Understanding Physical Quantities and Measurement Principles
Understanding Physical Quantities and Measurement
Define the term ‘physical quantities’.
Physical quantities are all those properties or qualities of matter, energy, and measurable space.
Identify which of the following are physical quantities:
Density, Volume, Length, Temperature, Area, Pressure, Time.
Note: Ira, Patriotism, Beauty, Citizenship, Feeling, and Love are not physical quantities.
What is Measurement?
Measurement is the process of comparing two magnitudes of the same nature, using one as the
Read MoreConstruction Staking: Tools, Techniques, and Best Practices
Introduction to Construction Staking
Staking, in general, is the process of determining and marking the position an element should occupy in the field.
In the field of construction, this refers to marking and drawing on the work itself, at a natural scale, any building element defined in the project.
Instruments and Supplies for Construction Staking
These tools are grouped according to their function:
- Length measurement: measuring tape
- Verification of verticality: plumb bob
- Verification of horizontality:
Engineering Materials: Properties, Types, and Applications
Classification of Engineering Materials
Ferrous Materials
These are materials that contain iron as their primary constituent.
Examples: Cast iron, steel, wrought iron.
Characteristics: High strength, magnetic properties, prone to corrosion unless treated (e.g., stainless steel).
Non-Ferrous Materials
These materials do not contain iron as a major component.
Examples: Aluminum, copper, titanium, brass, bronze.
Characteristics: Lightweight, corrosion-resistant, good electrical conductivity.
Alloys
A mixture
Read MoreRelays, Circuits, and Electromagnetism Explained
Relays: How They Work
A relay consists of two primary mechanisms:
- An electromagnet that can be controlled by low-intensity current.
- Contacts that open and close due to the electromagnet’s action.
Low-intensity current is used to control a larger current. A relay is composed of the electromagnet (coil and core), contacts (open and closed), springs, coil connections, and a common terminal.
Relay Operation Example
Consider a system with two lamps, two batteries, and two relays:
- When electricity is supplied
Woodworking Machinery: Functions and Uses
Sierra Multiple
Function: Performs multiple simultaneous cuts on pieces of timber in a parallel fashion. The distances between the cuts determine the width to be achieved.
Components:
- Horizontal table guide
- Horizontal axis table wing (above the table) with multiple circular saws
- Feeding system acting on both sides of the piece
The table is fixed; only the feeding system is mobile and must adapt to the bulk of the pieces.
Tupi (Spindle Moulder)
Function: Shapes wood using a series of tools or cutters (bits)
Clutch Friction: Components, Types, and Operation
Clutch Friction
Friction is heavily used with mechanical disc clutches, which are simple and easy to maintain. For reasons of disk space, they can not be dry mounted and use dual clutch and multi-farm bikes and bathed in oil.
Function
It consists in bringing the disk between 2 flat plates that pressure to get turn forming a part and transmit the rotation and torque of the motor to the gearbox. When you need to disengage the clutch, the driving force that presses the disc decreases until it turns freely
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