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EngineerDrawings/GDT

ISAT 211

QuestionAnswer
What characteristics must drawings have? They must be clear, complete, and accurate
Layout Drawing A pure geometric representation of an entire assembly prepared in initial design stages to resolve spatial issues and tradeoffs without full attention to dimensioning or presentation
Detail Drawing Supplies complete details for making a single part including its shape and size descriptions, material call-out and specifications of tolerance and surface finish
Assembly Drawing Depicts assemblies of fully detailed component parts, arranged as they appear in the final assembly
What does the title block include? The part number, its revision and title or description, the name of the company, scale if any, and default values for tolerance and surface finish
What lines define basic geometric form? Visible lines, hidden lines, center lines
What lines associate with dimensions Extension lines, dimension lines
What lines are pointing and advisory Leader lines, break lines, cutting plane and section lines,
What is the process of creating drawings? Create drawings with geometric models in a CAD database. Extract 2D views of the part and place it in a blank drawing. The views are dimensioned, toleranced, and customized, and identify descriptive information
What does pictoral projection mean? It's isometric, oblique and perspective useful for general illustrations
What is an orthographic Projection? Images of an object that are projected onto planes as they appear to the eye when viewed from three orthogonal (mutually perpendicular) directions.
What are the basic rules for placing linear dimensions? Place dimensions between views when possible. Place smallest nearest the view being dimensioned. Dimension the view that best shows shape
Concentric cylindrical features Best shown in a side view
One-View drawings Use symbol θ (metric) or the abbreviation DIA(inch)
Circular arc Dimensioned via its radius
Cylindrical holes Dimensioned with a leader pointing to the hole and the diameter is preceded by θ or followed with DIA
Circular Tapers Find: the diameter of one end of the taper, length of the taper, inclination rate, and taper ratio
Flat tapers Dimensioned in a fashion similar to circular tapers
Chamfers Dimensioned via their length and angle
Undercuts Dimensioned with a note specifying width followed by the diameter
Coordinate Dimensioning System Define distance, location and size by means of linear dimensions measured from reference axes or datum planes
True Position Dimensioning Features defined in terms of their most likely or mean position
Polar Coordinate Dimensioning Define position by means of a radius and an angle
Chain and Datum dimensioning dimensioning of features sequentially in a chain-like manner or from a common reference (datum) point or a line.
Geometric Tolerance The maximum permissible variation in form, orientation or location of a feature from specifications on the drawing
4 Vital requirements that GDT meets with a quality drawing Complete, Functional, Maximum Tolerance, and clear
Where is third angle projection used The US, Canada, Japan
Where is first angle projection used? Mainly in Europe and some Pacific Rim countries
What is a cutting plane Its represented by its edge which is shown in a view perpendicular to the cutting plane itself.
What is Rounout The deviation in position of a surface of revolution about a give (datum) axis
Straightness A geometric characteristic of lines and line elements of surfaces
Flatness A condition in which all surface elements lie on the same plane
Created by: hgspork93
 

 



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