Jigs and Fixtures MCQ Quiz - Objective Question with Answer for Jigs and Fixtures - Download Free PDF

Explanation:

• Jigs and fixtures are production tools used to accurately manufacture duplicate and interchangeable parts.
• Jigs and fixtures are specially designed so that large numbers of components can be machined or assembled identically, and to ensure the interchangeability of components.

Jigs

• A jig is a special device that holds, supports, locates, and also guides the cutting tool during the 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

Important Points

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.) and setting up of tools
• To increase the production
• To assure high accuracy of the parts
• Increase in interchangeability
• Reduce quality control expenses
• To reduce the operator’s labor and skill requirement

Explanation:

Fixtures:

• A fixture is a production tool used to locate accurately and hold securely one or more workpieces so that the required machining operations can be performed.
• A fixture should be securely fastened to the table of the machine upon which the work is done.
• The main purpose of a fixture is to locate the work quickly and accurately, support it properly, and hold it securely.
• Common types of fixtures used for the machining operations are:
  • milling fixture
  • turning fixture
  • grinding fixture etc.
• These fixtures consist of a base plate, standard clamps, and locators, setting blocks, and balancing weights.

The setting blocks:

• These are used to position the fixture and work relative to the cutter before machining.
• A feeler is introduced between the cutter and the setting faces of the block for the correct positioning of the cutter with the fixture.

Explanation:

Fixtures:

• A fixture is a production tool used to locate accurately and hold securely one or more workpieces so that the required machining operations can be performed.
• A fixture should be securely fastened to the table of the machine upon which the work is done.
• The main purpose of a fixture is to locate the work quickly and accurately, support it properly, and hold it securely.

Types of fixtures:

• Plate fixture
• Angle plate fixture
• Modified angle plate fixture
• Vice jaw fixture
• Indexing fixtures

Vice jaw fixture:

• This fixture is used for machining small parts.
• The standard vice jaws are replaced with jaws that are made to suit the work.

Plate fixture:

• These are the simplest form of fixtures. It is made from a flat plate which has a locater and clamps to locate and hold the part.

Angle plate fixture:

• This fixture is used for machining the part at a right angle to the locator.

Modified angle plate fixture:

• This fixture is used for machining the part at angles other than 90°.

Indexing fixtures:

• These fixtures are used for parts that require machining on evenly spaced surfaces.

Explanation:

Jig:

• A jig is a device in which a workpiece/component is held and located for a specific operation in such a way that it will guide one or more cutting tools to the same zone of machining.

Drill jigs of different types are made according to the shape of the component and the operations to be performed:

• Plate jig and channel jig
• Solid jig
• Post jig
• Sandwich jig
• Table jig (Turnover jog)
• Box (Tumble jig)
• Trunnion jig
• Latch jig/leaf jig etc.

Post jig:

• This is used for location from a bore.
• The post should be as short as possible to facilitate loading and at the same time, it must be long enough to support the workpiece.

Explanation:

Jig:

• A jig is a device in which a workpiece/component is held and located for a specific operation in such a way that it will guide one or more cutting tools to the same zone of machining.

Drill jigs of different types are made according to the shape of the component and the operations to be performed:

• Plate jig and channel jig
• Solid jig
• Post jig
• Sandwich jig
• Table jig (Turnover jog)
• Box (Tumble jig)
• Trunnion jig
• Latch jig/leaf jig etc.

Plate jigs:

• This jig consists of a drill plate that rests on the component to be drilled.
• For correct positioning/locating, pins and clips are provided.
• For heavier piece parts, sometimes clamps are not used.
• Generally, a base plate will not be available for this type of jig.
• When this type of jig is in the form of a channel, it is known as a channel jig.

Concept:

Jigs and fixtures are production tools used to accurately manufacture duplicate and interchangeable parts.

Jigs and fixtures are specially designed so that large numbers of components can be machined or assembled identically, and to ensure the interchangeability of components.

Jigs

• A jig is a special device that holds, supports, locates and also guides the cutting tool during the 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.) and setting up of tools
• To increase the production
• To assure high accuracy of the parts
• Increase in interchangeability
• Reduce quality control expenses
• To reduce the operator’s labour and skill requirement

Concept:

1. base plate or jig body
2. drill plate or jig plate
3. drill bushes locating pins
4. clamps

• Press-fit bushes
• Renewable bushes
• Liner bushes

• to restrict the movement of the component
• to position the piece part with respect to the tool
• to facilitate easy loading and unloading of component piece parts
• to assist the operator for correct loading (fool proofing).

Explanation:

• Jigs and fixtures are production tools used to accurately manufacture duplicate and interchangeable parts.
• Jigs and fixtures are specially designed so that large numbers of components can be machined or assembled identically, and to ensure interchangeability of components.
• Jigs and fixtures are made up of Stainless steel, Cast iron, High carbon steel, etc.

