Study sheet: Manufacturing, Motion and Automation

📋 Course Outline

1. Emerging Needs in Society
2. Additive and Subtractive Manufacturing
3. Linear Motion Fundamentals
4. Linear Motion and Acceleration
5. Mechanical Advantage and Machines
6. Pulley Systems
7. Intelligent Systems and Automation
8. Materials and Electrical Circuits
9. Series and Parallel Circuits
10. Circuit Diagrams and Measurements
11. Logic Gates and Control Systems
12. Copper Nickel Phase Diagrams
13. Manufacturing and Medical Materials
14. Natural and Synthetic Polymers
15. HDPE Properties and Uses

📖 1. Emerging Needs in Society

🔑 Key Concepts & Definitions

• Emerging problem : A current or future societal problem explored by identifying its scope, known and unknown variables, constraints, objectives, social issues, economic issues, environmental issues, success criteria and prototyping implications.
• Intelligent systems : Technologically advanced machines that perceive and respond to the world around them.
• Planned obsolescence : The deliberate design of a product with an artificially limited useful life or frail design so that it becomes obsolete after a predetermined period and encourages replacement purchases.

★ Must-know

• 🔄 The four phases are:

  1. explore
  2. develop
  3. generate
  4. evaluate and refine

• Examples of emerging societal problems include: lack of affordable space-saving housing, overpopulation and centralised rather than decentralised living conditions, reducing air-travel costs and the environmental impacts of increasing air travel, environmental health deterioration involving water quality and availability

• Renewable energy sources include:

  • solar
  • geothermal
  • hydro
  • wind
  • tidal
  • biomass

Further detail

• The identified engineering professions are:
  • micro-nano engineering
  • chemical engineering
  • aerospace engineering
  • environmental engineering
  • biomedical engineering
  • space engineering
  • processing engineering
  • software engineering
  • mechatronics engineering

💡 Memory Hook

Emerging societal needs → engineering solutions with social, economic, ethical and environmental impacts

📖 2. Additive and Subtractive Manufacturing

🔑 Key Concepts & Definitions

• Additive manufacturing : Creates objects by adding material, commonly layer by layer, and can produce internal lattice structures or porosities.
• Subtractive manufacturing : Creates objects by removing material from a larger piece of material.
• Hybrid manufacturing : Combines additive and subtractive manufacturing processes.

★ Must-know

📌 Additive manufacturing creates an object by adding material, whereas subtractive manufacturing creates an object by removing material from a larger piece.

• Additive manufacturing facilitates designs with internal structures or porosities for medical and industrial applications, including light-weighting and lean manufacturing.

• Rapid prototyping can use 3D printing and laser cutting to generate a prototype solution for a real-world problem, such as a hand-prosthesis component that holds a kitchen utensil.

Further detail

• Additive manufacturing facilitates lightweight and lean designs by producing components with internal structures or porosities for medical and industrial applications.

💡 Memory Hook

Additive manufacturing builds material; subtractive manufacturing removes material

📖 3. Linear Motion Fundamentals

🔑 Key Concepts & Definitions

• Linear motion : Motion in a straight line, which may be horizontal, vertical or along an incline.

★ Must-know

📌 Displacement is a vector measure of an object's change in straight-line position relative to an arbitrary fixed point.

Further detail

• Straight-line motion calculations consider:
  • displacement
  • time
  • initial velocity
  • final velocity
  • average velocity
  • acceleration

💡 Memory Hook

Position change → velocity → acceleration

📖 4. Linear Motion and Acceleration

🔑 Key Concepts & Definitions

• Displacement : The vector change in an object's straight-line position relative to a fixed point, measured in metres in SI units.

★ Must-know

📐 Formula — Average velocity equals displacement divided by time: $v_{av} = \frac{s}{t}$.

📐 Formula — Acceleration is the rate of change of velocity: $a = \frac{v-u}{t}$, and its SI unit is $\mathrm{m/s^2}$.

📐 Formula — For uniform acceleration, the first equation of motion is $v = u + at$.

Further detail

• Acceleration due to gravity is approximated as $g = 9.8\ \mathrm{m/s^2}$ near Earth, ignoring air resistance.

💡 Memory Hook

Displacement → velocity → acceleration

📖 5. Mechanical Advantage and Machines

🔑 Key Concepts & Definitions

• Mechanical advantage : The ratio of the output load force to the input effort force: $MA = \frac{F_L}{F_E}$.

★ Must-know

📐 Formula — Velocity ratio is the ratio of effort distance to load distance: $VR = \frac{d_E}{d_L}$.

📐 Formula — Machine efficiency is the ratio of mechanical advantage to velocity ratio: $\eta = \frac{MA}{VR}$.

📐 Formula — For a lever, the law of levers states that effort force times effort arm equals load force times load arm: $F_Ea_E = F_La_L$.

• The three lever arrangements are:
  • first-order: fulcrum between effort and load
  • second-order: load between effort and fulcrum
  • third-order: effort between load and fulcrum

Further detail

📌 A second-order lever always has mechanical advantage greater than 1, whereas a third-order lever always has mechanical advantage less than 1.

