UNISON TEK CO., LTD.

Introduction

In the world of precision metal machining, high-performance manufacturing is only half the equation. The other half is inspection—the process of verifying that each part meets tight dimensional tolerances, surface finish standards, and geometric requirements.

As industries such as aerospace, medical, automotive, and electronics demand components with micron-level accuracy, the role of precision inspection equipment becomes absolutely critical.

This article introduces the most widely used inspection machines for precision metal parts, including their major brands, accuracy specifications, measurement ranges, and price ranges, helping engineers and decision-makers choose the right tools for their applications.

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1. Coordinate Measuring Machines (CMMs)

Overview

CMMs are among the most popular tools for inspecting precision parts. They use a probe (mechanical, laser, or optical) to measure X, Y, Z coordinates and compare them to the part’s CAD model.

Top Brands

• ZEISS (Germany) – Renowned for accuracy and automation

• Mitutoyo (Japan) – Reliable and widely adopted in Asia

• Hexagon/DEA (Sweden/Italy) – Offers both entry-level and high-end solutions

• Wenzel (Germany) – Known for granite-based structures and long-term stability

Accuracy

• Typical accuracy: ±0.5 to ±2 microns (0.0005–0.002 mm) depending on the model

• Resolution: Often in the sub-micron range (e.g., 0.1 μm)

Measurement Ranges

• Small lab-grade: 300 x 300 x 200 mm

• Large industrial: up to 3000 x 2000 x 1500 mm or more

Price Range

• Entry-level (manual or compact): USD $20,000–$50,000

• Mid-range CNC CMM: USD $60,000–$150,000

• High-end, large or multi-sensor systems: USD $200,000–$500,000+
  
  

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2. Optical Measurement Systems (Vision Systems)

Overview

Used for non-contact inspection of small, delicate, or soft parts. These systems rely on cameras, lasers, or structured light to measure 2D and 3D features.

Top Brands

• Keyence (Japan) – Compact, fast, and easy to use

• Nikon Metrology (Japan) – Offers high-resolution camera-based systems

• OGP (USA) – Multi-sensor systems with advanced automation

• Mitutoyo Quick Vision (Japan) – Combines optical and touch probes

Accuracy

• Typically between ±1 to ±5 microns

• Suitable for surface defects, edge measurements, and tiny features

Measurement Ranges

• Small: 100 x 100 mm

• Medium: 400 x 400 mm

• Some offer scanning and stitching for larger objects

Price Range

• Compact models: USD $10,000–$30,000

• Advanced vision systems: USD $40,000–$100,000
  
  

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3. Surface Roughness Testers (Profilometers)

Overview

Surface roughness testers (profilometers) evaluate the finish quality of machined parts by measuring Ra, Rz, and other surface parameters.

Top Brands

• Mitutoyo SJ Series (Japan) – Portable and accurate

• Taylor Hobson (UK) – High-end lab-grade systems

• Keyence (Japan) – 3D laser profilometers with visualization

• Mahr (Germany) – Wide range of surface metrology tools

Accuracy

• Vertical resolution: 0.001–0.01 µm

• Measurement repeatability: ±0.1–0.3 µm

Measurement Ranges

• Vertical range: up to 800 µm

• Measuring length: 10–100 mm

Price Range

• Portable models: USD $3,000–$10,000

• High-end lab systems: USD $20,000–$60,000
  
  

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4. Height Gauges and Digital Indicators

Overview

Used in workshop environments for quick dimensional checks, especially height, step, and simple geometries.

Top Brands

• Mitutoyo (Japan) – Digimatic height gauges and indicators

• TESA (Switzerland) – High-precision Swiss-made gauges

• Sylvac (Switzerland) – Known for wireless and digital connectivity

• Starrett (USA) – Durable tools for shop-floor use

Accuracy

• ±1 to ±5 microns depending on the model

• Repeatability: within 1–3 microns for high-end models

Measurement Ranges

• Height gauges: 0–300 mm, 0–600 mm, 0–1000 mm

• Indicators: Typically 0–25 mm with resolution down to 0.001 mm

Price Range

• Digital indicators: USD $150–$1,000

• Height gauges: USD $500–$8,000
  
  

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5. Laser Scanners and 3D Scanning Systems

Overview

Laser scanners create detailed 3D models of a part’s surface. Useful for reverse engineering, rapid quality checks, and complex geometries.

Top Brands

• Creaform (Canada) – Handheld laser scanners with fast scanning speeds

• FARO (USA) – Scanners for metrology and large object inspection

• GOM/ZEISS (Germany) – Structured light systems with ultra-high resolution

• Hexagon Absolute Arm – Combines touch and laser scanning

Accuracy

• Varies widely: ±5 to ±30 microns

• High-end scanners can achieve single-digit micron resolution

Measurement Ranges

• Small handheld: 100 mm³ to 1 m³

• Large-area scanners: up to 10 m scanning volume

Price Range

• Entry-level scanners: USD $15,000–$40,000

• Industrial-grade systems: USD $60,000–$200,000+
  
  

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Summary

In the manufacturing of precision metal parts, selecting the right inspection equipment is just as important as choosing the correct machining tool. Whether it's a micron-accurate CMM, a fast optical system, or a surface tester for finish quality, inspection tools ensure product reliability, customer satisfaction, and compliance with standards.

Here’s a quick summary comparison:

Equipment Type	Accuracy	Brands	Price Range	Typical Application
CMM	±0.5–2 µm	ZEISS, Mitutoyo, Hexagon	$20,000–$500,000	Dimensional inspection, GD&T
Optical Vision	±1–5 µm	Keyence, Nikon, OGP	$10,000–$100,000	Small, delicate, non-contact parts
Surface Profilometer	±0.1–0.3 µm	Mitutoyo, Mahr, Hobson	$3,000–$60,000	Surface finish analysis
Height Gauge	±1–5 µm	TESA, Mitutoyo, Sylvac	$500–$8,000	Shop-floor dimensional checks
3D Laser Scanner	±5–30 µm	Creaform, FARO, GOM	$15,000–$200,000	Complex geometry, reverse engineering

As industries move toward smart manufacturing, many of these tools are also becoming more automated, connected, and capable of feeding data directly into digital quality control systems.

In addition, please visit Machined Parts, CNC Turning Parts, Stamping Parts and Technical Data for your reference and Quality Inspection to get more information about us.

Please mail and get a free quote from Harry Yen hyen@unisontek.com.tw  All of us at Unison Tek are looking forward to your good news and invite you to visit our factory in Taiwan.

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