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.) and setting up of tools
• To increase the production
• To assure high accuracy of the parts
• Increase in interchangeability
• Reduce quality control expenses
• To reduce the operator’s labour and skill requirement

Explanation:

Jigs and fixtures are production tools used to accurately manufacture duplicate and interchangeable parts.

Jigs and fixtures are specially designed so that large numbers of components can be machined or assembled identically, and to ensure interchangeability of components.

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, boring, reaming, tapping, etc.

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
• Fixtures are used for medium and heavier sized work-pieces because fixtures are fixed to the machine table.

Explanation:

Jigs and fixtures are production tools used to accurately manufacture duplicate and interchangeable parts.

Jigs and fixtures are specially designed so that large numbers of components can be machined or assembled identically, and to ensure interchangeability of components.

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
• Fixtures are used for medium and heavier sized work-pieces because fixtures are fixed to the machine table.

Important Points

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

Jigs and fixtures are comprised of the following elements

• Base and body or frame with clamping fixtures
• Locating elements for proper positioning and orientation of the blank
• Supporting surfaces and base
• Clamping elements
• Tool guiding frame and bushes for jig only
• Indexing plates or systems
• Fastening parts

Explanation:

Jigs:

• A jig is a special device that holds, supports, is located, 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.
• Drilling jigs are used to drill, ream, tap, and perform other allied operations.
• Boring jigs are used to bore holes that are either too large to drill or of an odd size.

Drill jigs of different types are made according to the shape of the component and the operations to be performed:

• Plate jig and channel jig
• Solid jig
• Post jig
• Sandwich jig
• Table jig (Turnover jog)
• Box (Tumble jig)
• Trunnion jig
• Latch jig/leaf jig etc.

Latch or leaf jig:

• This type of jig will have a hinged cover with latch clamps for easy loading and unloading of components.
• The cover with latch must be positively located and clamped so that the bushes are accurately located with respect to the component.

Explanation:

Fixtures:

• A fixture is a production tool used to locate accurately and hold securely one or more workpieces so that the required machining operations can be performed.
• A fixture should be securely fastened to the table of the machine upon which the work is done.
• The main purpose of a fixture is to locate the work quickly and accurately, support it properly, and hold it securely.

Types of fixtures:

• Plate fixture
• Angle plate fixture
• Modified angle plate fixture
• Vice jaw fixture
• Indexing fixtures

Vice jaw fixture:

• This fixture is used for machining small parts.
• The standard vice jaws are replaced with jaws that are made to suit the work.

Plate fixture:

• These are the simplest form of fixtures. It is made from a flat plate which has a locater and clamps to locate and hold the part.

Angle plate fixture:

• This fixture is used for machining the part at a right angle to the locator.

Modified angle plate fixture:

• This fixture is used for machining the part at angles other than 90°.

Indexing fixtures:

• These fixtures are used for parts that require machining on evenly spaced surfaces.

Explanation:

• Jigs and fixtures are production tools used to accurately manufacture duplicate and interchangeable parts.
• Jigs and fixtures are specially designed so that large numbers of components can be machined or assembled identically, and to ensure interchangeability of components.
• Jigs and fixtures are made up of Stainless steel, Cast iron, High carbon steel, etc.

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.) and setting up of tools
• To increase the production
• To assure high accuracy of the parts
• Increase in interchangeability
• Reduce quality control expenses
• To reduce the operator’s labour and skill requirement

Explanation:

• A jig is a device in which a workpiece/component is held and located for a specific operation in such a way that it will guide one or more cutting tools to the same zone of machining.
• Types of drill jigs
• Drill jigs may be divided into two types
  • 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 most commonly used jigs are:
  • Pot jig
  • Template jig
  • Plate jig
  • Table jig
  • Sandwich jig
  • Angle plate jig
  • Modified angle plate jig
  • Box jig
  • Channel jig
  • Leaf jig
  • Indexing jig
  • Solid jig
  • Post jig
  • Trunnion jig

Pot type 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 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.

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Explanation:

Jig:

• A jig is a device in which a workpiece/component is held and located for a specific operation in such a way that it will guide one or more cutting tools to the same zone of machining.

Drill jigs of different types are made according to the shape of the component and the operations to be performed:

• Plate jig and channel jig
• Solid jig
• Post jig
• Sandwich jig
• Table jig (Turnover jog)
• Box (Tumble jig)
• Trunnion jig
• Latch jig/leaf jig etc.

Plate jigs:

• This jig consists of a drill plate that rests on the component to be drilled.
• For correct positioning/locating, pins and clips are provided.
• For heavier piece parts, sometimes clamps are not used.
• Generally, a base plate will not be available for this type of jig.
• When this type of jig is in the form of a channel, it is known as a channel jig.