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Jigs and Fixtures-Definition, Types, Differences, Factors to be considered in designing ,Advantages, Application, Material used

Jigs and Fixtures:

Are you looking for the Jigs and Fixtures? So today we will study in details the Definition, Types, Differences between, Advantages and Disadvantages, Application of Jigs and Fixtures. Here you will get the articles of Mechanical Engineering in brief with some key points and you will get to know an enormous amount of knowledge from It. So If you find this articles helpful, please let us know in the comment box, either if any correction required too, also let us know in the comment box.

Jigs and Fixtures Definition:

Jigs:

  • This is a work holding device which holds, supports and locates the workpiece and guides the one or more tools to perform a specific operation. In other words, this can also be defined as,
  • Used for holding the tools and also guiding the workpiece.
  • The main purpose of a jig is, to provide repeatability, accuracy, and interchangeability in the manufacturing of products.
  • It is used in the uni-dimensional machining like drilling, tapping, and reaming etc.
  • This system is found to be light and has a complex shape.
  • Gauge blocks are not necessary and the cost of jigs is higher.
  • Jigs are not fixed to the machine table until a large operation has to be performed.

Jigs and fixtures

Fixtures:

  • Fixtures are the work holding device, which holds, supports and locates the workpiece but not guides the cutting tool to perform a specific operation.
  • In other words, the fixtures are only the work holding device that holds, supports and locates the workpiece in the desired position to perform any operation.
  • The main purpose of the fixtures is, to hold and locate the workpiece during any machining operation and to provide repeatability, accuracy, and interchangeability in the manufacturing of products.
  • Used in multi-dimensional machining like milling, grinding, turning etc.
  • This system found to be heavy in weight, have simple designing.
  • Gauge blocks provided for effective handling and the cost is average.
  • Having specific tools which use particularly in the milling machine, shapers and slotting machine.
  • Fixtures are fixed to the machine table.

Conclusion:

  • Both the jigs and the fixtures are used to reduce the nonproductive time of any mass production process.
  • The principle of location or the 3-2-1 principle, CAD tools (like ProE), and FEA tools (like ANSYS) are used for the design of the jigs as well as the fixtures.
  • The jig is used for guiding the cutting tool (like a drill bit), and for doing so, jigs have components like a bush, which comes in contact with the cutting tool.
  • On the other hand, a fixture never comes into direct contact with the cutting tool.
  • Fixtures assure the position and alignment of the workpieces for getting the required machining operation done.

Factors to be considered in designing:

  • Study of component
  • Study of locating elements
  • Type and capacity of the machine
  • Loading and unloading arrangement
  • Clamping arrangement
  • Study of power devices for operating and clamping element and also safety arrangement device
  • The clearance between a jig and the component
  • Study of tool guiding, cutter setting elements, rigidity and vibration problems
  • Fool-proofing arrangement
  • Study of ejecting devices, table fixing arrangement and the indexing device
  • Swarf removal arrangement

Types of Jigs and Fixtures:

The type of jig and fixture totally depends on the type of work to be machined and its quality required. Some simple drill jigs are as below:

  • Template jig 
  • Plate jig 
  • Diameter jig 
  • Channel jig 
  • Ring jig 
  • Box jig 
  • Leaf jig
  • Angle plate jig
  • Indexing jig
  • Trunion jig

And The different types of fixtures are:

  • Plate fixture
  • Angle plate fixture
  • Vise-jaw fixture
  • Indexing fixture
  • Multistation fixture
  • Profile fixture

Difference between  Jigs and Fixtures:

The differences are listed below:

Sl.No Jigs Fixtures
1. It holds and locates the work as well as guides the tool. It holds and locates the work but does not guide the tool.
2. These are lighter in construction and clamping with the table is often unnecessary. These are heavier in construction and bolted rigidly on the machine table.
3. Used for holding the work and guiding the tool in drilling, reaming or tapping operation. Used for holding the work in milling, grinding, turning or planning operation.
4. Gauge blocks are not necessary. Gauge blocks may be provided for effective handling
5 The cost is more. The cost is less as compared with the jigs.
6. Their designing is complex. Their designing is simple as compared to jigs.

Advantages, Application, and Material used for jigs and fixtures:

Advantages of jigs and fixtures:

  • It eliminates the setting time required before machining.
  • It increases the machining accuracy and also increases production capacity.
  • Requires less skilled operation.
  • They reduce the production cost.
  • Increases the machine and labor utilization.
  • They simplify the work handling.
  • Increases the quality of production in the industry.
  • They enable the quick setting of a tool and proper positioning of the work.

Application of jigs and fixtures:

  • Mass production of automobile parts.
  • Inspection of parts in continuous production in manufacturing industries.
  • Cutting the ingots in the steel plant.
  • In the refrigeration industry.
  • Pump assembling process
  • For drilling the flanges and drilling holes to any required angles.
  • For multi-spindle machining.
  • Jigs used for mass drilling, reaming and tapping.
  • For guiding the tools for machining contours.
  • Fixtures used for milling, mass turning, and grinding operations.

Material used for jigs and fixtures:

Today we have learned in details about Definition, Types, Differences between them, Advantages and Disadvantages, Application, Material used for Jigs and Fixtures. If I have missed something, kindly inform me through commenting. If you like this article, don’t forget to share it on social networks. Subscribe our website for more informative articles. Thanks for reading it. Thank you.

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4 Replies to “Jigs and Fixtures-Definition, Types, Differences, Factors to be considered in designing ,Advantages, Application, Material used

  1. It is very nice and Important Information for a machanical engineer and FITTER thanks so much about this information

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