💡 Memory Hook

Greater effort distance → greater force amplification, but lower load distance.

📖 6. Pulley Systems

🔑 Key Concepts & Definitions

• Fixed pulley : Attached to a rigid support, and a 100 N load requires an effort of 100 N when the load is supported by the cable on only one side.

★ Must-know

• A moving pulley has one cable end attached to a stationary support and supports the load on both sides of the cable, so a 100 N load requires 50 N of effort ideally.

📌 Simple pulley systems combine fixed and moving pulleys with a single point of anchor, whereas compound pulley systems contain one fixed pulley and one or more moving pulleys and use a different velocity-ratio calculation.

📐 Formula — For a simple pulley system, velocity ratio equals the number of rope sections supporting the load: $VR = n$.

Further detail

• Pulley efficiency is generally between 80% and 95%, depending on bearing quality, load, and cable material.

💡 Memory Hook

Several rope strands sharing a suspended load.

📖 7. Intelligent Systems and Automation

★ Must-know

• Autonomous robots can sense their environment and act in the physical world to achieve specific goals.

• Intelligent-system research faces uncertainty from noisy sensors and effectors, continuously changing environments, time-consuming computation, and information loss when mapping a 3D world into 2D.

Further detail

• Computer vision research emerged in the late 1950s and early 1960s and enables computers to interpret visual information from images and video sequences.

• Rio Tinto operates 73 autonomous iron-ore transport vehicles in West Angelas, Australia, and the autonomous fleet is approximately 15% cheaper than a fleet with human drivers.

💡 Memory Hook

Sensing and computation → decisions and autonomous action.

📖 8. Materials and Electrical Circuits

🔑 Key Concepts & Definitions

• Metallic bonding : Consists of positive ion cores attracted to a mobile cloud of loosely bound valence electrons, making metals good electrical conductors.
• Electric current : The rate of flow of electric charge and is measured in amperes (A).

★ Must-know

📌 Ionic bonding occurs between a metal and a non-metal through electron transfer, whereas covalent bonding occurs when atoms share pairs of electrons.

📌 Direct current flows in one direction with constant voltage, whereas alternating current periodically reverses direction and is supplied to businesses and homes by power stations.

📐 Formula — Electrical power is the product of voltage and current: $P = VI$, and it is measured in watts (W).

📐 Formula — Ohm's law relates voltage, current, and resistance: $V = IR$.

📌 A series circuit requires a continuous loop containing the source, wires, and components; opening the loop stops current flow.

📐 Formula — For series resistors, total resistance is the sum of the resistors: $R_T = R_1 + R_2 + R_3 + \cdots$.

📐 Formula — In a series circuit, current is the same everywhere and total voltage equals the sum of voltage drops: $I_T = I_1 = I_2 = I_3$ and $V_T = V_1 + V_2 + V_3$.

Further detail

📐 Formula — Electrical energy is calculated from power and time: $E = Pt$, where time is measured in seconds and energy is measured in joules.

💡 Memory Hook

Metallic bonds provide mobile electrons; ionic and covalent bonds largely confine them.

📖 9. Series and Parallel Circuits

★ Must-know

📐 Formula — For a single-resistor circuit, voltage, current, resistance, power, and energy are related by $V=IR$, $P=VI$, and $E=Pt$.

• In a series circuit, total resistance is the sum of the resistors, total current is the same at every point, and total voltage equals the sum of the voltage drops.

📐 Formula — For a series circuit, the total resistance satisfies $R_T=R_1+R_2+R_3+\cdots$ and the total power satisfies $P_T=P_1+P_2+P_3+\cdots$.

📐 Formula — For two resistors in parallel, the voltage is common to both branches, the total current is the sum of branch currents, and the equivalent resistance satisfies $\frac{1}{R_T}=\frac{1}{R_1}+\frac{1}{R_2}$.

Further detail

📌 Adding resistors in parallel decreases total resistance, while a failed resistor does not stop current through the other intact parallel branches.

💡 Memory Hook

Series keeps current equal; parallel keeps voltage equal.

📖 10. Circuit Diagrams and Measurements

★ Must-know

• A voltmeter measures voltage drops or increases across components, whereas an ammeter measures current through a circuit or circuit section.

• The practical parallel-circuit investigation measures component and total resistance with the power off, applies a recordable voltage, records voltage and current in the circuit and branches, and calculates resistance using Ohm’s law.

Further detail

• Circuit diagrams represent components using standard symbols for resistors, variable resistors, voltage sources, wires, fuses, earth connections, switches, light bulbs, diodes, alternating current, direct current, ammeters, and voltmeters.

💡 Memory Hook

Picture the voltmeter across a component and the ammeter inserted in the current path.

📖 11. Logic Gates and Control Systems

🔑 Key Concepts & Definitions

• Control system : Manages, commands, directs, or regulates the behaviour of devices or systems using control loops.
• Programmable logic controller : An industrial solid-state computer that monitors inputs and outputs and makes logic-based decisions for automated processes or machines.

