Mechanical, Electrical and Instrumentation Engineering for Non-Engineers
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Transcript of Mechanical, Electrical and Instrumentation Engineering for Non-Engineers
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MECHANICAL, ELECTRICAL AND INSTRUMENTATION
ENGINEERING FOR NON-ENGINEERS
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Force
• Force: A push or pull on an object resulting from its interaction with another object.
• The unit of a force is Newton [N].
5 m
45°
100 N
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Force• Equation F = ma gives the relationship between:
– Force (N)– Mass (kg)– Acceleration (m/s2)
– Also known as “Newton’s second law of motion”.
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Work
• Defined as “force through distance”.
• In other words–“ when a body moves under the influence of
a force, work is done”.
work = force x distance–The unit of work is Joules.
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Energy• Energy may be broadly defined as the ability to do
work.
• Energy cannot be created or destroyed.
• We merely change energy types, e.g. convert potential energy into kinetic energy.
• The unit of energy is Joules.
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Different Energy Forms
• Potential energy: Energy stored in a system, typically due to its height, but others include springs, pressure, chemical, heat etc.
• Kinetic energy: Energy possessed by a body by virtue of its motion.
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Isometric and Oblique Projections
isometric projection of a cube
oblique projection of a cube
• Isometric drawings: The two axes are at 60° to the vertical axis, and the measurements along these are either a scale of (or equal to) those measurements on the actual object.
• Oblique drawings: the two axes are at right angles to each other, and the third axis is at 45° to them.
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First-Angle Projection• Three views:
• Front view: Drawn looking straight at the front of the object.
• Side view: The left side of the object is drawn toward the right side view of the object and vice versa.
• Plan View: The top of the object is drawn toward the bottom view of the object and vice versa.
• Used mainly in Europe.
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Sectional Views
• Sectional views are used to clarify interior or hidden details on a multi-view drawing of an object.
• For a sectional view the observer is required to imagine that the object has been cut by a plane (the cutting plane) and that the part of the object nearest to the observer has been removed.
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Sectional View Types
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Sectional View Types
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Dimensions• Dimension: A means of specifying the size of a
part, such as its length, diameter, width and thickness.
• All dimensions required for manufacturing and assembly must appear on detail drawings.
• Nominal dimension: the size by which a part is referred to as a matter of convenience, or the size on which the design is based.
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DO YOU WANT TO KNOW MORE?
If you are interested in further training or information, please visit:
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