Podcast
Questions and Answers
Assembly drawings are important for _____ in product development.
Assembly drawings are important for _____ in product development.
understanding
Match the following learning objectives with their descriptions:
Match the following learning objectives with their descriptions:
Understand the need for CAD assemblies = Recognizing the importance of CAD in design Create assembly structures in CAD = Using CAD tools to create product assemblies Learn about standard parts in mechanical design = Identifying commonly used components in engineering Read assembly drawings = Interpreting technical drawings for manufacturing
How many possible bearings can be found in the drawing?
How many possible bearings can be found in the drawing?
Creating assemblies in CAD allows for constraints to be applied to degrees of freedom.
Creating assemblies in CAD allows for constraints to be applied to degrees of freedom.
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What is the first step in bottom-up modeling?
What is the first step in bottom-up modeling?
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What should the chosen approach for creating assembly models match?
What should the chosen approach for creating assembly models match?
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Mechanical systems often utilize standard parts that can be purchased in different __________ off the shelf.
Mechanical systems often utilize standard parts that can be purchased in different __________ off the shelf.
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The assembly structure typically consists of a main assembly and multiple sub-assemblies.
The assembly structure typically consists of a main assembly and multiple sub-assemblies.
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What are the components of the Wheel Sub-Assembly in the car example?
What are the components of the Wheel Sub-Assembly in the car example?
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Match the following terms with their descriptions:
Match the following terms with their descriptions:
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Which of the following is essential for evaluating a product in CAD?
Which of the following is essential for evaluating a product in CAD?
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The main assembly is built by assembling various ______ together.
The main assembly is built by assembling various ______ together.
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It is unnecessary to recognize standard mechanical parts in a 2D drawing.
It is unnecessary to recognize standard mechanical parts in a 2D drawing.
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Match the components with their respective quantities in the car assembly example:
Match the components with their respective quantities in the car assembly example:
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All parts of an assembly must be modeled before starting the assembly process.
All parts of an assembly must be modeled before starting the assembly process.
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What does the term 'Normteil' refer to in the context of assembly structures?
What does the term 'Normteil' refer to in the context of assembly structures?
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Which statement regarding the assembly constraints for the axle is true?
Which statement regarding the assembly constraints for the axle is true?
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Standard parts are always officially normed.
Standard parts are always officially normed.
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What are two types of standard parts mentioned?
What are two types of standard parts mentioned?
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Standard parts are used to reduce the effort to draw common parts or ______.
Standard parts are used to reduce the effort to draw common parts or ______.
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Match the terms with their descriptions:
Match the terms with their descriptions:
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What is the primary function of ball bearings?
What is the primary function of ball bearings?
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O-rings are used to seal rotary motion parts only.
O-rings are used to seal rotary motion parts only.
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What is the primary benefit of using standard components?
What is the primary benefit of using standard components?
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The CAD assembly focuses on only structural design without considering constraints.
The CAD assembly focuses on only structural design without considering constraints.
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What component is used to connect and secure a rotating machine element to a shaft?
What component is used to connect and secure a rotating machine element to a shaft?
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To facilitate assembly, components must adhere to specific ______ constraints.
To facilitate assembly, components must adhere to specific ______ constraints.
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Springs are used to ______ parts and assemblies or store energy.
Springs are used to ______ parts and assemblies or store energy.
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Match the following standard components with their functions:
Match the following standard components with their functions:
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Which component primarily reduces friction in mechanical assemblies?
Which component primarily reduces friction in mechanical assemblies?
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Gears are often used to adjust the torque in a mechanical system.
Gears are often used to adjust the torque in a mechanical system.
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What type of gear is mentioned as a component in the document?
What type of gear is mentioned as a component in the document?
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Study Notes
Engineering Design and Material Selection - Lecture 7
- Lecture covers CAD assemblies and standard mechanical parts.
- Dr. Tino Stankovic and Prof. Dr. Kristina Shea are instructors.
Course Schedule
- Week 1: Introduction and Sketching. Case study: Health. Instructor: Prof. Dr. Kristina Shea
- Week 2: Introducing Engineering Design. Case study: Health. Instructor: Prof. Dr. Kristina Shea
- Week 3: Technical Drawing: Projections and Cuts.
- Week 4: CAD: Introduction and Modeling Operations.
- Week 5: CAD: Features and Parametric Modeling. Case study: Future Mobility. Instructor: Dr. Tino Stankovic
- Week 6: CAD: Freeform Modeling.
- Week 7: CAD: Assemblies and Standard Mechanical Parts. Case study: Health. Lecture duration: 45 minutes. Instructor: Dr. Tino Stankovic.
- Week 8: Technical Drawing: Dimensioning.
- Week 9: Sustainability in Engineering Design.
- Week 10 & 11: Materials and their Properties, Manufacturing Processes with a focus on Additive Manufacturing, Sustainable Materials. Instructor: Prof. Dr. Kristina Shea
- Week 12: Material Selection.
- Week 13: Review and Q&A. Lecture duration: 75 minutes. Instructor:Prof. Kristina Shea
Quiz 1 Information
- Students need to bring their ID, pencil/pen, and one sheet of A4 paper.
- Closed-book quiz; no calculators, notes, or electronic devices allowed.
- Dictionaries (English-German, English-French, English-Italian) are provided.
- Ensure computer login access in exercise room.
- If unwell, do not attend the quiz. Inform instructor ([email protected]) of absence before or after the quiz. Provide confirmation of illness with doctor's certificate, if needed.
