Tuesday, 21 March 2017

Jigs and Fixture : Working, advantages and Differences

Today we will discuss about what are Jigs and Fixture, working, advantages and also difference between them. Before discussing about it first you should learn the concept of Jigs and Fixtures. We know that machining is the process of removing metal by the moving or stationary work piece by use of tool. This process is done on some kind of machining like lathe, milling, drilling etc. When the work piece is smaller and simpler it can be easily mounted on the machine and we do not require any other mechanism to hold the work piece (concept of Fixture) and guide the tool (concept of Jigs).  But in some cases when the work piece is heavier and machining process is difficult some external mechanisms are used to hold the work piece on machine and also guide the tool so accurate machining can be done on work piece. These devices are known as jigs and fixture.  

Jigs and Fixtures are production tools used to accurately manufacturing duplicate and interchangeable parts. They are specially designed so that a large number of components can be machined or assembled identically, and to ensure interchangeability of components. They eliminate the necessity of a special set up for each individual part.

  • Jigs and fixtures are precision tools.
  • They are expensive to produce because they are made to fine limits from materials with good resistance to wear.
  • They must be properly stored or isolated to prevent accident damage, and they must be numbered for identification for future use.

Jigs and Fixtures:

What is Jig?

A jig is a device in which a component is held and located for a specific operation  in such a way that it will guide one or more cutting tools to the same zone of machining. The usual machining operation for jigs are drilling and reaming. Jigs are usually fitted with hardened steel bushings for guiding drills or cutting tools. The most common jigs are drilling jigs, reaming jigs, assembly jigs etc. when these are used they are usually not fastened to machine tools or table but are free to be moved so as to permit the proper registering of the work and the tool.
 
Jigs and Fixture : Working, advantages and Differences
Jig

What is Fixture?

A fixture is a production tool that locates, holds and supports the work securely in a fixed orientation with respect to the tool so that the required machining operations can be performed. Fixtures vary in design from relatively simple tools to expensive complicated devices. There are most frequently attached to some machine tool or table. The most common fixture are milling fixtures, broaching fixtures, assembly fixture etc.
Jigs and Fixture : Working, advantages and Differences
Fixture

 Advantages of Jigs and Fixtures:

Jigs and fixtures are used in mass production of identical parts. They gives following advantages.
  • They improve productivity.
  • It gives rapid production work.
  • It reduced manufacturing costs.
  • Complex and heavy components can be easily machined.
  • Owing to high clamping rigidity, higher speed, feeds and depth of cut can be used.
  • Jigs and fixtures are increased machining accuracy.
  • It reduces in the expenditure due to inspection and quality control of finished components.


Difference between Jigs and Fixture:

Jigs and Fixture : Working, advantages and Differences

S.No.

Jigs

Fixtures

1.
Jigs incorporate bushes that guide the tools.
Fixture holds the component being machined with the cutters working independently.
2.
Jigs are used on drilling, reaming, tapping and counter boring operations.
They are used in connection with turning, milling, grinding, shaping, planning, and boring operation.
3.
Jigs are depended on operation.
Fixtures are dependent on specific machine tools.
4.
They are lighter than fixture.
Fixture are heavier in construction and bolted rigidly  on the machine table.
5.
They are more costly compare to fixture.
They are less costly.
6.
They are not fixed on machine table.
They are fixed on machine table.



This is all about Jigs and Fixtures uses, advantages and difference between them. If you have any query regarding this article, ask by commenting. If you like this article, don’t forget to share it on social networks.

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