Jig and Fixture Design, 5E (Delmar Learning Drafting) by Edward Hoffman

By Edward Hoffman

Via emphasizing similarities between kinds and kinds, Jig and Fixture layout, 5E speeds readers to a whole realizing of the why's and how's of designing and construction numerous diversified workholders for production. From uncomplicated template and plate-type jigs to advanced channel and box-type tooling, this newly revised version good points greater than 500 illustrations of instruments and functions to spur readers to luck. All-new sections on meeting instruments, dealing with instruments, and catalog studying permit readers to enhance vital abilities. particular examples of assorted jigs and commercially to be had furniture additionally seem to advisor readers in constructing their realizing of ways layout ideas, in addition to the newest layout and production applied sciences, are being utilized within the development of jigs and furnishings this present day. As in prior variants, heavy emphasis is put on the economics of jigs and furniture, together with equipment and formulation to be used in estimating workholder bills. an exceptional historical past in business tactics, in addition to computer store expertise, is believed.

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Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s). Editorial review has deemed that any suppressed content does not materially affect the overall learning experience. Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it. 20 SECTION I Basic Types and Functions of Jigs and Fixtures B. Figure 2–26. 500-inchdiameter holes. 1. Plate jig 2. Angle-plate jig 3. Channel jig D. Figure 2–28.

They must also make the tool foolproof. Little is gained if the parts take too long to load or unload, or if they are incorrectly put into the tool. The tool designer must also provide rigid support for the part. If the part locators are designed properly, they can serve as supports as well as locators. Positioning the Locators Whenever possible, locators should contact the work on a machined surface. This permits accurate placement of the part in the tool and ensures the repeatability of the jig or fixture.

To increase the overall locational efficiency, a great number of locator designs have been examined. However, there is only one style that will not bind in any locating hole. This is the spherical locator. A spherical locator greatly reduces the contact area by removing all the material not directly in contact with the workpiece. Spherical locators are impossible to bind because, unlike with cylindrical locators, the distance between the opposite sides of the contact area is always the same. As shown in Figure 3–24A, if a part is loaded on a cylindrical pin, it can and will bind unless the centerline of the hole is precisely aligned with the centerline of the locator.

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