Types of Jigs and Fixtures Quiz

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Questions and Answers

What is the purpose of spring-loaded locators in a workholder?

To control the speed of the machine

To increase the weight of the workpiece

To provide electrical connections

To ensure accurate location of parts (correct)

Which term describes the size used when discussing an element?

Allowance

Nominal size (correct)

Tolerance

Limits

What does clearance refer to in mating cylindrical parts?

The maximum stated interference

The basic dimension of a component

The difference in length between two parts

The general term for the relationship of a bolt and a hole (correct)

What distinguishes unilateral tolerance from bilateral tolerance?

Only one limit is considered for unilateral tolerance Signup and view all the answers

Which of the following describes the relationship between an internal member and an external member in interference?

The internal member is larger Signup and view all the answers

What is the primary difference between jigs and fixtures?

Jigs guide the cutting tool while fixtures only hold the workpiece. Signup and view all the answers

Which type of jig is known for its simplicity and accuracy?

Template jig Signup and view all the answers

Which of the following is considered a disadvantage of using jigs and fixtures?

They can wear away over time. Signup and view all the answers

What does a bushing do in relation to the cutting tool?

It guides the cutting tool or drill. Signup and view all the answers

Which type of fixture is used primarily for angle support?

Angle plate fixture Signup and view all the answers

What is a common feature of a jig body?

It houses or supports the workpiece. Signup and view all the answers

Which type of jig is specifically designed to create accurate locations for holes?

Drill bushing Signup and view all the answers

What is a potential impact of high initial set up costs for jigs and fixtures?

Reduced overall production volume. Signup and view all the answers

Which type of jig is specifically mentioned as being useful for drilling thin or soft parts?

Sandwich Jig Signup and view all the answers

What type of jig totally surrounds the part, allowing for drilling from all sides?

Box Jigs Signup and view all the answers

Which clamping device is noted as the most popular in workshops and tool rooms?

Lever of Strap Clamps Signup and view all the answers

What is a key consideration for the clamping system when holding a workpiece during operations?

It needs to withstand operational forces Signup and view all the answers

For which type of components are Indexing Jigs primarily used?

To accurately space holes or machined areas Signup and view all the answers

Which type of jig allows for easier loading and unloading of parts due to its hinged design?

Leaf Jigs Signup and view all the answers

What is a critical factor to consider in minimizing operator fatigue during clamping?

Choosing clamping devices with a smooth operation Signup and view all the answers

What is the primary purpose of a clamping device in a jig or fixture?

To hold the work in the correct position during operation Signup and view all the answers

What characteristic makes toggle action clamps particularly useful?

They move completely free of the work for faster operation. Signup and view all the answers

Which type of clamp is specifically designed for rapid clamping using a single screw?

Two-Way Clamps Signup and view all the answers

What is the primary function of locating points in workholder design?

To ensure the workpiece is accurately positioned for tool guiding. Signup and view all the answers

Which clamp type typically requires hydraulic, pneumatic, or air-to-hydraulic power?

Power-activated Clamps Signup and view all the answers

In the context of workholder design, what does avoiding redundant location refer to?

Preventing duplicate locators that could confuse placement. Signup and view all the answers

Which type of clamp is known for being fast-acting and allowing easy part insertion?

Toggle Action Clamps Signup and view all the answers

What is the function of positioning locators in workholding?

To reference the workpiece and ensure repeatability. Signup and view all the answers

What advantage do non-mechanical clamps like magnetic and vacuum chucks offer?

They hold parts that are difficult to secure with traditional clamps. Signup and view all the answers

Study Notes

Jigs and Fixtures

Jig: A work holding device that supports, locates, and guides the cutting tool for specific operations.
Fixture: Holds and locates the workpiece without guiding the cutting tool; provides only reference surfaces.
Types of Jigs:
- Template, Plate, Diameter, Channel, Ring, Box, Leaf, Angle Plate, Indexing, Trunion.
Types of Fixtures:
- Plate, Angle Plate, Vise-jaw, Indexing, Multistation, Profile.
Advantages of Jigs and Fixtures:
- Reduced skill requirements for operators.
- Lower production costs.
- Increased machine and labor efficiency.
- Simplification of work handling.
Disadvantages of Jigs and Fixtures:
- Potential for wear over time.
- High initial setup costs and time.
- Material-intensive and often bulky.

Manufacturing Processes

Mass Production: Focused on high productivity and interchangeability to lower unit costs and ease assembly.
Jig Borer: Tool used for precise placement and drilling of holes in dies, jigs, fixtures, and other parts.
Bushing: Guides the cutting tool or twist drill during production runs.

Components of a Jig

Jig Body: Main structure housing the workpiece.
Jig Cover: Secures workpiece together with clamping device.
Clamping Device: Secures the jig on the drill table.
Bushing: Guides the drill and minimizes part replacement.
Locating Points: Specifies the positions of holes or components.

Clamping in Jigs and Fixtures

Clamping Elements: Secure the workpiece in place during operations.
Types of Clamping Devices:
- Lever or Strap Clamps: Common in workshops.
- Screw Clamps: Cost-effective but slower to operate.
- Cam-action Clamps: Efficient for quick holding.
- Hinged Clamps: Allow easy loading and unloading.
- Two-Way Clamps: Apply force from two directions.
- Wedge Operated Clamps: Self-holding with minimal components.
- Toggle Action Clamps: Fast operation with free movement.
- Power-activated Clamps: Operate under hydraulic or pneumatic power.
- Chucks and Vises: Commonly used with minor modifications.
- Non-mechanical Clamps: Magnetic and vacuum systems for challenging parts.

Locator Design and Measurement

Locating Points: Facilitate accurate positioning of the workpiece in jigs and fixtures.
Positioning Locators: Primary function is referencing and ensuring repeatability.
Avoiding Redundant Location: Design should prevent unnecessary duplicate locators.
Spring-loaded Locators: Assist in ensuring accurate positioning of workpieces.
Common Dimensioning Terminology:
- Nominal Size: Descriptive size of elements.
- Limits: Maximum and minimum dimensions.
- Tolerance: Variation allowed between limits.
- Clearance and Interference: Refers to the fit between cylindrical parts.
- Allowance: Minimum clearance or maximum interference specified.
Understanding Fit: Identifies the clearance or interference between mating parts, crucial for effective assembly.

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Description

Test your knowledge on jigs and fixtures with this quiz. Learn about the different types of work holding devices and their specific purposes in guiding tools for various operations. Perfect for students and professionals in manufacturing and engineering!