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Industrial Engineering ONLINE Course
Jig and Fixture Design is part of Process Industrial Engineering and Human Effort Industrial Engineering.
Jig and Fixture Design is part of Process Industrial Engineering and Human Effort Industrial Engineering.
Jigs and Fixtures improve productivity of process, equipment and operators.
Basic Principles of Jig and Fixture Design
1. Reduction of handling time: Method of location and clamping should be such as to reduce handling time to minimum.
2. Rigidity: The jigs and fixtures have to be rigid. Cast iron which absorbs shocks more readily is recommended as body material.
3. Clearance between Jig walls and component: There should be good amount of clearance between component and body of jig to provide for variations in the dimensions of the component. Clearance is also required for chips to come out.
4. Swarf Clearance: There has to be clearance for swarf. Cored holes are provided for this purpose in bigger jigs.
5. Locating and supporting surfaces wherever possible be removable and be of hardened material.
6. Easy loading and unloading: The process of loading and unloading the component should be as easy as possible. In case of heavy components, it should be possible to slide the component into the fixture.
7. Clamping: Clamping should always be arranged directly above the points supporting the work.
8. Fool proofing: Incorporate arrangements that ensure that jig closes only when the component is inserted correctly.
9. Design for safety: Do not leave any sharp edges in the jig body.
10. Component should be ejected when the jig cover is opened.
11. Spring Locations: The number of locations on any rough component should never exceed three in any one plane.
12. Jig Base: A jig which is not bolted to machine table must be provided with four legs.
13. Accuracy and Variations: Jig design must permit only acceptable variation in the dimensions of the finished component.
14. Jig bushes: Jig bushes fixed in jig plates are used to guide drills, reamers and boring bars. They can be replaced when worn.
Locating and Principles of Location
A work piece in space which is free to move in any direction can move in 12 directions. To restrict the movement of the work piece completely it has to be restricted in all its 12 directions. Restricting the movement of the work piece in all its degrees of freedom or in some degrees of freedom is done by location in a jig or fixture.
Principles of Location
1..3:2:1 Method of location: A work piece can be positively located by means of six pins so positioned that collectively they restrict the work piece in nine of its degrees of freedom. 3 pins are in one plane, 2 in a plane perpendicular to it and one in a plan perpendicular as well as adjacent to both of the planes.
2. Points more than necessary should not be used in any plane.
3. Principle of extreme position of locating points.
4. The principle of mutually perpendicular planes.
5. Location for accuracy
6. Small locating surfaces
7. Replacement facilitation
8. Swarf clearance
1. Jacks and supporting pins
2. Cylindrical locators or locating pins.
3. Conical locators
4. Diamond pin locators
5. Vee locators
Basic Principles of Jig and Fixture Design
1. Reduction of handling time: Method of location and clamping should be such as to reduce handling time to minimum.
2. Rigidity: The jigs and fixtures have to be rigid. Cast iron which absorbs shocks more readily is recommended as body material.
3. Clearance between Jig walls and component: There should be good amount of clearance between component and body of jig to provide for variations in the dimensions of the component. Clearance is also required for chips to come out.
4. Swarf Clearance: There has to be clearance for swarf. Cored holes are provided for this purpose in bigger jigs.
5. Locating and supporting surfaces wherever possible be removable and be of hardened material.
6. Easy loading and unloading: The process of loading and unloading the component should be as easy as possible. In case of heavy components, it should be possible to slide the component into the fixture.
7. Clamping: Clamping should always be arranged directly above the points supporting the work.
8. Fool proofing: Incorporate arrangements that ensure that jig closes only when the component is inserted correctly.
9. Design for safety: Do not leave any sharp edges in the jig body.
10. Component should be ejected when the jig cover is opened.
11. Spring Locations: The number of locations on any rough component should never exceed three in any one plane.
12. Jig Base: A jig which is not bolted to machine table must be provided with four legs.
13. Accuracy and Variations: Jig design must permit only acceptable variation in the dimensions of the finished component.
14. Jig bushes: Jig bushes fixed in jig plates are used to guide drills, reamers and boring bars. They can be replaced when worn.
Locating and Principles of Location
A work piece in space which is free to move in any direction can move in 12 directions. To restrict the movement of the work piece completely it has to be restricted in all its 12 directions. Restricting the movement of the work piece in all its degrees of freedom or in some degrees of freedom is done by location in a jig or fixture.
