Slip Gauges

Slip Gauges

Slip gauges, also known as gauge blocks, are precision measuring tools used as length standards in engineering measurement. They are used to obtain accurate measurements by building up a desired length through a combination of gauge blocks.

Necessity of Using Slip Gauges

• Provide highly accurate measurement standards.
• Used for calibration of measuring instruments.
• Ensure precision in manufacturing processes.
• Help in checking machine tool accuracy.
• Used in inspection and quality control.

Classification of Slip Gauges

Slip gauges are classified according to their accuracy and application.

• Grade 0: Used for inspection work in precision laboratories.
• Grade 1: Used in tool rooms for precise measurements.
• Grade 2: Used in workshops for general inspection work.
• Calibration Grade (K): Used as reference standards.

Accuracy of Slip Gauges

Slip gauges are manufactured with extremely high accuracy and surface finish. The faces of the gauge blocks are lapped to achieve perfect flatness so that they can stick together when wrung.

Set of Slip Gauge Blocks

Slip gauges are supplied in sets consisting of blocks of different sizes. These blocks can be combined to produce a wide range of dimensions.

English Set

English slip gauge sets are based on inch measurements.

Metric Set

Metric slip gauge sets are based on millimeter measurements and are commonly used in modern engineering practice.

Metric Slip Gauge Sets

46 Piece Set

This set contains 46 gauge blocks of different sizes used for general measurement work.

103 Piece Set

The 103-piece set contains additional gauge blocks allowing more precise combinations for measurement.

112 Piece Set

The 112-piece set provides the highest flexibility for building a wide range of dimensions with great accuracy.

Details of Slip Gauges

• Made from high-grade alloy steel or carbide.
• Highly polished and accurately lapped surfaces.
• Rectangular shape with parallel measuring faces.
• Marked with precise length values.

Wringing of Slip Gauges

Wringing is the process of sliding two slip gauges together so that they adhere to each other due to molecular attraction and surface tension. This allows several blocks to be combined to obtain a desired dimension.

Steps in Wringing

1. Clean the surfaces of the slip gauges.
2. Place one block over the other at a slight angle.
3. Slide and rotate the block until they stick together.
4. Ensure the surfaces are properly aligned.

Building Up of Slip Gauges

Building up means combining several slip gauge blocks to obtain a required measurement size.

Example: To obtain a dimension of 25.32 mm, suitable gauge blocks such as 20 mm, 5 mm, 0.3 mm, and 0.02 mm may be combined.

Care and Maintenance of Slip Gauges

• Handle slip gauges carefully to avoid scratches.
• Keep the blocks clean and dry.
• Apply a thin layer of oil after use to prevent rust.
• Store them in a protective case.
• Avoid dropping or mishandling the blocks.
• Check calibration periodically.

Conclusion

Slip gauges are extremely accurate measuring tools used as standards in engineering measurements. Their ability to be wrung together allows the creation of precise dimensions for calibration and inspection work. Proper handling, maintenance, and storage are essential to maintain their accuracy and longevity.