Finals Study Guide Flashcards
The mental representation and manipulation of two and three dimensional objects.
spatial visualization
A form of pictorial representation or graphical model in which all dimensions parallel to the three principal spatial axes are shown in their true proportions.
Isometric Sketching
The ratio or relationship between a distance or area on a map and the corresponding distance or area on the ground, commonly expressed as a fraction or ratio.
Scale
Also known as solid modeling. The process of creating a solid model or three-dimensional object using a modeling and design application on a computer.
3D Modeling
A solid modeling technique where geometry is subtracted from existing model geometry.
Subtractive
A solid modeling technique where geometry is added to existing model geometry.
Additive
What is the acceptable amount of dimensional variation that will still allow an object to function correctly?
Tolerance
_____________________ provides an allowable variation in only one direction.
Unilateral Tolerance
______________ permits variation in both directions from the specified dimension.
Bilateral Tolerance
________________ provides an upper and lower limit for the dimension of a part.
Limit Dimension
+.004 -0.00 is an example of a ______ tolerance.
Unilateral
+ or - 0.03 is an example of a ______ tolerance.
Bilateral
.505 .495 is an example of a ______ dimension.
Limit
What would the upper and lower limits be for the following bilateral tolerance? (1.50 +/- .05)
1.45-1.55 inches
Identical components that can be substituted for one another, particularly important in the history of manufacturing. As precision instrumentation became available, large numbers of identical parts could be produced at lower overall cost.
Interchangeable Parts
Two areas of one or more parts that contact each other. The areas may be flanges, edges, aligned holes, or similar features.
Mating
A manufacturing method used for rapid prototyping where three-dimensional objects are built by adding layer upon layer of material.
Additive
The tightest possible fit between two mating parts.
Allowance
Limits the size of mating parts so that a clearance or space always results when mating parts are assembled.
Clearance Fit
The fastening between two parts which is achieved by friction after the parts are pushed together, rather than by any other means of fastening.
Interference Fit
Occurs when two mating parts can sometimes have a clearance fit and sometimes have an interference fit.
Transition Fit
Removes all degrees of freedom between 2 entities.
Fastened Mate
Allows rotation about the z-axis.
Revolute Mate
Allows translation about the z-axis.
Slider Mate
Allows translation along the x and y axes and rotation along the z.
Planar Mate
Allows translation and rotation about the z-axis.
Cylindrical Mate
Use relief cuts when cutting tight curves as needed.
True
The blade guard should extend only about a 1/4 to 1/2 inch above the material being cut.
True
Safety glasses are optional when using the band saw.
False
Loose clothing, long hair, and lanyards should be tucked away before use.
True
Hands, fingers and/or any other body part should not be inline and/or within 2 inches of the blade.
True
Press hard as the blade is about to exit the material being cut.
False
Concentrate on what you are doing while using the bandsaw.
True
If the blade brakes, allow the saw to keep running.
False
Be sure to clear loose material or scrap off the bandsaw table before and after each use.
True
It’s ok to leave the band saw running when you are done as long as no one is around.
False
A process that repeats a series of steps over and over until the desired outcome is obtained.
Iterative
Making the best or most effective use of resources to get the best possible solution.
Optimization
A standard, rule, or test by which something can be judged.
Criteria
An average of a set of numeric data values. It is calculated by taking the sum of individual values divided by the number of individuals.
Mean
__________________ design criteria should provide a precise indicator of a quantifiable characteristic so that a design can be compared to the criteria and deemed acceptable or unacceptable.
Measurable
A person who is trained in and uses technological and scientific knowledge to solve practical problems.
Engineer
An extreme value that differs greatly from other values in a set of data.
Outlier
The set of output values of a function.
Range
Step 1 of the Engineering Design Process
Define the Problem
Step 2 of the Engineering Design Process
Generate Concepts
Step 3 of the Engineering Design Process
Develop Solution
Step 4 of the Engineering Design Process
Construct and Test
Step 5 of the Engineering Design Process
Evaluate Solutions
Step 6 of the Engineering Design Process
Present Solution
