Gauges
Gauges are precision inspection tools used to check the dimensions of finished products without measuring them directly. They help determine whether the component is within specified limits and tolerances. Gauges are widely used in mass production industries for quick and accurate inspection.
Importance of Gauges
- Ensure accuracy and quality of finished products.
- Reduce inspection time.
- Maintain interchangeability of components.
- Detect manufacturing defects quickly.
Types of Gauges Commonly Used in Gauging Finished Products
Several types of gauges are used to inspect finished products depending on the dimension being checked.
Plug Gauge
Plug gauges are used to check the internal diameter of holes. They usually have two ends known as Go and No-Go ends.
Ring Gauge
Ring gauges are used to check the external diameter of cylindrical parts such as shafts.
Snap Gauge
Snap gauges are used to quickly check external dimensions of parts without removing them from the machine.
Feeler Gauge
Feeler gauges measure small gaps or clearances between two surfaces.
Thread Gauge
Thread gauges are used to check the accuracy of screw threads.
Method of Selective Assembly
Selective assembly is a method used in manufacturing where components are grouped according to their dimensions and then assembled with matching parts. This helps achieve proper fit even when slight dimensional variations exist.
Advantages of Selective Assembly
- Improves accuracy of assembly.
- Reduces rejection of components.
- Ensures better performance of assembled products.
‘Go’ System of Gauges
The Go and No-Go gauge system is commonly used for inspection of manufactured components.
Go Gauge
The Go gauge checks the maximum material limit of a part. It should pass easily through the component if the dimension is correct.
No-Go Gauge
The No-Go gauge checks the minimum material limit. It should not pass through the component.
This system quickly determines whether a component is acceptable or rejected.
Hole Basis System of Standardization
The hole basis system is a method used in the standardization of limits and fits. In this system, the size of the hole is kept constant while the shaft size is varied to obtain different types of fits.
Advantages
- Easy manufacturing of holes using standard tools.
- Wide availability of standard drills and reamers.
- Simplifies production processes.
Application
- Machine tool assemblies.
- Precision engineering components.
- Mass production industries.
Conclusion
Gauges are essential tools used for inspection and quality control of finished products. Methods such as selective assembly and the Go/No-Go gauge system help maintain accuracy and interchangeability in manufacturing. The hole basis system of standardization further simplifies production and ensures proper fitting of machine components.