30 Questions
What do YELLOW signs indicate in a workplace?
Danger is present but precautions have been taken to minimize the risk
What is the primary advantage of stainless steel over regular steel?
Increased strength and corrosion resistance
What is the process of creating a 3D printed part called?
Additive layer manufacturing
What is the primary purpose of using jigs in metal fabrication?
To ensure fabrication repeatability
What is the process of making inside threads in holes using taps?
Tapping
What is the purpose of a CAD drawing in 3D printing?
To design and visualize the part before printing
What is the primary use of soldering in metal fabrication?
To join electrical devices and copper wires
What is the primary advantage of 3D printed parts?
They are less expensive and faster to produce
What is the characteristic of solder that makes it suitable for joining electrical devices?
Its low melting point
What is the alloy composed of iron and carbon?
Steel
What is the purpose of a YouTube link in the text?
It is not relevant to the text and is merely a distraction
What do GREEN signs indicate in a workplace?
Help is available during dangerous situations
What is the purpose of RED signs in a workshop?
To indicate high risk or death danger, prohibition, or fire equipment
What does PPE stand for in the context of workshop safety?
Personal Protective Equipment
What is the purpose of CAM in engineering?
Computer Aided Manufacturing
What is the primary application of the 555 TIMER in engineering?
Timing and oscillation circuits
Which type of joint is used to connect two wooden pieces at a 90-degree angle?
Half corner block
What is the term for the process of shaping metal by heating and pouring it into a mold?
Sand Casting
What is the purpose of a cam lock in a knock joint?
To allow the pin head to enter between the cam grooves and tighten the joints
What is the primary advantage of a truss structure?
It can withstand a heavier load due to its triangular shape
What is the main function of a tie in a truss structure?
To tie two beams together to prevent them from moving apart
What is the main difference between metal and wooden beams?
Metal beams are more popular than wooden beams
What is the purpose of a captive barrel nut and bolt in a knock joint?
To screw the two pieces of wood together using a long screw
What is the primary consideration when selecting a beam for a structure?
The shape and size of the beam
What type of follower is suitable for high load applications?
Roller follower
What is the main function of gears in a mechanical system?
To transmit motion
In a bicycle gear system, what is the role of the pedal gear?
Driver gear
What is the purpose of an idler gear in a gear system?
To connect two gears that rotate in the same direction
How do the pedal gear and back wheel gear rotate in a bicycle?
In the same direction, at the same speed
What happens to the shaft of an idler gear when it rotates?
It remains stationary
Study Notes
Workshop Safety
-
Safety signs are categorized into three colors:
- Yellow signs indicate danger, but precautions have been taken to minimize the risk.
- Green signs show help during dangerous situations, such as emergency escape, first aid, and fire exit.
- Red signs indicate high risk or death danger, and prohibit certain actions.
-
Personal Protective Equipment (PPE) is essential for workshop safety.
Metal Fabrication Processes
- Deforming: bending by hand using jigs to ensure fabrication repeatability.
- Threading and tapping: making outside threads on a shaft using thread making dies, and making inside threads in holes using taps.
- Joining metals using heat: soldering, which involves melting solder at a low temperature (300°C) to join metals.
Metallic Alloys
- An alloy is a combination of a pure metal and another metal or non-metal to upgrade its properties.
- Examples of alloys include:
- Bronze (Copper + Tin): increased hardness and strength.
- Brass (Copper + Zinc): increased hardness and yellowish color.
- Steel (Iron + Carbon): increased hardness, strength, and corrosion resistance.
- Stainless Steel (Iron + Carbon + Nickel + Chromium): increased strength, corrosion resistance, and shininess.
Plastics
- 3D printing: creating objects by layering fused plastic, using CAD drawings and 3D printer files.
- 3D printing is used in various industries, including medical implants and aircraft parts.
Composites
- Not mentioned in the provided text.
Textiles
- Not mentioned in the provided text.
Wood
- Knock-down joints: Half corner block, Cam lock, Captive barrel nut and bolt, and Corner plates.
- These joints are used to connect wood pieces together.
Properties of Materials
- Not mentioned in the provided text.
Structures
- To build structures, a builder needs to consider two things:
- Material type (e.g., metal or wood)
- Shape/Geometry (e.g., trusses, which adopt the natural strength of the triangular shape)
- Trusses are used in bridges, roofs, and other structures to distribute weight along their span.
- Ties are tension beams used in trusses to tie two beams together.
CAMs
- A roller follower rotates on a cam, providing low friction and heat, and withstanding high load.
- Not very accurate on sharp profiles.
Gears
- Gears are used to transmit motion.
- A driver gear is connected to a power source, and a driven gear is connected to the output.
- Gears can be connected by chains or directly.
- Idler gears are used to change the direction of rotation between two gears.
Logic Gates
- Not mentioned in the provided text.
CAD-CAM
- CAD stands for Computer-Aided Design.
- CAM stands for Computer-Aided Manufacture.
Design Process
- Not mentioned in the provided text.
Test your knowledge on workshop safety, metal fabrication processes, and materials used in engineering. Covers safety signs, PPE, metal deformation, joining, and protection, as well as plastics, textiles, and wood. For year 10 students.
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