do I choose between optical and magnetic linear encoder scales?

Optical scales offer higher resolution and accuracy (±1 μm) but are sensitive to contamination. Magnetic scales are more robust against dust, coolant, and vibration with slightly lower accuracy (±5 μm), suitable for harsh environments.

What maintenance is required for linear encoder scales?

Regular cleaning of scale surfaces with isopropyl alcohol, checking mounting alignment, and verifying signal integrity. Optical scales require protection from oil and chips; magnetic scales need periodic demagnetization checks.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Linear Encoder Scale