Gauges
Introduction
A gauge is a measuring or inspection tool used to check the dimensions of components without directly measuring them with a scale. Gauges are widely used in engineering workshops and manufacturing industries to ensure that parts are produced within specified limits and tolerances.
Necessity of Gauges
- To check whether the dimensions of a part are within specified limits.
- To ensure interchangeability of machine components.
- To increase production accuracy and quality.
- To simplify inspection during mass production.
- To reduce measuring time.
Types of Gauges
Gauges are classified into different types depending on their function and application.
- Limit Gauges
- Feeler Gauges
- Screw Pitch Gauges
- Radius Gauges
- Wire Gauges
Limit Gauges
Limit gauges are used to check whether a component falls within the specified dimensional limits. These gauges follow the principle of “Go” and “No-Go”.
- Go Gauge: Should pass through the part.
- No-Go Gauge: Should not pass through the part.
Ring Gauge
A ring gauge is used to check the external diameter of cylindrical components such as shafts. It is a circular gauge with a precisely machined internal diameter.
Uses
- Checking the diameter of shafts.
- Ensuring accuracy of external cylindrical parts.
Snap Gauge
A snap gauge is used to measure the external dimensions of workpieces quickly. It consists of fixed and adjustable jaws that allow the operator to check dimensions without removing the workpiece.
Uses
- Checking shaft diameters.
- Inspection in mass production.
Plug Gauge
A plug gauge is used to check the internal diameter of holes. It is usually double-ended with a Go and No-Go end.
Uses
- Checking hole sizes.
- Ensuring accurate internal dimensions.
Other Types of Gauges
Feeler Gauge
A feeler gauge consists of a set of thin metal blades of different thicknesses used to measure small gaps or clearances between two surfaces.
Uses
- Measuring small clearances.
- Checking valve gaps in engines.
- Inspection of machine parts.
Screw Pitch Gauge
A screw pitch gauge is used to measure the pitch of screw threads. It consists of several blades with teeth corresponding to different thread pitches.
Uses
- Checking thread pitch.
- Identifying thread standards.
Radius Gauge
A radius gauge is used to check the radius of curved surfaces. It consists of several blades with different concave and convex radii.
Uses
- Measuring internal and external radii.
- Checking curved surfaces.
Wire Gauge
A wire gauge is used to measure the thickness or diameter of wires and thin sheets. It contains slots of different sizes corresponding to different gauge numbers.
Uses
- Measuring wire diameter.
- Checking sheet thickness.
- Identifying wire gauge numbers.
Conclusion
Gauges are essential inspection tools used in mechanical workshops and manufacturing industries. They help maintain accuracy, ensure quality control, and speed up the inspection process. Different types of gauges such as limit gauges, feeler gauges, screw pitch gauges, radius gauges, and wire gauges are used depending on the measurement requirements.