Inspection fixtures, also known as checking fixtures or gauges, are specialized tools used in manufacturing and quality control processes to verify the dimensional accuracy, alignment, and functionality of parts and components. These fixtures are typically custom-designed and manufactured to match the specific geometry and features of the parts being inspected.

Here are some key features and functions of inspection fixtures:

1. Precise replication of part geometry: Inspection fixtures are designed to accurately replicate the geometry and features of the parts being inspected. This ensures that the parts are held in the correct position and orientation during inspection, allowing for accurate measurements and evaluations.

2. Mounting and clamping: Inspection fixtures include mechanisms for securely mounting and clamping the parts in place during inspection. This helps to prevent movement or shifting of the parts, which could affect the accuracy of the measurements.

3. Datum features: Inspection fixtures often include datum features or reference surfaces that serve as a point of alignment for the part being inspected. These datum features ensure consistent positioning and orientation of the part within the fixture, allowing for repeatable and reliable measurements.

4. Measurement and inspection points: Inspection fixtures may include built-in measurement tools, such as probes, sensors, or indicators, for assessing specific dimensions, tolerances, or characteristics of the part. These measurement points are strategically located to provide access to critical features of the part for inspection.

5. Customization and adaptability: Inspection fixtures are custom-designed to match the specific requirements of the parts being inspected. They can be tailored to accommodate complex part geometries, multiple inspection points, and specific measurement techniques. Additionally, inspection fixtures are often designed with modular components or adjustable features to accommodate variations in part dimensions or designs.

6. Durability and repeatability: Inspection fixtures are constructed from high-quality materials, such as aluminum, steel, or composite materials, to ensure durability and long-term reliability. They are built to withstand repeated use in manufacturing environments and maintain their accuracy and functionality over time.

Overall, inspection fixtures play a critical role in ensuring the quality and consistency of manufactured parts by providing a standardized and controlled environment for accurate dimensional inspection and evaluation.