PLTW Engineering course review
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56 Terms
Steps of Design Process 1-6
Define Problem, Generate Concepts, Develop Solution, Contruct and Test, Evaluate Solution
What step uses the Decision Matrix
Step 3
Concept Sketching
is quick!!!!
Precision
how close two values are to each other
accuarcy
how close a measurement is to the true or accepted value
Scale
Specify a percentage of original size to enlarge or reduce the size of an object.
Multiview Drawings
used to communicate objets precise details
Orthographic Projection
is used as: line projection
Construction lines
thin lines that guide drawings
Object lines
A heavy solid line used on a drawing to represent the outline of an object.
Hidden Lines
used to represent features that cannot be seen in the current view
Centerline
Imaginary line running from ship's bow to stern
Center line
broken line
Cutting Plane Line
Indicates the location of imaginary cut made to reveal interiors.
Section Lines
only happens when its a solid
Through Holes
drill exits opposite side of work
Blind Holes
drill does not exit work on opposite side
Product Variation consist of-
the difference btwn objects and other objects of the same type
Tolerance
specifically acceptable amount of variation or error in a physical type
Limit Dimension
provides upper and lower limits for dimension
Allowances Types
Clearance, Interface, Transition
Clearance Fit
limits the size of mating parts so that a clearance or space always results when mating parts are assembled.
Interface Fit
fastening between two apts which is achieved by friction after they are pushed together.
Transition Fit
Occurs when two mating parts can sometimes have a clearance fit and sometimes have an interference fit.
Two different Bilateral Tolerances are
Equal and unequal
Three types of tolerances are
unilateral, bilateral, limit dimensions
Human Centered Design
creative problem-solving process that focuses on designing from the perspective of people you are trying to reach
Product Life Cycle Step 1
Raw Materials
Product Life Cycle Step 2
Material Processing
Product Life Cycle Step 3
Manufacturing
Product Life Cycle Step 4
Packaging
Product Life Cycle Step Step 5
Distribution
Product Life Cycle Step Step 6
Utilization
Product Life Cycle Step 7
Disposal
Phases of Human centered design
Inspiration, Ideation, Implementation
What three dimensions do isometric sketches show?
Width, height, length
[Blank] is what you use to help make decisions.
Decision Matrix
This kind of tolerance allows movement equally in two directions.
Equal Bilateral
This kind of tolerance allows movement in two directions.
Unequal Bilateral
This kind of tolerance states the upper and lower limits of a dimension.
Limit Dimension
An interference fit ___
allows no space between a rod and hole
A clearance fit ___
maintains space between a rod and hole
.
An transition fit ___
sometimes maintains space and sometimes allows no space between a rod and hole
What are the three parts of a black box systems model?
Inputs
Function
Output
What unit of measure are our dial calipers in?
Inches
How many steps are in the design process?
6
I have a scale that says my 50 lb dumbbell weighs 47 lbs every time I weigh it. My scale is...
Precise
I have a scale that says my 50 lb dumbbell weighs 50 lbs every time I weigh it. My scale is...
Precise and Accurate
I have a scale that says my 50 lb dumbbell weighs 47 lbs one time and 52 lbs the next. My scale is...
None.
best front view?
longest face
most details
least hidden lines
most features
Note 
Flashcards (81)