Principles of Location
1..3:2:1 Method of location: A work piece can be positively located by means of six pins so positioned that collectively they restrict the work piece in nine of its degrees of freedom. 3 pins are in one plane, 2 in a plane perpendicular to it and one in a plan perpendicular as well as adjacent to both of the planes.
2. Points more than necessary should not be used in any plane.
3. Principle of extreme position of locating points.
4. The principle of mutually perpendicular planes.
5. Location for accuracy
6. Small locating surfaces
7. Replacement facilitation
8. Swarf clearance
Locating Devices
1. Jacks and supporting pins
2. Cylindrical locators or locating pins.
3. Conical locators
4. Diamond pin locators
5. Vee locators
Locating Pins Part. 1
Locating Pins Pt. 2: Types of Locating
MISUMI USA
Locating Pins Pt. 3: Types of Mounting
MISUMI USA
Clamping Devices
1. Strap clamps
2. Screw Clamps
3. Hinged Clamps
4. C-Clamps
5. Wedge Clamps
6. Quick acting nut
7. Toggle Clamps
8. Quick acting cam operated Clamps
Workpiece Fixture & Design Principles - Interesting content - to read in more details
https://www.carrlane.com/en-us/engineering-resources/fixture-design-principles
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Jig and Fixture Design & Manufacturing Engineering Services.
Precision and Efficiency: Enhance Your Manufacturing Process with Custom Jigs and Fixtures
2023
DEC 13, 2023
Jig & Fixture Design Principles for CNC Turning
Tackling Jig and Fixture Design Dilemmas Using FEM simulation.
2020 Collection
Fixture Design Criteria - PowerPoint PPT Presentation
Dr. Shivkumar Raman
Oklahoma State University
https://www.slideserve.com/tiger-gonzales/fixture-design-criteria
Some articles on BIW welding fixtures
https://biwweldingfixture.blogspot.com/
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As on 27.10.2018
Jig and Fixture Design, 1920 book by Franklin Day Jones
Archive.org link http://archive.org/details/jigfixturedesign00joneuoft
Tool Engineering - Jigs and Fixtures - 1922 - Alfred Dowd
http://archive.org/details/toolengineeringj024704mbp
Jig and Fixture Design Manual
Erik K. Henriksen
1973
http://ia700806.us.archive.org/25/items/JigAndFixtureDesignManual/Hendriksen-JigAndFixtureDesignManual.pdf
IGNOU Course material http://www.ignou.ac.in/upload/jig.pdf
Jig & Fixture Design - Edward G, Hoffman, 2004
Google Book Link -
http://books.google.co.in/books/about/Jig_and_Fixture_Design.html?id=6UFhomTE8KYC
Jig and Fixture Design
Edward Hoffman
5 Edition
Cengage Learning, 01-Aug-2012 - 416 pages
https://books.google.co.in/books?id=KTIKAAAAQBAJ
Design of Milling Fixture and Drilling Jig
25 July 2020
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https://www.youtube.com/watch?v=N3IGbBiILHg
https://twitter.com/Saurabh58484533
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Jigs and Fixtures of Machine Shop
NPTEL Lecture 33
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Lecture material for Lecture 33
http://nptel.iitm.ac.in/courses/Webcourse-contents/IIT%20Kharagpur/Manuf%20Proc%20II/pdf/LM-33.pdf
Design and Appliocation of Jigs and Fixtures -Lec 34 NPTEL
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Course material for nPTEL 34 Lecture
http://nptel.iitm.ac.in/courses/Webcourse-contents/IIT%20Kharagpur/Manuf%20Proc%20II/pdf/LM-34.pdf
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More Videos
https://www.youtube.com/watch?v=vOo2MCYPsm4
https://www.youtube.com/watch?v=CMrLFpXJsGA
Case Studies
http://eprints2.utem.edu.my/3116/ Press Rivet Clutch
Weld Fixture Design Lessons
http://www.weldfixturedesign101.com/
Related Videos on Weld Fixture Design
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Hindi English Combined Lecture
Sarvesh Srivastava
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Online Free Access Handbook of Industrial Engineering includes all modules of IE Online Course Notes.
Updated on 29.8.2024, 26.3.2022, 16 August 2020, 7 July 2020
27 October 2018, 15 August 2013
Industrial inspection and quality control rely on precision measuring machines and precision fixturing alike. Reliable and repeatable fixture set-up is a basic requirement for successful and accurate measurement. Therefore fixturing is as important a part of proper quality control as the choice of a suitable CMM, form measuring machine or vision measurement system.
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