Engineering Materials: Properties and Heat Treatment
Ferrous and Non-Ferrous Materials Comparison
| No. | Ferrous Materials | Non-Ferrous Materials |
|---|---|---|
| 1. | Contain iron as the main constituent | Do not contain iron |
| 2. | Magnetic in nature (most ferrous metals) | Non-magnetic |
| 3. | High tensile strength | Generally lower tensile strength (except some alloys) |
| 4. | More prone to rust and corrosion | High resistance to corrosion |
| 5. | Usually heavier | Usually lighter in weight |
| 6. | Less expensive | More expensive |
| 7. | High melting point | Lower melting point |
| 8. | Good for structural applications | Good for electrical and |
Essential CNC Machine Concepts and Technical Specifications
CNC Machine Specifications and Capacity
The specification of a CNC machine gives detailed information about the capacity, size, accuracy, and performance of the machine.
Important CNC Machine Specifications
- Machine Type – CNC lathe, CNC milling machine, CNC machining center
- Table Size – Length × width of worktable
- Maximum Workpiece Size
- Spindle Speed Range – Minimum and maximum RPM
- Feed Rate – Rapid and cutting feed
- Number of Axes – 2-axis, 3-axis, 4-axis, 5-axis
- Tool Capacity – Number of tools
Heat Transfer Modes: Radiation, Planck’s Law, and Convection Analysis
Radiation Heat Transfer Fundamentals
Radiation heat transfer is the transfer of thermal energy from a body in the form of electromagnetic waves (mainly infrared radiation).
It does not require any medium, so it can occur even in a vacuum. A common example is the heat reaching Earth from the Sun.
Radiation vs. Conduction and Convection
| Mode | Medium Required? | How Heat Transfers |
|---|---|---|
| Conduction | Yes (solid) | By direct molecular contact |
| Convection | Yes (fluid – liquid/gas) | By actual movement of fluid particles |
| Radiation | No |
·A “Bourdon Tube” is used in: PRESSURE SENSORS
1)CCD Camera?
A CCD (Charge Coupled Device) is an electronic sensor used in cameras to capture digital images
It converts light → electrical charge → digital data
Each pixel stores charge proportional to the light intensity, forming the image
Construction
CCD is based on a MOS (Metal–Oxide–Semiconductor) structure, not a simple pn junction
Main parts:
P-type semiconductor body
Thin silicon dioxide insulating layer
Array of gate electrodes
When a positive voltage is applied to the gate:
Holes are repelled
Read MoreUnderstanding Adaptive Passive Vibration Absorbers and AVC Systems
Adaptive Passive Vibration Absorber (APVA) & Methods: An Adaptive Passive Vibration Absorber is a device that reduces unwanted vibrations in machines or structures. Unlike normal (fixed) passive absorbers, an APVA can adjust its own properties — such as mass, stiffness, or damping — to work effectively even when the vibration frequency changes. It does not require active control or high power, so it is still considered passive, but it can adapt automatically or semi-automatically to new
Read MoreManufacturing Processes Lab: CNC, Welding, Casting, and Lathe Operations
CNC Laser Cutting Machine Operations
Study of CNC Laser Cutting Machine
Objective
To understand the working principle, components, and operation of a CNC laser cutting machine.
Apparatus Required
- CNC laser cutting machine
- Design software (e.g., CorelDRAW or AutoCAD)
- Material sheet (wood, acrylic, etc.)
- Safety goggles
Theory
CNC (Computer Numerical Control) laser cutting is a non-contact thermal process that uses a focused laser beam to cut materials with high precision. The laser melts or vaporizes the material,
Read More