Code disk: Diameter 20-100 mm, Thickness 1-5 mm

Q: What is the difference between incremental and absolute code disks?

Incremental disks have uniform patterns that generate pulses for relative position tracking, while absolute disks have unique binary or Gray code patterns that provide exact position information even after power loss.

Q: How do I select the right resolution for my application?

Calculate based on required positional accuracy and maximum speed. Higher resolution provides finer control but may require faster electronics. Typical industrial applications use 500-2,000 PPR.

Q: Can code disks be replaced independently?

Yes, but replacement requires precise alignment and calibration. Use manufacturer-specified disks to maintain encoder accuracy and compatibility.

Component Specifications

Definition

A code disk is a critical component in rotary encoders that features precisely patterned tracks of alternating transparent/opaque segments (optical) or magnetic poles (magnetic). As the disk rotates with the encoder shaft, these patterns interrupt light beams or alter magnetic fields, generating electrical pulses that are processed to determine precise angular position, speed, and direction of rotation in industrial machinery.

Working Principle

The code disk operates on either optical or magnetic principles. In optical encoders, a light source passes through transparent segments and is blocked by opaque segments, creating light/dark patterns detected by photodetectors. In magnetic encoders, Hall-effect sensors detect changes in magnetic fields from alternating poles. The resulting pulse trains are decoded by electronic circuits to calculate position with resolutions determined by the number of segments per revolution.

Materials

Optical disks: Glass (borosilicate) or polymer (polycarbonate) substrates with chromium or photoresist patterning. Magnetic disks: Ferromagnetic alloys (nickel-iron) or rare-earth magnets (neodymium) with precise pole magnetization. Mounting hubs typically use aluminum or stainless steel.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Max RPM	5,000-10,000
Accuracy	±0.1° to ±0.001°
Diameter	20-100 mm
Thickness	1-5 mm
Resolution	100-10,000 pulses per revolution
Output Type	Incremental/Absolute
Protection Rating	IP54-IP67
Operating Temperature	-20°C to +85°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 16016, DIN 40080, IEC 60068

Parent Products

This component is used in the following industrial products

Encoder

A device that converts mechanical motion into electrical signals to measure position, speed, or direction in servo/stepper motor systems.

View Product Details

Encoder/Resolver

A sensor that converts mechanical motion into electrical signals for position, speed, or direction feedback in control systems.

View Product Details

Feedback Device (Encoder/Resolver)

A precision sensor that provides real-time position, speed, and direction feedback to servo motor control systems.

View Product Details

Engineering Analysis

Risks & Mitigation

Contamination affecting optical transmission
Mechanical damage from shock/vibration
Magnetic interference
Thermal expansion causing accuracy drift
Installation misalignment

FMEA Triads

Trigger: Dust accumulation on optical patterns
Failure: Signal dropout or erroneous readings
Mitigation: Implement sealed encoder housings with IP67 rating and regular maintenance cleaning

Trigger: Bearing wear in encoder assembly
Failure: Eccentric rotation causing inconsistent pulse generation
Mitigation: Use precision bearings with periodic lubrication and vibration monitoring

Trigger: Temperature extremes beyond specification
Failure: Material expansion/contraction altering pattern spacing
Mitigation: Select materials with low thermal expansion coefficients and implement temperature compensation algorithms

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Radial runout < 0.02 mm, axial runout < 0.01 mm, segment position accuracy ±0.5 arc-minutes

Test Method

Laser interferometry for pattern accuracy, coordinate measuring machines for dimensional verification, environmental testing per IEC 60068 standards

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 Code disk

Manufacturer profiles associated with Code disk.

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Related Components

Upper Tool (Punch)

Upper Tool (Punch) is the active forming component in metal plate bending machines that applies precise downward force to create bends in sheet metal.

Main Frame

The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.

Shaft Bearing

Precision component supporting rotating shafts in vibration motors to reduce friction and maintain alignment.

Seal Groove

Precision-machined groove in aluminum bearing housings designed to accommodate sealing elements for fluid containment and contamination prevention.

Frequently Asked Questions

What is the difference between incremental and absolute code disks?

Incremental disks have uniform patterns that generate pulses for relative position tracking, while absolute disks have unique binary or Gray code patterns that provide exact position information even after power loss.

How do I select the right resolution for my application?

Calculate based on required positional accuracy and maximum speed. Higher resolution provides finer control but may require faster electronics. Typical industrial applications use 500-2,000 PPR.

Can code disks be replaced independently?

Yes, but replacement requires precise alignment and calibration. Use manufacturer-specified disks to maintain encoder accuracy and compatibility.

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.

Code disk

Component Specifications

Parent Products

Encoder

Encoder/Resolver

Feedback Device (Encoder/Resolver)

Engineering Analysis

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Procurement Evaluation Criteria

Manufacturers of Code disk

Related Components

Frequently Asked Questions

What is the difference between incremental and absolute code disks?

How do I select the right resolution for my application?

Can code disks be replaced independently?

Data Basis

Request Manufacturing Insight for Code disk