Plug Gauges And Their Types

 


Plug gauges, also known as pin gauges, are metrology instruments used to measure the inside diameters of holes drilled or moulded into a fabricated portion, piece, or arrangement. They are critical tools for quality control, allowing inspectors, machinists, design teams, and others to quickly determine if a part's attributes fall within the prescribed dimensional tolerance for the internal diameter measurement.

 

This gaging method is intended to enable accurate measurements without using additional, more advanced, and costly measuring instruments such as internal micrometres by production personnel. Plug gauges suppliers ensure that they are useful in manufacturing operations where a large amount of parts is produced because they enable you to determine quality quickly without having to perform individual hole diameter measurements or configure instrumentation.

 

While using plug gauges, it's imperative to remember that the tool just gives you a yes/no answer – it lets the quality control inspector recommend or reject a component. It is merely used for determining whether the diameter is within the tolerance band defined for that specific parameter rather than taking in its actual metrics.

 

Plug Gauge Types

 

Plug gauges come in a variety of types. Here are some of them: 

 

  • Go Plugin gauges. 
  • No-go plug gauges
  • Blend Plug gauges with a go/no-go option 

 

Single-ended gauges, such as go plug gauges and no-go plug gauges, have a handle through which an accurately machined pin or shaft (sometimes referred to as a member) is implanted and is used to check an element of the hole's dimensional tolerances. Single-ended gauges are normally sold in pairs, one with a go plug gauge and the other with a no-go plug gauge.

 

A go-plug gauge is used to measure the hole's minimal dimensional cap (i.e. the hole's diameter's bottom tolerance level), which reflects the highest amount of material left on the component or workpiece. The Plug gauges suppliers must ensure that their Go-plug gauge fits the hole for an approval condition. If the go plug gauge doesn't match the hole in the workpiece, the hole's Dia is too small (inadequate material has been extracted from the workpiece), and the component must be discarded.

 

The aim of a no-go plug gauge, on the other hand, is to verify the hole's highest dimensional cap (the hole's diameter's higher tolerance), which correlates to the minimum permissible amount of material remaining on the component or workpiece. So, a no-go plug gauge must not match the hole for the component to be considered. If the no-go plug gauge didn't fit into the hole, that means the hole's diameter is less than the maximum limit, and the component can be accepted.

 

If, on the other hand, the no-go plug gauge fits into the hole, it means the hole's diameter is too wide (i.e., above the prescribed upper tolerance limit), which implies that Plug Gauges Suppliers have removed too much material during the machining process, and now the component must be discarded.

 

Lastly, the Blend Plug gauge with a go/no-go option is the amalgamation of both variants.

 

Location: Long Gang Lu, Yangxin Xian, Huangshi Shi, Hubei Sheng, China

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