How To Distinguish: The Difference Between Fixtures, Jigs And Inspection Tools

The difference between fixtures, jigs and inspection tools:

Fixtures

During the machining process, in order to ensure the machining accuracy of the workpiece, the workpiece is positioned relative to the machine tool and the tool, and is fastened so that it can be processed or inspected. For example: three-jaw chuck

The fixture materials are mostly steel, aluminum, etc., and generally need to position and fix the workpiece at the same time.

Jigs

The Jig is a tool that helps control position or movement (or both) , also known as a “mold” or “tool.” Its main purpose is to repeatedly and accurately reproduce a part. For example: a panel separation jig, a welding jig, a screw driving jig, etc.

The materials of the jig are mostly bakelite, epoxy board, synthetic stone, etc. Generally, it is only necessary to position the workpiece and there is no need to fix the workpiece.

Inspection tools

They are the tools used in industrial production to detect the dimensional data of workpieces in order to control their processing accuracy during production. For example: micrometer, caliper, thread gauge, special inspection tools, etc.

Classification of fixtures: general fixtures, special fixtures, assembly fixtures, general adjustable fixtures

(1) Universal fixtures:

These are generally standardized and highly versatile. They can be used to clamp different workpieces with minimal or no adjustment. They can be used to process different workpieces within a certain range . For example, a three-jaw chuck or flat-nose pliers on a lathe.

(2) Special fixture

A fixture designed specifically for the processing of a certain process of a certain workpiece . It has the advantages of compact structure, quick operation, and easy use. It is suitable for production with fixed products and large batches.

(3) Assembly fixture

A special fixture is assembled using standardized and serialized fixture components according to the assembly method of a special fixture according to the processing requirements of a certain process of a certain workpiece . The use of assembly fixtures greatly shortens the design and production cycle of special fixtures. Moreover, when the product is modified, most of the original fixture components can be removed and reused, which is suitable for high-variety and small-batch production.

(4) Universal adjustable fixture

A special fixture formed by replacing individual positioning elements/clamping elements . This fixture can be used for different workpieces, the processing object is uncertain, and the general range is large. It is suitable for multi-variety and small batch production.

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