Jigs and there application
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This document discusses different types of jigs and their applications. It begins by defining jigs as production tools used to manufacture duplicate parts accurately. The main types of jigs discussed are drilling jigs, which are used to machine holes. Different types of drilling jigs are described, including template jigs, plate jigs, box jigs, sandwich jigs, diameter jigs, angular jigs, pot jigs, turnover jigs, multi-station jigs, standard jigs, universal jigs, and solid jigs. Jigs are used to reduce costs, increase productivity and accuracy, and enable mass production of interchangeable parts.
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Jigs and there application
- 1. DIFFERENT TYPES OF JIGS AND APPLICATION Submitted by:- Shashank kapoor 154169
- 2. INTRODUCTION • Jig are production work holding devices used to manufacture duplicate parts accurately. • They are special purpose tools used for large scale production by semi skilled operator. • They can also be used for small scale production when interchangeability is important by skilled machinist when the work piece is difficult to hold without special equipment.
- 3. INTRODUCTION They are used in industry:- • To reduce cost of production • To increase productivity • To assure accuracy of component • For mass production of component on its repeatability basis • For fully or partial automation of work • To increase the versatility of the machine tool. • To improve quality with greater machining accuracy
- 4. INTRODUCTION • The term jig should be used only for devices employed while drilling, reaming or tapping holes • It is not fastened to the machined on which it is used. • So it may be moved around on the table of the drilling machine to bring each bushing under the drill • It is not fastened to the drill press table for small w.p, however holes above 0.25 mm inch in diameter are to be drilled, it is usually necessary to fasten the jig to the table securely.
- 5. COMPONENTS To fulfill their basic functions, jigs should possess the following components or elements: 1. A sufficiently rigid body (plate, box or frame structure) into whichthe workpieces are loaded. 2. Locating elements. 3. Clamping elements 4. Tool guiding elements . 5. Elements for positioning or fastening the jig or fixture on the machine on which it is used.
- 6. TYPES OF JIGS DRILLING JIGS Drilling jigs are used to machine holes in mechanical products. To obtain positional accuracy of the holes, hardened drill bushes or jig bushes are used to locate and guide drill, reamers etc., in relation to the work piece.
- 7. TYPES OF DRILLING JIGS 1. Template Jig 2. Plate Type Jig 3. Open Type Jig 4. Swinging Leaf Jig 5. Box Type Jig 6. Channel Type Jig 7. Sandwich Jig 8. Angular Jig 9. Angle Plate Jig 10. Pot Jig 11. Turn-over Jig 12. Diameter Jig 13. Multi-station Jig 14. Standard Jig 15. Universal Jig 16. Trunnion Jig 17. Ring Jig 18. Solid Jig Template jig • Simplest type of drilling jig. • Simply a plate made to the shape and size of the work piece with the required number of holes made in it accurately. Place do the work piece and the holes in the work piece will be made by the drill which will be guided through the holes in the template. • The plate should be hardened to avoid its frequent replacement. This type of jig is suitable if only a few parts are to be made.
- 8. DRILLING JIGS Plate type Jig • This is an improvement over the template type of jig. In place of simple holes, drill bushes are provided in the plate to guide the drill. The workpiece can be clamped to the plate and the holes drilled Open type Jig
- 9. DRILLINGS JIGS Box type Jig • When holes are to be drilled in more than one plane of a workpiece, the jig has to be provided with equivalent number of bush plates. For positioning the jig on the machine table, feet have to be provided opposite each drilling bush plate. • One side of the jig will be provided with a swinging leaf for loading and unloading the workpiece. Such a jig would take the form of a box. • When, one or more sides of the box jig are kept open for loading/unloading, it is known as Tumble type and Trunnion type box jig.
- 10. DRILLING JIGS Sandwich Jig • A sandwich jig is a modification of a plate type of jig. The plate jig has aback- up plate. The job is held between the two plates. The jig is very useful for thin and ductile jobs which might get bent or warped on another type of jig. Diameter Jig • These types of jigs provide asimple means to drill or ream radial holes on a diameter of cylindrical or spherical jobs. The job can be located on a V-block and clamped by a clamping plate and a clamping bolt.
- 11. DRILLING JIGS Angular Jig • This type of jig is used when a hole is to be drilled at an angle to the drilling bush axis, This type of jig is used to drill holes in collars and hubs of pulleys and gears etc. Fig. refers to a drilling jig for drilling oil holes in an I.c. engine connecting rod.
- 12. DRILLING JIGS Pot Jig • This type of jig is used for drilling holes in circular components, which have both internal and external diameters. The body of the jig is in the form of a pot. The workpice is located in the pot of the jig and is properly clamped with the help of a post type locating pin, a clamping plate and a clamping device.
- 13. DRILLING JIGS Turnover Jig • These jigs are used to drill holes in components having no suitable resting surfaces.They are the modification of plate type jigs with jig feet. The jig feet provide the resting surfaces to the jig during drilling. All such jigs should be "turned-over" for loading and unloading the workpiece. Multi-station Jig • This type of jig has a circular indexable plate mounted on a circular3 base plate which is clamped to the machine table with the help of T-bolts and nuts. Such jigs are used on multi- spindle machines. Supposing, the indexable circular plate has four stations. On station 1, drilling operation is being done, on station 2, reaming and on station 3, counter boring operation is being done. Station 4 is used for loading and unloading of the jobs. After every Set of operations, the circular plate is indexed by 90°. Standard Jig • There are many components that are similar in design, but different in dimensions (cylindrical pins of same diameter, but of different lengths or cylindrical pins of different diameters but of same length/different lengths, etc.) It is sometimes possible to drill several of these different components in one jig. The jig incorporates an adjustable end locator to accommodate a variety of lengths. When a jig is especially designed and fabricated for several similar parts, it is called a standard jig.
- 14. DRILLINGS JIGS Turnover Jig • These jigs are used to drill holes in components having no suitable resting surfaces.They are the modification of plate type jigs with jig feet. The jig feet provide the resting surfaces to the jig during drilling. All such jigs should be "turned-over" for loading and unloading the workpiece. Universal jig. • This jig is fIrst manufactured as a basic unit (just like unit heads for machine tools) to which a number of other elements and parts can be fItted to make it suitable for a specifIc job. Since same basic unit can be adopted for different work-pieces and operations, simply by making additions and alterations, hence, named "Universal Jig". Trunnion jigs. • The manual manipulation of heavy duty box type jigs is quite inconvenient and fatiguing. So, such jigs are mounted on trunnions to bring the different faces of the workpiece to the correct locations for drilling the holes. Ring jig. • Such a jig is suitable for drilling holes in round jobs, such as, flanges of pipes. Solid jig. • If holes are to be drilled in workpiece of simple shape and relatively of smaller size, then the jig body can be fabricated from a standard section of rolled steel. Such a jig can be named as a "solid Jig".
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