2. DESCRIPTION OF MECHANISM
Deals with the physical nature of
whatever is being discussed, the
purpose of the device and how its
parts work separately and with one
another and the whole.
3. Background
• Writing mechanism descriptions is a
critical ability of an engineer.
• The engineer creates a mechanism
description to document and specify the
device so the customer can decide if it
fulfills their needs.
4. What is a Mechanism?
“Mechanism descriptions are
precise portrayals of material
devices with two or more parts
that function together to do
something.”
5. DESCRIPTION OF MECHANISM
A mechanism is any system of parts that
operate and function properly. To
describe a mechanism, organism, system
or site, make sure that you are clear
about your viewpoint on the subject and
make the viewpoint clear to the readers,
its function, its physical characteristics
and its parts.
(cont.)
8. REMINDER
1. description of a mechanism almost
never constitutes an entire report by
itself
2. what needs to be said in the
description always depends on what
the readers needs to know
10. WHEN THE READER COMES TO A DISCUSSION OF
A MECHANISM UNFAMILIAR TO HIM, HE ASK FOR
THIS KIND OF INFORMATION.
1.What is it?
2.What its purpose is?
3.What it looks like?
11. Mechanism Description
Introduction
◦Define the mechanism with a technical definition
and add extensions necessary for the reader to
understand the discussion.
◦Describe the mechanism’s overall function or
purpose.
◦Describe the mechanism’s overall appearance
◦List the mechanism’s parts in the order in which
they will be described.
13. Mechanism Description (2)
Discussion
◦Define first part with a technical definition.
◦Describe the part’s overall function or purpose.
◦Describe the part’s shape, material, etc.
◦Transition to the next part.
14. ASPECTS OF MECHANISM
▪ Shape
▪ Size
▪ Relationship to other parts
▪ Methods of attachments
▪ Material
▪ Finish
15. The 33-kilohm, 1-watt carbon resistor is a circuit component that
impedes the flow of electric current.
The resistor impedes the movement of electrons, thereby
generating a thermal response depending on temperature, cross section,
and length of the resistive element. The resulting resistance …
The carbon element is the capsule of resistive material that coverts
electrical energy into heat. The carbon element serves as the primary
active…
The carbon element is cylindrically shaped and is 2.4 cm long with
a diameter of .32 cm. It is composed of finely ground carbon particles
mixed with a ceramic binding compound.
The 33-kilohm 1-watt carbon resistor is a circuit component that
impedes the flow of electric current through the use of a carbon element.
The resistor is made up of four parts: the carbon element, …
Together, these parts form one of the most commonly used circuit
components in electronic systems today.
18. A is a meteorological instrument used for the measurement of
atmospheric pressure. may be classified into two general types, depending
on the ways in which they record the pressure of the atmosphere. The
is the larger and more accurate of the two types, while the
is more compact but less accurate.
The is a portable meteorological instrument designed to
record changes in atmospheric pressure. It consists of a thin hermetically-sealed
cylindrical metal box, exhausted of air so that the ends of the box tend to approach or
recede from one another with change in the pressure of the atmosphere. A train of
levers within the box magnifies this movement and records it by an index arm moving
over a scale that is graduated to give barometric pressure in feet and inches of mercury.
The is a meteorological instrument used for measuring the
pressure of the atmosphere in terms of the height of a column of mercury which exerts
an equal pressure. In its simplest form the mercury barometer consists of a vertical
glass tube about 180 cm. long, closed at the top and open at the lower end which is
immersed in mercury in a dish. The tube contains no air; rather it contains a vacuum.
20. A Mechanism Description
The Mechanism – a 33-kilohm resistor
◦The 33-kilohm, 1-watt carbon resistor is a circuit
component that impedes the flow of electric
current.
◦The resistor impedes the movement of electrons,
thereby generating a thermal response depending
on temperature, cross section, and length of the
resistive element. The resulting resistance …
21. The Part-by-part Description
The resistor consists of the following parts: the carbon
element, the wire leads, the casing, and the color bands.
The Part Description
◦ The carbon element is the capsule of resistive material that coverts
electrical energy into heat. The carbon element serves as the
primary active…
◦ The carbon element is cylindrically shaped and is 2.4 cm long with a
diameter of .32 cm. It is composed of finely ground carbon particles
mixed with a ceramic binding compound.
22. The Conclusion
◦The 33-kilohm 1-watt carbon resistor is a circuit
component that impedes the flow of electric
current through the use of a carbon element.
The resistor is made up of four parts: the carbon
element, …
◦Together, these parts form one of the most
commonly used circuit components in electronic
systems today.
23. The 33-kilohm, 1-watt carbon resistor is a circuit component that
impedes the flow of electric current.
The resistor impedes the movement of electrons, thereby
generating a thermal response depending on temperature, cross section,
and length of the resistive element. The resulting resistance …
The carbon element is the capsule of resistive material that coverts
electrical energy into heat. The carbon element serves as the primary
active…
The carbon element is cylindrically shaped and is 2.4 cm long with
a diameter of .32 cm. It is composed of finely ground carbon particles
mixed with a ceramic binding compound.
The 33-kilohm 1-watt carbon resistor is a circuit component that
impedes the flow of electric current through the use of a carbon element.
The resistor is made up of four parts: the carbon element, …
Together, these parts form one of the most commonly used circuit
components in electronic systems today.
24. Mechanism Description focus
A mechanism descriptions’ primary focus is on the physical characteristics or attributes of the
device and its parts.
Thus they tell the size, shape, color, finish, fit, etc. for the complete mechanism and its for each
of its parts.
Descriptions typically include figures, diagrams, or photographs.
