INDUSTRY COMPONENT

Pitch Line

The imaginary reference line along a rack's teeth where pitch is measured, crucial for proper gear engagement and motion transfer.

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Component Specifications

Definition
The pitch line is a theoretical line along the length of a rack's teeth where the tooth thickness equals the space width, defining the reference for pitch measurement. It represents the ideal contact path for mating with a pinion gear, ensuring smooth linear motion conversion from rotational input. In rack-and-pinion systems, this line determines the effective radius for calculating linear displacement per pinion revolution.
Working Principle
The pitch line serves as the reference datum for tooth geometry, ensuring consistent spacing (pitch) between teeth. When a pinion gear engages with the rack, its pitch circle rolls along the rack's pitch line without slipping, converting rotational motion into precise linear motion. This line defines the neutral axis where no sliding occurs during proper meshing, minimizing wear and maintaining accuracy in positioning systems.
Materials
Typically matches the rack material: carbon steel (AISI 1045, 4140), alloy steel, stainless steel (304, 316), or engineered plastics (nylon, acetal) for specific applications. Surface treatments include carburizing, induction hardening (50-60 HRC), nitriding, or zinc plating for corrosion resistance.
Technical Parameters
  • Pitch π × Module
  • Module 1-10 mm
  • Tooth Height 2.25 × Module
  • Accuracy Grade DIN 5-9, AGMA 10-14
  • Pressure Angle 20° or 14.5°
  • Surface Finish Ra 0.8-3.2 μm
Standards
ISO 53, ISO 54, DIN 867, AGMA 2015

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Pitch Line.

rack pitch line linear motion component gear engagement reference rack-and-pinion system industrial transmission DIN 867 ISO 53 Pitch Line Pitch Line in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Rack

A linear gear component with teeth cut along its length that meshes with a pinion gear to convert rotational motion into linear motion.

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Engineering Analysis

Risks & Mitigation
  • Inaccurate pitch line causing gear misalignment
  • Wear altering pitch line geometry
  • Thermal expansion affecting pitch consistency
  • Improper lubrication leading to pitch line degradation
FMEA Triads
Trigger: Manufacturing tolerances exceeding standards
Failure: Increased backlash and positioning errors
Mitigation: Implement statistical process control (SPC) during machining, use coordinate measuring machines (CMM) for verification
Trigger: Abrasive wear from contaminated environment
Failure: Pitch line geometry distortion causing erratic motion
Mitigation: Install protective covers, use filtration systems for lubricants, apply wear-resistant coatings

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.02 mm per 300 mm length for precision grades
Test Method
Laser interferometry for pitch accuracy, profile projection for tooth geometry, hardness testing per ISO 6508

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

Why is pitch line accuracy critical in rack systems?

Pitch line accuracy ensures proper gear meshing, minimizes backlash, reduces vibration/noise, and maintains positioning precision in linear motion applications.

How does pitch line relate to module in metric systems?

Pitch = π × Module. The module defines tooth size, while the pitch line provides the reference for spacing these teeth consistently along the rack.

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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