📝 Essential Points

• A NOT gate inverts one input: input 0 produces output 1, and input 1 produces output 0.

• An OR gate outputs 1 when either or both inputs are 1, whereas an AND gate outputs 1 only when both inputs are 1.

• A NOR gate is the opposite of OR, an XOR gate outputs 1 only when exactly one input is 1, and a NAND gate is the opposite of AND.

💡 Memory Hook

AND requires both inputs; OR requires at least one.

📖 12. Copper Nickel Phase Diagrams

🔑 Key Concepts & Definitions

• Phase diagram : Shows the phases an alloy forms at different temperatures and compositions under thermodynamic equilibrium.

★ Must-know

📌 A phase is a homogeneous, physically distinct portion of matter, whereas a component is an ingredient whose concentration can vary independently among phases.

• Copper-nickel alloys have complete solid solubility because the two metals have the same crystal structure, similar chemical characteristics, and roughly similar atomic sizes.

📌 The liquidus line marks the boundary above which an alloy is completely liquid, the solidus line marks the boundary below which it is completely solid, and the region between them contains solid and liquid.

• For a 30% nickel alloy at the stated temperature t2, the inverse lever rule gives a solid-to-liquid ratio of 10:27, corresponding to 27% solid and 73% liquid.

Further detail

• A copper-nickel phase diagram is constructed from arrestment points collected from cooling curves, with each point indicating the start or finish of a phase transformation.

💡 Memory Hook

Cool: liquid → liquid plus alpha → alpha solid.

📖 13. Manufacturing and Medical Materials

🔑 Key Concepts & Definitions

• Prosthesis : An artificial body part used to replace a damaged structure such as a hip, limb, or heart.
• Bioceramics : Specialized ceramics used mainly in orthopaedics and dentistry, including bone cements and bone-grafting materials.
• Biocompatibility : The ability of a material to integrate with natural tissues without adverse reactions.

📝 Essential Points

• Bone cements are often made from calcium phosphate compounds that mimic bone mineral and anchor implants or fill bone voids.

• The listed manufacturing techniques are:

  • cold working
  • hot working
  • annealing
  • casting
  • forging
  • welding
  • rolling
  • extrusion

💡 Memory Hook

Shape materials by working, casting, forging, welding, rolling, or extrusion.

📖 14. Natural and Synthetic Polymers

🔑 Key Concepts & Definitions

• Polymer : A natural or synthetic substance composed of very large macromolecules formed from repeated simpler chemical units called monomers.

★ Must-know

• Examples of natural polymers include:

  • protein
  • cellulose
  • starch
  • silk
  • shellac
  • DNA
  • lignin
  • wood
  • resins

• Natural polymers generally have complex, variable structures and are often biodegradable, whereas synthetic polymers have more uniform repetitive chains and are mostly non-biodegradable.

• Natural polymers are produced by living organisms and found in nature, whereas synthetic polymers are man-made through chemical synthesis, usually from petroleum-based sources.

• Natural polymers generally have complex and variable structures and are often biodegradable, whereas synthetic polymers have uniform, repetitive monomer chains engineered for consistency.

• Natural polymers are generally biodegradable and decompose naturally, whereas synthetic polymers are mostly non-biodegradable and can persist in the environment for long periods.

• Examples of natural polymers include:

  • protein
  • cellulose
  • starch
  • silk
  • shellac
  • DNA
  • lignin
  • wood
  • resins

Further detail

• Natural polymers are commonly associated with moderate strength and flexibility affected by heat and moisture, whereas synthetic polymers can be engineered for strength, flexibility, heat resistance, and chemical resistance.

• Natural polymers commonly follow composting or natural decomposition pathways, while synthetic polymers may undergo landfill disposal, incineration, or recycling when available.

📌 Natural polymers generally have moderate strength and flexibility and are affected by heat and moisture, whereas synthetic polymers can be engineered for tailored strength and flexibility and resistance to heat and chemicals.

• Natural polymers are used in bioplastics, packaging, food wraps, adhesives, and fibres, whereas synthetic polymers are used in construction, automotive products, consumer goods, and electronics.

💡 Memory Hook

Natural polymers come from organisms; synthetic polymers are chemically manufactured.

📖 15. HDPE Properties and Uses

🔑 Key Concepts & Definitions

• High-density polyethylene : a thermoplastic polymer with a high strength-to-density ratio that is used to produce plastic bottles, corrosion-resistant piping, and plastic lumber

📝 Essential Points

• HDPE applications include:
  • plastic bottles
  • corrosion-resistant piping
  • plastic lumber

📊 Synthesis Tables

Manufacturing Process Comparison

Process	Material action	Application
Additive manufacturing	Adds material	Internal structures or porosities
Subtractive manufacturing	Removes material	Shaping a larger piece
Hybrid manufacturing	Adds and removes material	Combined manufacturing processes

Lever types

Lever type	Arrangement	Mechanical advantage
First order	Fulcrum between effort and load	Greater than 1 if effort arm is longer; less than 1 if load arm is longer
Second order	Load between effort and fulcrum	Always greater than 1
Third order	Effort between load and fulcrum	Always less than 1