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Av METHODS OF LOCATION, , There are many different methods of locating a work. The locating, arrangement required for a particular work is selected after studying the, type of work, type of operation, degree of accuracy required, number of, , articles to be manufactured and many other factors. The different locating, methods are described below., , Flat locator : The type locators illustrated in Fig.14.5 are employed for, locating flat machined faces of the component. In Fig.14.5(a) the, component is bearing directly on the machined face of the jig body. An, undercut is provided at the bottom for swarf clearance. The flat headed, button type locators, fitted on the Jig body, are illustrated in Fig.14.5(b), and (c). The button type locators are Superior in action than plain flat, , ——— vs Positioning of the button illustrated in (b) is better, ngement than in (c) due to its capacit havin, provision of wart t Pacity to take end load and for having, , learance. The button i he enc, pressure, n in (c) may be bent due to t
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JIGS AND FIXTURES 519, , : The cylindrical locator illustrated in Fig.14.6 is, , jindrical locator, 3 drilled holes. The cylindrical, , for locating components having, , employed ss Aes : :, locator fitted on the jig body is inserted in the drilled hole of the, component to locate it in position. The face of the jig body around the, , locator is undercut to provide space for swarf clearance. When two holes, on the component serve to locate it, one of the button head is flattened to, compensate for any slight inaccuracy in the center distance between the, , two drilled holes in the component., , , , , , , , Uj, \, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , DSISSN_ 4-41, Yi, Wp : Y), ae 146 Cylindrical locator Figure 14.7 Conical locator, -Work, 4. Cylindrical locator. 1. Work, 5. Template, 6. Drill, , bush, 7. Conical locator., , Conical : i, , abl eae : The conical locator illustrated in Fig.14.7 is used for, , 2 pia Pia haying drilled holes. The conical locator is superior to, Ue to its capacity to accommodate a slight variation in the, , hole diamete, T of th I ; 4, location. € component without affecting the accuracy of the, , Jack pin l . ., , 3 locator: The jack pin locator ill in Fi, , ee i d illustrated i, , ri Ae rough workpiece from the bottom ae . employed, , 3 t ' of the pins are adjustable to accommodate the v as ae, , Urface texture of several components, which are rough and ee ae, ichined., , Drill bush locator : The drill bush locator j, , employed for locating cylindrical wore, ee a Fig.14.9 is, opening for locating purpose and is some times aia sh has conical, adjustment of height of the work. The drill bush also eee jig body, Buiding the tool. © purpose of
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520 ELEMENTS OF WORKSHOP TECHNOLOGY, , , , , , , , , , , , , , , , , , , , , , 3. 4 j 5, SS - My, ae, oe, 7, Figure 14.8 Jack pin locator Figure 14.9 Drill bush locator, , 1. Bolt head type, 2. Knurled knob type 3. Jig body, 4. Drill bush locator,, 5. Drill, 6. Work, 7. Drill bush., , Fixed V-locator : The fixed V-locator, illustrated in Fig.14.10 is used to, locate workpieces having circular or semicircular profiles. After setting the, work, the V-block is clamped on the jig body by screws and positioned by, dowels. The V-groove is made slightly tapered for clamping purposes. The, standard included angle of the V-block is 90° degrees., , ch, , , , , , , , qT, i, ', ', 1, , , , Ld, , , , , , , , , , @, ©, , , , , , , , , , , , , , Figure 14.10 Fixed V-locater Figure 14.11 Sliding V-loca, , 1. Work, 2. Fixed V-block. 1, Work, 2. Jig body, 3. Sliding, , V-block, 4. Knurled knob., , Sliding V-location: The Sliding V-locator, illustrated in Fig.14.11, is, used in connection with fixed V-locators for locating workpieces having, circular or semicircular profiles. The work is quickly located by adjusting, the position of the sliding V-block 3 within its body 2, by rotating the ;, knurled knob 4 of the threaded spindle. A circular flange integral with the
