types of jig
Post on 02-Nov-2014
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DESCRIPTIONvarious types of jigs used in industries
SEMESTER 5 SUBJECT:DESIGN OF JIGS AND FIXTURE PROFESSOR:DHIRAJ SINGH
INTRODUCTION JIG: A jig is a guiding device, these devices are provided with
attachments for guiding, setting, and supporting the tools in such a manner that all the workpieces produced in a given jig Jigs are used to locate and hold the work that is to be machined A jig can be designed for a particular job The form to be used depends on the shape and requirement of the workpiece to be machined. ADVANTAGES: The employment of unskilled labor is possible when jigs and fixtures can be used in production work. The repetitive layout and setup (which are time-consuming activities and require considerable skill) are eliminated. Also, the use of these devices can result in such a degree of accuracy that workpieces can be assembled with a minimum amount of fitting.
LEAF JIG BOX TYPE JIG CHANNEL JIG OPEN TYPE JIG PLATE TYPE JIG TEMPLATE JIG ANGLE PLATE JIG SANDWICH JIG TRUNNION JIG INDEXING JIG
Leaf jigDEFINATION:The leaf
jig is actually a modification of sandwitch jig,this jig uses a hinge leaf with a camtype latch . Different elements are used in design Material of drill bushs is harder than drill bit It is open type jig Drill bushes are fitted into jig plate Jig plate is hinged to easy loading and unloading with hinge pin
ELEMENTS OF LEAF JIG
TEMPLATE JIGDEFINATION: It is simply a plate made to the shape and size of the work piece; with the require number of holes made it This is the simplest type of jig .It is placed on the work piece and the hole will be made by the drill Which will be guided through the holes in the template plate should be hardened to avoid its frequent replacement This type of jig is suitable if only a few part are to be made.
plate jigs are used to hold parts that are machined at right angles to their mounting locators Pulleys, collars, and gears are some of the parts that use this type of jig A variation is the modified angle-plate jig, which is used for machining angles other than 90 degrees
jigs are a form of rotary jig for very large or oddshaped parts The part is first put into a box-type carrier and then loaded on the trunnion. This jig is well suited for large, heavy parts that must be machined with several separate plate-type jigs.
BOX JIGDEFINATION:When the holes
are to drill more than one plane of the work piece , the jig has to be provided with equalant number of bush plates,such jig is called box jig This jig is box like design and hence it is called box jig For positioning 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 work piece, such a jig would take the form of a box. Such a jig should be as light as possible. Since it will have lifted again and again.
PLATE JIGDEFINATION:. The plate jig are employed to drill holes in large parts, maintaining accurate spacing with each other. The work piece can be clamped to the plate and holes can be drilled. In place of simple holes, drill bushes are provided in the plate to guide the drill. This is an improvement of the
template type of jig. The only difference is that plate jigs have built-in clamps to hold the work. Plate jigs are sometimes made with legs to raise the jig off the table for large work. This style is called a table jig These jigs can also be made with or without bushings, depending on the number of parts to be made.
INDEXING JIG DEFINATION:
Indexing jigs are used to accurately space holes or other machined areas around a part Larger indexing jigs are called rotary jigs. Jig uses either the part itself or a reference plate and a Plunger
SANDWICHDEFINATION: Sandwich jigs
are a form of plate jig with a back Plate This type of jig is ideal for thin or soft parts that could bend or warp in another style of jig. Here again, the use of bushings is determined by the number of parts to be made.
OPEN TYPE JIGDEFINATION:
In this jig the top of the jig is open work piece is placed on the top
CHANNEL JIGDEFINATION:The channel jig
is a simple type of jig having channel like cross section The tool is guided through the drill bush. The component is fitted within the channel is located and clamped by locating the knob. Channel jigs are the simplest form of box jig The work is held between two sides and machined from the third side In some cases, where jig feet are used, the work can be machined on three sides
Presentation on jigs by group: T.E Production
Abhishekh Rane Sushant Mantrawadi