![Page 1: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/1.jpg)
1
Manufacturing Tooling 4. Work Holding
Principles
Nageswara Rao Posinasetti
February 5, 2008 Nageswara Rao Posinasetti 2
Work Holding
Work holder includes all devices that hold, grip, or chuck a work piece to perform a manufacturing operation.
February 5, 2008 Nageswara Rao Posinasetti 3
![Page 2: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/2.jpg)
2
February 5, 2008 Nageswara Rao Posinasetti 4
February 5, 2008 Nageswara Rao Posinasetti 5
February 5, 2008 Nageswara Rao Posinasetti 6
![Page 3: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/3.jpg)
3
February 5, 2008 Nageswara Rao Posinasetti 7
February 5, 2008 Nageswara Rao Posinasetti 8
Purpose & Function of Work Holder
LocationClampingSupport Cutting forcesSafety
February 5, 2008 Nageswara Rao Posinasetti 9
General Considerations
Physical characteristics of the workpiece– Degree of precision– Strength and stiffness of workpiece– Production requirements– Safety requirements
Standard work holders
![Page 4: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/4.jpg)
4
February 5, 2008 Nageswara Rao Posinasetti 10
Locating Principles
Work piece surfaces– Flat surfaces– Cylindrical surfaces– Irregular surfaces
Types of location
February 5, 2008 Nageswara Rao Posinasetti 11
Plane Location
February 5, 2008 Nageswara Rao Posinasetti 12
Concentric Location
![Page 5: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/5.jpg)
5
February 5, 2008 Nageswara Rao Posinasetti 13
Radial Location
February 5, 2008 Nageswara Rao Posinasetti 14
Combined Location
February 5, 2008 Nageswara Rao Posinasetti 15
Degrees of Freedom
![Page 6: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/6.jpg)
6
February 5, 2008 Nageswara Rao Posinasetti 16
3-2-1 Method of Location
February 5, 2008 Nageswara Rao Posinasetti 17
3-2-1 Method of Location
February 5, 2008 Nageswara Rao Posinasetti 18
![Page 7: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/7.jpg)
7
February 5, 2008 Nageswara Rao Posinasetti 19
February 5, 2008 Nageswara Rao Posinasetti 20
Concentric Location
February 5, 2008 Nageswara Rao Posinasetti 21
![Page 8: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/8.jpg)
8
February 5, 2008 Nageswara Rao Posinasetti 22
Basic Locating Rules
Position and Number of LocatorsRedundant LocatorsLocational tolerancesFool proofing
February 5, 2008 Nageswara Rao Posinasetti 23
When more than one locator is placed on a surface, they should be distributed as far apart as possible on the surface
When more than one locator is placed on a surface (plane), they should be distributed as far apart as possible on the surface.This would help in placing the workpiece on locators without much skill.Also the clamping forces would not be able to shift the workpiece from such locators.A blank with irregular surface (such as sand casting) would be better located on such distributed locators.
February 5, 2008 Nageswara Rao Posinasetti 24
When more than one locator is placed on a surface, they should be distributed as
far apart as possible on the surface
Machining forces would not be able to disturb the equilibrium of the workpiece in the fixture with properly distributed locators.Wear of any locator contributes less to the inaccuracy of location if the locators are placed far apart.
![Page 9: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/9.jpg)
9
February 5, 2008 Nageswara Rao Posinasetti 25
While selecting the surface for the largest locators, consideration should be given to the largest area of the workpiece. The two locators should be placed on the surface with the next largest area and the single locator on the surface with the least surface area.
February 5, 2008 Nageswara Rao Posinasetti 26
February 5, 2008 Nageswara Rao Posinasetti 27
![Page 10: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/10.jpg)
10
February 5, 2008 Nageswara Rao Posinasetti 28
Redundant Locator
February 5, 2008 Nageswara Rao Posinasetti 29
To prevent incorrect loading
February 5, 2008 Nageswara Rao Posinasetti 30
To prevent incorrect loading
![Page 11: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/11.jpg)
11
February 5, 2008 Nageswara Rao Posinasetti 31
To prevent incorrect loading
February 5, 2008 Nageswara Rao Posinasetti 32
Basic types of Locators
External locators– Fixed– Adjustable
• Threaded locators• Spring pressure locators• Equalizing locators
Integral locatorsAssembled locators
February 5, 2008 Nageswara Rao Posinasetti 33
Integral locators
![Page 12: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/12.jpg)
12
February 5, 2008 Nageswara Rao Posinasetti 34
Assembled locators
February 5, 2008 Nageswara Rao Posinasetti 35
Basic types of Locators
Locating pinsV-locatorsLocating nestsAdjustable locators
February 5, 2008 Nageswara Rao Posinasetti 36
Locating pins
![Page 13: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/13.jpg)
13
February 5, 2008 Nageswara Rao Posinasetti 37
Locator 0.5 in (Jergens)
February 5, 2008 Nageswara Rao Posinasetti 38
February 5, 2008 Nageswara Rao Posinasetti 39
![Page 14: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/14.jpg)
14
February 5, 2008 Nageswara Rao Posinasetti 40
February 5, 2008 Nageswara Rao Posinasetti 41
February 5, 2008 Nageswara Rao Posinasetti 42
![Page 15: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/15.jpg)
15
February 5, 2008 Nageswara Rao Posinasetti 43
V-locator error?
