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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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DRILL JIG COMPONENTS
Locating devices
Pins, pads, and recesses used to locatethe workpiece on the jig.
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DRILL JIG COMPONENTS
Clamping devices
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DRILL JIG COMPONENTS
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