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Precision Gear and Spline Inspection Services

Ensure optimal performance and longevity with Carnes-Miller Gear's comprehensive inspection services for precision gears and splines. Utilizing advanced measurement technology and 50+ years of expertise, we verify dimensional accuracy, surface finish quality, and compliance with AGMA standards. Our meticulous inspection processes detect manufacturing defects, heat treat distortion, and wear patterns before they compromise your critical machinery.

Precision measurement equipment inspecting gear teeth with digital calipers

Our Precision Inspection Services

Comprehensive quality assurance for gears and splines across all manufacturing stages and applications.

Spur Gear Inspection

Complete dimensional verification for shaped and hobbed spur gears up to 20 inches diameter, ensuring AGMA 10-13 compliance with profile, pitch, and runout measurements.

Helical Gear Inspection

Specialized inspection for helical gears up to 8 inches diameter, verifying helix angles, lead accuracy, profile modifications, and surface finish to AGMA Class 10-13 standards.

Spline Inspection

Precision measurement of internal and external involute and straight-sided splines, including pitch diameter, tooth thickness, form diameter, and proper fit verification.

Worm Gear Inspection

Detailed inspection of worm wheels and worms, verifying throat diameter, lead accuracy, surface finish, and proper mating engagement for smooth operation.

Heat Treat Distortion Analysis

In-house nital-etch testing and dimensional verification to identify grinding burns, heat treat distortion, and salvageability of out-of-spec gears.

Reverse Engineering Inspection

Complete dimensional documentation and analysis of sample gears or splines to create manufacturing specifications when OEM data is unavailable.

Engineer reviewing detailed gear inspection report with measurement data

Our 5-Step Precision Inspection Process

Initial Assessment and Documentation Review

We begin by reviewing your specifications, drawings, and quality requirements. Our team evaluates the gear or spline type, applicable AGMA standards, and critical dimensions to establish a comprehensive inspection plan tailored to your application's performance demands.

Dimensional Measurement and Data Collection

Surface Quality and Metallurgical Analysis

Verification Against Specifications

Detailed Reporting and Recommendations

Trusted by Leading Manufacturers

Proven Quality Assurance

50+ years of delivering precision inspection services to aerospace, defense, medical, and industrial sectors.

"Carnes-Miller's spur gear manufacturing is exceptional. AGMA 13 ground gears deliver smooth, quiet operation our equipment demands. Reliability and precision every single time."

James Hartwell

"We had obsolete worm gear equipment failing monthly. CMG's reverse engineering service replicated the exact worm wheels and worms perfectly. Problem solved, downtime eliminated."

Maria Rodriguez

"For aerospace applications, gear and spline inspection is non-negotiable. CMG's AGMA 13 ratings and nital-etch testing give us the confidence we need for mission-critical components."

Robert Chen

"Emergency helical gear replacement needed within 48 hours. CMG delivered turn-key gears machined to specification ahead of schedule. Their responsiveness is unmatched in the industry."

Patricia Vance

"Over 50 years of expertise translating to competitive pricing without sacrificing quality. CMG's in-house gear grinding to 400mm diameter provides exceptional value for our OEM manufacturing needs."

David Thompson

"Partner with CMG for 15 years. Their splines manufacturing—internal and external—remains flawless. Consistency, expertise, professionalism: the foundation of our relationship."

Susan Mitchell

"Their planetary gears manufacturing capabilities—ring gears to 10-inch pitch diameter—enabled our compact transmission redesign. Technical expertise solved what competitors said was impossible."

Michael Torres

"CMG's gear and spline inspection protocols ensure our agricultural equipment meets industry standards consistently. Their market positioning as precision leaders is well-deserved and competitive."

Kevin Walsh

"Carnes-Miller's spur gear manufacturing is exceptional. AGMA 13 ground gears deliver smooth, quiet operation our equipment demands. Reliability and precision every single time."

James Hartwell

"We had obsolete worm gear equipment failing monthly. CMG's reverse engineering service replicated the exact worm wheels and worms perfectly. Problem solved, downtime eliminated."

Maria Rodriguez

"For aerospace applications, gear and spline inspection is non-negotiable. CMG's AGMA 13 ratings and nital-etch testing give us the confidence we need for mission-critical components."

Robert Chen

"Emergency helical gear replacement needed within 48 hours. CMG delivered turn-key gears machined to specification ahead of schedule. Their responsiveness is unmatched in the industry."

Patricia Vance

"Over 50 years of expertise translating to competitive pricing without sacrificing quality. CMG's in-house gear grinding to 400mm diameter provides exceptional value for our OEM manufacturing needs."

David Thompson

"Partner with CMG for 15 years. Their splines manufacturing—internal and external—remains flawless. Consistency, expertise, professionalism: the foundation of our relationship."

Susan Mitchell

"Their planetary gears manufacturing capabilities—ring gears to 10-inch pitch diameter—enabled our compact transmission redesign. Technical expertise solved what competitors said was impossible."