C"C'
Oα
February 5, 2008 Nageswara Rao Posinasetti 44
V-locator error?
February 5, 2008 Nageswara Rao Posinasetti 45
Adjustable Locators
![Page 16: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/16.jpg)
16
February 5, 2008 Nageswara Rao Posinasetti 46
Support surfaces
Select a surface where there is maximum likelihood for the part to deflect under the action of clamping and cutting forces.Support areas selected should not disturb the location of the workpiece in any manner nor displace the locators while providing the support.Support areas selected should not interfere with the loading and unloading of the component into the work holding fixture.
February 5, 2008 Nageswara Rao Posinasetti 47
February 5, 2008 Nageswara Rao Posinasetti 48
Adjustable Supports
Adjustable locators positioned beneath the workpiece– Threaded– Spring– Equalizers
![Page 17: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/17.jpg)
17
February 5, 2008 Nageswara Rao Posinasetti 49
February 5, 2008 Nageswara Rao Posinasetti 50
February 5, 2008 Nageswara Rao Posinasetti 51
![Page 18: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/18.jpg)
18
February 5, 2008 Nageswara Rao Posinasetti 52
February 5, 2008 Nageswara Rao Posinasetti 53
Internal Locators
Use holes or bored diameters
February 5, 2008 Nageswara Rao Posinasetti 54
![Page 19: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/19.jpg)
19
February 5, 2008 Nageswara Rao Posinasetti 55
February 5, 2008 Nageswara Rao Posinasetti 56
Pin locators
PlainShoulderedUndersized (0.0005 to 0.002”)– Prevent jamming
February 5, 2008 Nageswara Rao Posinasetti 57
![Page 20: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/20.jpg)
20
February 5, 2008 Nageswara Rao Posinasetti 58
February 5, 2008 Nageswara Rao Posinasetti 59
Diamond Pin
Radial location
February 5, 2008 Nageswara Rao Posinasetti 60
![Page 21: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/21.jpg)
21
February 5, 2008 Nageswara Rao Posinasetti 61
February 5, 2008 Nageswara Rao Posinasetti 62
February 5, 2008 Nageswara Rao Posinasetti 63
![Page 22: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/22.jpg)
22
February 5, 2008 Nageswara Rao Posinasetti 64
February 5, 2008 Nageswara Rao Posinasetti 65
Chip and Burr Problems
Make locators easy to clean– Small and hard– Open jigs
Make them self cleaning– Edge relief around locators– wipers
Protect them
February 5, 2008 Nageswara Rao Posinasetti 66
![Page 23: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/23.jpg)
23
February 5, 2008 Nageswara Rao Posinasetti 67
February 5, 2008 Nageswara Rao Posinasetti 68
February 5, 2008 Nageswara Rao Posinasetti 69
![Page 24: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/24.jpg)
24
February 5, 2008 Nageswara Rao Posinasetti 70
http://www.carrlane.com/
February 5, 2008 Nageswara Rao Posinasetti 71
http://www.carrlane.com/
February 5, 2008 Nageswara Rao Posinasetti 72
http://www.carrlane.com/
![Page 25: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/25.jpg)
25
February 5, 2008 Nageswara Rao Posinasetti 73
http://www.carrlane.com/
February 5, 2008 Nageswara Rao Posinasetti 74
http://www.jergensinc.com/
February 5, 2008 Nageswara Rao Posinasetti 75
http://www.jergensinc.com/
![Page 26: Mfg Tooling -05 Work holding-Locatingrao/Mfg Tooling -05 Work holding-Locating.pdf · – Degree of precision ... Degrees of Freedom. 6 February 5, 2008 Nageswara Rao Posinasetti](https://reader034.vdocuments.mx/reader034/viewer/2022042023/5e7ba6110bba855396117f23/html5/thumbnails/26.jpg)
26
February 5, 2008 Nageswara Rao Posinasetti 76
http://www.jergensinc.com/
February 5, 2008 Nageswara Rao Posinasetti 77
http://www.jergensinc.com/
February 5, 2008 Nageswara Rao Posinasetti 78
http://www.jergensinc.com/