Main Parts Of Jig and Fixture - Jig and Fixture Design

Main Parts  Of Jig and Fixture - Jig and Fixture Design

i. Jig body
ii. Jig feet
iii. Jig bushing
iv. Jig plate or bush plate
v. Locators
vi. Clamps
vii. Fool proof element

Parts Of Jig And Fixture
Parts Of Jig And Fixture
i. Jig body
The jig body supports the work piece and has locating and clamping elements in it. It is provided with four jig feets and rests on the machine table.

ii. Jig feet
a jig feet which is not bolted to machine table is provided with four jig feet, instead of the entire bottom surface lying flat on the machine table. Jig feet are either cast with the jig body or detachable or welded to the base. They are usually hardened and ground to have flat bottom.

iii. Jig bushing
For guiding drills, reamers and boring bars, hardened steel jig bushes are employed which are fixed in the jig plates. The bushes can be replaced when wornout with less cost than replacing the entire jig plate.

iv. Jig plate or bush plate
Usually the jig plate carries the jig bush for guiding the tools. The jig plate may be rigidly constructed as a single unit of jig or it may be of leaf or latch type. In this type, the jig plate must be clamped with the jig frame.

v. Locators
Locators help a work piece to ret in proper position in a jig. Depending on the type of work piece, various types of locators are used for the locating the components, in the jig with reference to the tools, the locators are usually detachable type, fixed to the jig frame. So whenever wear occurs, the locators can be easily replaced with new ones.

vi. Clamps
Clamps are used for holding the work piece rigidly against all disturbing forces. They also keep the work piece firmly in contact with locating pins of surfaces. Sufficient thickness of section should be provided to withstand clamping forces.

vii. Fool proof element
This element prevents the work from being loaded wrongly into the jig. The elements may be simple fouling pegs, cross pieces or pins.

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