Clamping Tools: The vice is the most common tool used for clamping or holding work. Following are the various types of vices used for different purposes. Pin vice: The Pin vice is used for holding small diameter jobs. Pipe vice: A pipe vice is used for the holding round section of metal, tubes and pipes. Angle Plate: It is made up of cast iron in different sizes.
It has two planed surfaces at right angles to each other and has various slots in each surface to hold the work by means of bolts and clamps, Never do hammering on the angle plate to fasten tighten the nuts and bolts. Jig: A jig is a device that does both functions like holding the work and guiding a tool. Fixture: Fixtures are used to securely locate position in a specific location or orientation and support the work , ensuring that all parts produced using the fixture will maintain conformity and interchangeability.
Start Learning. Jig Fixture Template Lathe. Explanation: Jigs and fixtures are production tools used to accurately manufacture duplicate and interchangeable parts. Jigs A jig is a special device which holds, supports, locates and also guides the cutting tool during operation Jigs are designed to accommodate one or more components at a time Jigs are available for drilling or boring Fixtures A fixture is a production tool that locates and holds the work-piece It does not guide the cutting tools, but the tools can be positioned before cutting with the help of setting blocks and feeler gauges etc Fixtures of different types are made for milling, turning, grinding, welding, bending etc Purpose of Jigs and Fixture: To reduce the cost of production, as their use eliminates the laying out of work marking, punching, positioning, alignments etc.
Answer Detailed Solution Below Option 2 : guide the tool. Explanation: Jigs and fixtures are the auxiliary devices used in mass production. Get Started for Free Download App. Answer Detailed Solution Below Option 1 : locating and guiding the drill. Explanation: Jig bushes Jig bushes are used in jigs for guiding tools like drills, reamers, boring bars, and counter bring tools.
Jig bushes are mainly used to fulfil the following requirements. To allow easy entry of the tool. For easy entry, jig bushes are provided with a chamfer at the top. Bushes must be easily replaceable. For easy fitting and removal, the outer surfaces of the bushes are slightly tapered. Depending upon the number of operations to be performed, one or more bushes are used on different faces of a jig.
The bush plate is generally made of mild steel or cast iron , into which hardened bushes are fitted to guide the tools. These drilling jigs are used to machine holes in the mechanical products in order to obtain positional accuracy. Additional Information Template Jig: Simply a plate made to the shape and size of the workpiece with the required number of holes made in it accurately 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. Solid jig: If holes are to be drilled in a workpiece of simple shape and relatively of smaller size, then the jig body can be fabricated from a standard section of rolled steel.
Answer Detailed Solution Below Option 3 : 9. Concept: Principle : There are 12 degree of freedom of a work piece i.
By providing three pins in the base, five degree of freedom will be arrested i. These three pins also ensure that machining always takes place on single plane perpendicular to the base, along the length direction. By providing two pins at front side, this arrests movement of work piece along negative Y-direction in clockwise and anti-clock wise rotation about Z-axis.
A sixth pin is provided on a plane perpendicular to the previous two planes, which also arrests movement about negative X-axis. By providing six pins, nine degree of freedom is arrested. Hence we can see that this principle helps us in locating the devices.
Open type jig Box type jig Plate type jig Template jig. Types of drill jigs: Open Closed Open jigs are used when the operation is to be done only on one side of the piece. Closed jigs Box jig are used when the operations are to be done on more than one side of the piece. Jigs are identified according to the way they are built.
The component is located and clamped at one position but drilling can be done from different directions as required. When a box jig contains bushings on two or more sides for drilling from different directions, it is called a tumble jig. This jig is meant for small components only.
The body of the jig is in the form of a pot. The workpiece is located in the pot of the jig and is properly clamped with the help of a post type locating pins, a clamping plate, and a clamping device. Strap clamp Cam clamp Toggle clamp Equaliser. Explanation: Clamping: The function of clamping is to ensure that the part remains stable during the cutting process. It should hold the work-piece against the locator and keep it stable against all the disturbing forces that work on it during the cutting process.
Basic types of clamps: Strap clamp: By far this clamp is the simplest clamp used in jigs and fixtures. It is based upon the lever principles to amplify the clamping force required. By tightening the stud the clamping force is transferred to the part.
Heel pin is the fulcrum about which the lever acts, while the clamping force is applied at the stud by tightening the screw. The actual force is transmitted to the part at the end of the strap as indicated in the figure. Cam clamp: They are popular as quick action clamps. They shift their mating faces. There is a risk of cam clamp getting loose due to vibrations.
Toggle clamp: These clamps are commercially available in various designs. It is a quick-acting mechanical linkage. They can be withdrawn by a considerable distance for loading and unloading of the work-piece. They are vulnerable to work-piece variations therefore they are provided with an adjustable clamping screw.
Equaliser: It is a method of compensating variation in two work-piece by pivoting the clamp around a pin. They can be extended to clamp more than two work-pieces. Answer Detailed Solution Below Option 3 : only setting time. Jigs A jig is a special device which holds, supports, locates and also guides the cutting tool during operation Jigs are designed to accommodate one or more components at a time Jigs are available for drilling or boring Fixtures A fixture is a production tool that locates and holds the work-piece It does not guide the cutting tools, but the tools can be positioned before cutting with the help of setting blocks and feeler gauges etc and reduces setting time.
Fixtures of different types are made for milling, turning, grinding, welding, bending etc Purpose of Jigs and Fixture: To reduce the cost of production, as their use eliminates the laying out of work marking, punching, positioning, alignments etc.
To increase the production. To assure high accuracy of the parts. Increase in interchangeability. Reduce quality control expenses. Answer Detailed Solution Below Option 1 : holes of accurate centre-to-centre distance are required. Difficulty Beginner Intermediate Advanced. Explore Documents. Angular Post Jig. Uploaded by Aswin Kumar. Did you find this document useful? Is this content inappropriate?
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