Jigs And Fixtures
-
Upload
zubair-hassan -
Category
Documents
-
view
157 -
download
2
Transcript of Jigs And Fixtures
![Page 1: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/1.jpg)
![Page 2: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/2.jpg)
PRESENTED BY
Zubair Hassan Rno 11
Mechanical Engineering Department
![Page 3: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/3.jpg)
WHAT IS MECHANICAL ASSEMBLY ?
![Page 4: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/4.jpg)
JIGS AND FIXTURES
![Page 5: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/5.jpg)
INTRODUCTION
Jigs and fixtures are production tools
Used to accurately manufacture duplicate and interchangeable parts.
When large numbers of components can be machined or assembled identically
![Page 6: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/6.jpg)
JIGS Device that holds, supports, or is placed
on a part to be machined.
locates and holds the work piece
Guides the cutting tool
For repeatability and exact duplication of a part for reproduction
![Page 7: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/7.jpg)
JIGS
![Page 8: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/8.jpg)
JIGSA jig is usually made of metal which locates and holds the work-piece(s) in a positive manner and also guides the cutting tools
![Page 9: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/9.jpg)
ANIMATION
![Page 10: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/10.jpg)
FIXTURES Strong and rigid mechanical devices which
attaches to a machine For quick and consistently accurate
locating, supporting and clamping, blanks against cutting tools
Much-wider scope of application than jigs Common fixtures include milling fixtures,
lathe fixtures, sawing fixtures, and grinding fixtures
![Page 11: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/11.jpg)
FIXTURESSimple Fixture
![Page 12: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/12.jpg)
ANIMATION
![Page 13: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/13.jpg)
JIGS AND FIXTURE MATERIAL
Materials used in Jigs and fixtures are made from a variety of materials, some of which can be hardened to resist wear.
Given below are the materials often used in jigs, fixtures, press tools etc. Some common materials are as following: Hardened Steel. Carbide. Bronze. Stainless Steel.
![Page 14: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/14.jpg)
TYPES OF JIGS Jigs may be divided into two general classes:
Boring jigs and Drill jigs
Boring jigs are used to bore holes that either is too large to drill or must be made an odd size.
Drill jigs are used to drill , ream, tap, chamfer, and counter bore, countersink and reverse.
Basic jig is almost the same for either machining operation. The only difference is in the size of the bushings used
![Page 15: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/15.jpg)
TEMPLATE JIGS Template jigs are normally used for accuracy rather than
speed.
This type of jig fits over, on, or into the work and is not usually clamped
Least expensive and simplest type of jig to use
When bushings are not used, the whole jig plate is normally hardened
![Page 16: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/16.jpg)
PLATE JIGS Similar to templates, The only difference is that plate jigs have built-in clamps to hold the work.
Made with or without bushings, depending on the number of parts to be made
![Page 17: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/17.jpg)
TABLE JIG Plate jigs are sometimes made with legs to raise
the jig off the table for large work. This style is called a table jig.
![Page 18: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/18.jpg)
SANDWICH JIGS Sandwich jigs are a form of plate jig with a back
plate, This type of jig is ideal for thin or soft parts that could bend or warp in another style of jig.
![Page 19: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/19.jpg)
BOX JIGS
Box jigs, or tumble jigs, usually totally surround the part. This style of jig allows the part to be completely machined on every surface without the need to reposition the work in the jig.
![Page 20: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/20.jpg)
CHANNEL JIGS Channel jigs are the simplest form of box jig. The work is
held between two sides and machined from the third side. In some cases, where jig feet are used, the work can be machined on three sides.
![Page 21: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/21.jpg)
TYPES OF FIXTURES
These work holders are designed for applications where the cutting tools cannot be guided as easily as a drill. With fixtures, an edge finder, center finder, or gage blocks position the cutter
![Page 22: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/22.jpg)
PLATE FIXTURES Plate fixtures are the simplest form of fixture. The basic
fixture is made from a flat plate that has a variety of clamps and locators to hold and locate the part. The simplicity of this fixture makes it useful for most machining operations
![Page 23: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/23.jpg)
ANGLE PLATE FIXTURES The angle-plate fixture is a variation of the plate fixture.
With this tool, the part is normally machined at a right angle to its locator.
![Page 24: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/24.jpg)
MODIFIED ANGLE PLATE FIXTURES
While most angle-plate fixtures are made at 90 degrees, there are times when other angles are needed. In these cases, a modified angle-plate fixture can be used
![Page 25: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/25.jpg)
INDEXING FIXTURES Indexing fixtures are very similar to indexing jigs. These
fixtures are used for machining parts that must have machined details evenly spaced
![Page 26: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/26.jpg)
PROFILING FIXTURES
Profiling fixtures are used to guide tools for machining contours that the machine cannot normally follow
![Page 27: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/27.jpg)
ADVANTAGES OF JIGS AND FIXTURES
Increased Productivity Skill Reduction High accuracy obtained Safety of work Easy to operate Cost Reduction
![Page 28: Jigs And Fixtures](https://reader033.fdocuments.in/reader033/viewer/2022061522/587e058a1a28abe11a8b5acf/html5/thumbnails/28.jpg)