Instead of measuring actual dimensions, the conformance of product with tolerance specifications can be checked by a ‘GO’ and ‘NOT GO’ gauges. It has an advantage that it can be operated by unskilled persons. The method of measurement adopted for mass production of parts is called the system of limit gauging. There are several methods available to determine the dimensions of components in a system of limits and fits. A ring gauge consists of a piece of metal in which a hole of the required size is based as shown in the figure. Ring gauges are limit gauges for gauging the shafts and are used in a similar manner to that of GO and NOGO plug gages. GO and NOGO plain plug gauges for sizes up to 10 mm. Types of Plain Plug Gauges in Normal Practice areġ. The plain plug gauges are designated by ‘GO’ and ‘NOGO’ as applicable. The plain plug gauges are the double-ended type for sizes up to 63 mm and of single-ended types of sizes above 63 mm. The gauging surface of plain plug gauges are hardened to not less than 750 H.V and suitably stabilized and groud and lapped. These plain plug gauges are made of proper wear-resisting steel and the handles are made of any suitable steel, such as light metal handles always for heavy plain plug gauges or suitable non-metallic handles are provided for smaller plain plug gauges.
Plain plug gauges are used for checking plain or unthreaded holes and shafts.
Read also: Mechanical Measurements: Definitions and Terms Applicable to Measurements Types of Gaugesįollowing are the different types of gauges used in every industries They are used for determining whether the inspected parts are made within the specified limits. Gauges do not indicate the exact value of the inspected dimension on the work. The gauges are firm design inspection tools, without a scale, which serve to check the dimensions of manufactured parts.
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