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GC 120 Final
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Gravity
Terms in this set (63)
Standards
sets of rules that govern how technical drawings are represented
Conventions
commonly accepted rules, methods and practices
Precedence of lines
Visible > hidden > center lines
CSG Modeling
allows modelers to create a complex surface or object by using boolean operations to combine objects.
Boolean Operations
Union, difference, intersection
B-Rep Modeling
method for representing shapes using the limits (faces, edges, vertices)
Orthographic projection theory
plane of projection is positioned between the observer and the object, and is perpendicular to parallel lines of sight
Parallel projection types
orthographic, top, front, side, oblique, cavalier, cabinet
Perspective projection types
one point, two point, three point
Principle planes of projection
top, bottom, front, rear, left and right
5 types of planar surfaces
Horizontal, frontal, profile, oblique, inclined surfaces
Standard projection theory
USA
third angle
criteria for front view
longest side or have most feature that can be used to identify. Most detail and largest quantity of visual features
Free hand
rough sketch
contour sketching
only sketch the boundaries
negative space
space between object
standard font size
3mm or 1/8inch gothic single stroke font
title block
drawing name, company name, relationship to other drawings, dimensions, etc.
bill of materials
part numbers, part names, materials, part quantities
third angle projection
dimetric, trimetric, isometric
A-Size sheet
8.5X11
Graphics theory consist of
geometry and projection techniques
technologists
practical aspects of engineering
engineers
design products, systems and devices to improve daily life
Design process
Visualization, communication, documentation
shape description
objects geometric position in space
what defines a plane?
three points, two parallel lines, a line and a point
isometric
all equal angles
dimetric
two angles equal
trimetric
no angles equal
Visualization
Graphics help to mentally picture things that do not exist.
Communication
Graphics act as a means for others to clearly understand design ideas.
Documentation
Graphics can be used to permanently record design ideas
Production Manager
responsible for the design of the team
Linear design process
sequential process
Concurrent Process
includes ideation, refinement and implementation
mechanical sketching
involves precision instruments and is more in depth than freehand. Not shown to marketing professionals
Illustrations
very in-depth and realistic looking. Shown to non-technical professionals
Polar coordinate system
one angle and one distance
Cylindrical coordinate system
one angel, two distances
Spherical coordinate system
two angles, one distance
Cartesian Coordinate system
x, y and z axis
right hand rule
thumb is Z, pointer finger is X, middle finger is Y
chord
a line segment on any curve that joins two points
implicit constraints
implied by the explicit constraint. Dimensions give shape
Explicit constraints
constraints given outright that describe an objects shape and size.
Global/world coordinate systems
based on primary projection planes (Big XYZ axis)
local/relative coordinate systems
based on objects geometry as a reference (little xyz axis)
CB modeling
modeling that is a series of modifiable features, linked or not linked to one another.
Swept boss/base and Swept cut
two types of sweeps that follow path and create desired, complex object shape
Solid model
model consisting of volumetric information, as well as surface information
Manifold model
models that unambiguously define a boundary between the inside and outside of an object
primitive model
basic shape models
feature
general term in the physical part that serves as a function either in manufacture or application (hole, slot, stud)
10 mm from object, 6mm from each other
How should Dimension lines be placed?
counterbore
Countersink
Spot faced
blind hole
threaded hole
O .25 - 20 UNC 2B
Working drawing
a set of standard drawings specifying assembly of a product based on its design. (detail drawings, assembly drawings, a bill of materials and standard title block)
Depth, height and width view
Types of Auxiliary views
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