Learning Objectives
- Understand the need for CAD assemblies in product development.
- Create assembly structures in CAD.
- Learn about standard parts in mechanical design.
- Read assembly drawings and identify standard parts.
Why Assembly Drawings Are Needed
- Diagrams explain how different components fit together.
Assembly Example: Car
- A visual diagram of assembled car.
Part List
- Shows a comprehensive listing of individual parts in an assembly (e.g. car).
CAD Assemblies Support
- Assembly Drawings: Help in checking functionality and interference analysis.
- Bill of Materials: Documents all the parts needed for assembly.
- Norm Elements: Guide to use of parts for assembly.
- CAD Assembly: Provides a detailed digital model; this assembly process can be visualized via interference analysis and motion simulation.
- Part Re-Use: Helps to reuse existing parts to build new ones and to identify potential conflicts.
- Assembly and Disassembly Evaluation: Supports the process to evaluate the quality and functionality of a given design.
- Manufacturing Planning: Guides manufacturing based on the assembly and planning analysis.
Breathe: Motion Simulation
- An example of motion simulation of a mechanical element.
CAD Model of the PLUS II
- Illustration depicting an exploded view of a vehicle (PLUS II), emphasizing the breakdown and assembling process of various components (e.g., bodywork, chassis, windshield, components etc).
Assembly Structure
- Diagrammatic illustration representing hierarchical structure, showing the relationships between main assembly, sub-assemblies, standard elements, and component Parts.
Bottom-Up Modeling
- Begin modelling with smallest parts, then gradually build up more complex structures.
CAD Assembly Bottom-Up Modeling
- Process showing how to create assembly models.
- Steps: 1. Build parts 2. Create subassemblies 3. Assemble to create the final assembly.
Assembly Features in CAD
- Functions used in CAD to define the relationship between component’s features.
- Examples: “Against, Align Co-planar, Offset, Co-axial”.
Part Positioning with Kinematic Simulation (Universal Joint)
- Relevant to part positioning and kinematic simulation procedures using (D-Cubed 3D DCM).
- Using the software (UGS) to carry out design activities and ensure compliance with required specifications.
Assembly Constraints in NX
- Constraint implementation options in NX software.
- Examples: Touch Align, Concentric, Distance, Fix, Angle, and others.
Setting Constraints in NX
- Explanation of the method for setting constraints using the software NX.
- The process includes setting specific parameters for constraints, such as selecting components, orientation, and alignment.
Assembly Array
- Explain about creating patterns using repeating components on the software NX.
- Shows various possible constraints.
CAD Assembly General Creation
- Shows general creation method in the assembly software NX.
- Illustrates procedures to create an empty file and the procedure of inserting and connecting components using the software NX.
Assembly Constraints: Car
- Shows different methods that can be used for assembly constraint examples on a car.
- This involves diagrams and/or illustrations.
Mechanism's movement while respecting constraints.
- Explanation on the implementation on assembly software of the dynamic positioning for the movement of components while respecting the predefined constraints.
CAD Assembly: Assembly Structure and Constraints in NX
- Illustration of assembly navigator, constraints, parts, information, and components used in NX software.
Standard Parts (ISO)
- Types of standard components
- Standard components are parts purchased from an external vendor. Examples include bearings.
- Standard elements are predefined and common types used in many assemblies, contributing to ease and simplification.
Standard Components Examples
- Detailed description and function of several standard components, including nuts and bolts, circlips, springs, ball bearings, parallel keys, rotary shaft lip seals, gears, and O-rings.
Gearbox Assembly – Exploded View
- Illustrated view of a gearbox, showing its components in an exploded, disassembled state (in a CAD software).
Section Views in Assemblies
- Diagram illustrating section views typically within larger assemblies, in a mechanical drawing.
Part Families of Standard Parts
- Organization of standard part libraries, enabling reuse of similar parts. Including LEGO elements, DIN parts, and Reuse Libraries, types of keys.
Gearbox Example
- Examples of geared component design illustrated by graphics and diagrams.
Gearbox Example – Usage
- Illustrative examples of a gearbox with a worm gear used in an ETH robot.
Gearbox Example – Exploded View
- Detailed illustration of a dissembled gearbox, highlighting individual components (in CAD).
Connection of Threaded Parts
- Detailed illustration explaining how threads are connected (e.g. external threads and internal ones).
Screw Connections
- Diagrams illustrating various screw connections, in drawings or diagrams. Includes references to rubber seals.
Standard Part Selection
- A table showing the selection criteria, size/length, and thread diameter of standard parts (ISO).
Screws, Bolts, Nuts & Washers
- Detailed diagram featuring ISO specifications regarding screw connections, nuts, bolts and washers.
Bearing and Circlip
- Detailed information in diagrams of bearing and circlip components.
Seals
- Illustration and description (in a diagram/drawing) about types of seals like O-rings, radial shaft lip seal.
Key & Gearing
- Illustrations of keys and gearing concepts and examples.
How Many Bearings Can Be Found in This Drawing?
- Question about the count of bearings present in a given diagram.
CAD Assemblies and Standard Mechanical Parts: Wrap-up
- Summarized overview of CAD assemblies and standard parts, emphasizing their importance in product design.
Exercise 7: Working with CAD Assemblies
- Practical exercise to create an assembly model in CAD software.
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Description
This quiz focuses on assembly modeling concepts in CAD, including learning objectives, assembly structures, and components essential for product development. Students will explore constraints, standard parts, and the bottom-up modeling approach to enhance their understanding of mechanical systems and assemblies.