Michael Torres

"CMG's gear and spline inspection protocols ensure our agricultural equipment meets industry standards consistently. Their market positioning as precision leaders is well-deserved and competitive."

Kevin Walsh

"Carnes-Miller's spur gear manufacturing is exceptional. AGMA 13 ground gears deliver smooth, quiet operation our equipment demands. Reliability and precision every single time."

James Hartwell

"We had obsolete worm gear equipment failing monthly. CMG's reverse engineering service replicated the exact worm wheels and worms perfectly. Problem solved, downtime eliminated."

Maria Rodriguez

"For aerospace applications, gear and spline inspection is non-negotiable. CMG's AGMA 13 ratings and nital-etch testing give us the confidence we need for mission-critical components."

Robert Chen

"Emergency helical gear replacement needed within 48 hours. CMG delivered turn-key gears machined to specification ahead of schedule. Their responsiveness is unmatched in the industry."

Patricia Vance

"Over 50 years of expertise translating to competitive pricing without sacrificing quality. CMG's in-house gear grinding to 400mm diameter provides exceptional value for our OEM manufacturing needs."

David Thompson

"Partner with CMG for 15 years. Their splines manufacturing—internal and external—remains flawless. Consistency, expertise, professionalism: the foundation of our relationship."

Susan Mitchell

"Their planetary gears manufacturing capabilities—ring gears to 10-inch pitch diameter—enabled our compact transmission redesign. Technical expertise solved what competitors said was impossible."

Michael Torres

"CMG's gear and spline inspection protocols ensure our agricultural equipment meets industry standards consistently. Their market positioning as precision leaders is well-deserved and competitive."

Kevin Walsh
The CMG Quality Difference

Why Choose Carnes-Miller Gear for Inspection?

Half a century of precision measurement expertise you can trust.

50+ Years Expertise

Since 1973, we've refined inspection methodologies across diverse industries including aerospace, defense, and medical sectors.

Advanced Measurement Capability

State-of-the-art equipment and calibrated tooling ensure AGMA Class 10-13 verification with complete dimensional traceability and accuracy.

In-House Testing

Comprehensive capabilities including nital-etch testing for grinding burns and metallurgical analysis, all within our 18,000-square-foot facility.

Detailed Documentation

Comprehensive reports with gear charts, measurement data, and clear recommendations that provide complete transparency and compliance verification.

The Carnes-Miller Gear Team

Expert precision manufacturing professionals since 1973

Since 1973, Carnes-Miller Gear has built a reputation on precision, reliability, and deep technical expertise in gear manufacturing and inspection. Founded during a pivotal era in American manufacturing, CMG has weathered economic storms—from the energy crisis of the 1970s through Covid-19—by staying committed to quality and customer satisfaction. Our team brings decades of specialized knowledge in gear tooling, equipment, nomenclature, and tolerancing, serving critical sectors including aerospace, defense, and medical industries. Operating from our dedicated 18,000-square-foot facility in Locust, NC, we've evolved from a gear shaping and hobbing specialist into a full-service precision manufacturing partner. Our inspection services reflect this heritage: meticulous attention to detail, comprehensive in-house capabilities, and an unwavering commitment to helping customers achieve optimal gear performance and reliability.

AGMA 13Maximum quality class rating capability
50+ YearsOf precision gear manufacturing expertise
18,000 sq ftDedicated inspection and manufacturing facility

Frequently Asked Questions

What is the process of gear inspection?

Gear inspection involves systematic dimensional measurement and verification of gear teeth, including tooth profile, pitch diameter, runout, concentricity, and surface finish. Using calibrated precision equipment, inspectors measure these parameters and compare them against specifications and AGMA quality standards. The process includes visual examination, dimensional gauging, surface quality analysis, and often metallurgical testing like nital-etch for heat treat verification. Comprehensive reports document all findings and verify compliance with specified tolerances.

What is a spline on a gear?

What AGMA quality classes can Carnes-Miller Gear inspect?

How much does gear and spline inspection cost?

What size gears and splines can you inspect?

Can you inspect gears that have failed or are out of specification?

Do you provide inspection for reverse-engineered gears?

What documentation do you provide with inspection services?

Need Expert Gear Inspection Guidance?

Our precision measurement specialists are ready to discuss your inspection requirements and quality assurance needs.

Quality & Precision Certified

Awards and Recognition

AGMA standards compliance certification badge

AGMA Standards Compliance

Verified capability for Class 10-13 inspection

50 years in business excellence badge

50+ Years Excellence

Five decades of precision manufacturing leadership

Calibrated equipment certification badge

Calibrated Equipment

Traceable precision measurement instruments

Get Your Precision Gear and Spline Inspection Quote Today

Submit your specifications and inspection requirements for a detailed quote. Our team will review your needs and provide a comprehensive proposal with turnaround time and pricing.

Contact Us Today

For immediate assistance, feel free to give us a direct call at +1 704-888-4448 You can also send us a quick email at dan@cmgear.us