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What is the difference between a jig and a fixture?

Release time:2018-08-16

The most basic difference, as all answers here stated, is that a jig is a type of tool used to hold and support the workpiece but in addition to this, Jig also control the location or motion of tool. On the other hand, a fixture is a support or work holding device used to hold work in place. It never guide the tool. 
That’s the difference. Jigs guide the tools (in simple words, jigs instruct tools that where to go) but fixture never guide the tool. Below images may clear this further.

Figure 1. Shows Jigs.

In figure 1 (above), U shaped body is Jig because as we can see, it has holes in upper portion which will guide the boring bar so that it can do boring operation in workpiece.

Figure 2. Shows Fixture.

Figure 2 is nearly same as figure 1 but one basic difference is in upper part of U shaped body. You can see there is no holes in this image and so this U shaped body can not guide the boring bar. Here, it will just hold and will support the workpiece.

So, in figure 2, U shaped body is fixture while in figure 1, U shaped body is jig.

One another example in figure 3. 
 Left is jig as it has hole to guide tool, while right one is fixture as it is just holding the workpiece.

Now, some more differences are:

  • Jigs are light in weight as compared with the fixtures.
  • The cost of jigs is higher when it is compared with the fixtures.
  • Jigs are not fitted to the machine table but fixtures are fitted.

References: Images from Google

Difference Between Jig and Fixture

Difference Between Jigs and Fixtures

What is the difference between Jigs and Fixtures

 
 
Roopak Rawat
Roopak Rawat, Tool maker by profession.
Originally Answered: What is jig and fixtures?
Jigs and Fixtures are :-
# Mechanical devices.
# Locates and holds the workpieces while machining.
# Only used for production.
# Provides repeatability in work.
# Reduces work setting time & operators fatigue.

​Fixtures​



Difference between Jigs and Fixtures:-
# jigs guides the tool but fixtures only locate the tool.
# jigs are used in unidimensional machining i.e. drilling,reaming,tapping, etc but fixtures are used in multidimensional machining i.e. milling,turning,grinding,etc .
# jigs are light weight but fixtures are rigid and bulky.


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