53 Jigs and Fixtures

8/2/2019 53 Jigs and Fixtures

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Jigs and Fixtures

presented by:- Abhilekh Agrawal (31)


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WHAT ARE JIGS AND FIXTURES

Anything used tohold a workpiece ina desired location

Locate parts forprecision

Repeating processon a series of parts

Holding parts formachining, painting,assembly


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WHY ARE THEY IMPORTANT IN MACHINE

DESIGN

Parts should be designed to accommodatestandard fixturing components

Designs should accommodate fast andrepeatable fixturing


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CONTD:--

Both jigs and fixtures position componentsaccurately; and hold components rigid andprevent movement during working in order to

impart greater productivity and part accuracy.


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CONTD:--

Jigs and fixtures hold or grip a work piece inthe predetermined manner of firmness andlocation, to perform on the work piece a

manufacturing operation.


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DEFINITIONS

Jig:A device that holdsthe work and locatesthe path of the tool.

Fixture:A device fixedto the worktable of amachine and locates

the work in an exactposition relative to thecutting tool.

Superior Jig

Flexible Fixturing Systems


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JIGS AND FIXTURES DESIGN

Essential factors:--

Study of the component

Study of the locating elements

Study of the clamping arrangement


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JIGS AND FIXTURES DESIGN

Study of the safety devices

Study of the power devices for operating theclamping arrangement

Study of the tool guiding and cutter settingelements


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JIG AND FIXTUREDESIGN

Jigs

Drill jigs

Drill bushings


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TWO MAINTYPES OF JIGS:

For machining purposes

Locates the component,holds it firmly in place,

and guides the cuttingtool.

For assembly purposes

Locates separate

component parts andholds them rigidly in theircorrect positions whilethey are being connected.

NorthwesternTools


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BASIC CATEGORIES OF JIGS

Clamps

Chucks

Vises Bushings

Modular Fixtures


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DRILL JIG TERMS

Open jig(also called plate jig or drilltemplate)

The simplest type of drill jig

Consists of a plate with holes to guide thedrills, and may have locating pins thatlocate the workpiece on the jig


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DRILL JIG TERMS

Drill bushings

Precision tools that

guide cutting toolssuch as drill andreamers intoprecise locations in

a workpiece.

Accurate Bushing Co.


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Drill Jig Components

Jig body

Cap screws and dowel pins

Locating devices and clamping devices

Locking pins

Drill jig design


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DESIGNING JIGS

Northwestern Tools


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DRILL JIG COMPONENTS

Jig body

Holds the various parts of a jig assembly.

Cap screws and dowel pins

Hold fabricated parts together


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Locating devices

Pins, pads, and recesses used to locatethe workpiece on the jig.


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Clamping devices


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Locking pins

Inserted after thefirst hole is drilled tolock or hold theworkpiece securelyto the jig plate while

subsequent holesare being drilled.


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DIMENSIONING JIG DRAWINGS


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FIXTURES

Milling fixtures

Fixture components

Fixture designconsiderations

Sequence in laying out afixture


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FIXTURE COMPONENTS

Set blocks

Cutter set blocks are mounted on thefixture to properly position the milling cutter

in relation to the workpiece.


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FIXTURE COMPONENTS

Fixture base

Fixture components and the workpiece areusually located on a base, which issecurely fastened to the milling machine

table.

Standard Parts Co.


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FIXTURE COMPONENTS

Clamps

Clamps counteract forces from the feed ofthe table and rotation of the cutter.

American Drill Bushing Co.


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APPLICATION


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CLAMPS


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BUSHINGS


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CHUCKS


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THANK YOU

Documents

53 Jigs and Fixtures