philosophy of modeling

# Philosophy of - Solid Edge Modeling Philosophy 1 Learning Objectives What is a solid modeling package(Solid Edge SolidWorks really How are things

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Solid Edge - Modeling Philosophy Learning Objectives What is a solid modeling package (Solid Edge, SolidWorks) really? How are things organized within a solid modeling package? Are there general guidelines for building robust models? 1

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Solid Edge - Modeling Philosophy Solid modeling software Solid modeling software appears to be graphics software. It is really data base software that manages graphic elements. Each element in the database has certain characteristics that define the element A line has - a start point - an end point - an equation that locates all points between the start and end points A circle has - a center - a radius - an equation that locates all points on the circumference To display a graphic element, the software simply displays the solution to the equation for each element in the data base. Geometrical relationships apply constraints to the solutions so that the solution of one equation is related to the solution of another. Dimensions are another type of constraint linking the solutions to the equations. 2
Solid Edge - Modeling Philosophy Solid model hierarchy Sketch primitive A graphical entity (a point , line , arc , circle , ellipse , curve , etc.) in a sketch. A sketch primitive is described internally by the equation appropriate to the shape. - e.g., the equation of a straight line, circle, etc. Sketch primitives are constrained by their - shape (or the equation that represents the shape) - size - size may be determined by dimensions and/or geometrical relationships - geometrical relationships to other entities An unconstrained entity is one for which there are neither dimensions nor geometrical relationships that position and size the entity relative to either other entities or the global coordinate system. A fully constrained entity is one for which the combination of applied dimensions and geometrical relationships completely locate and size the entity. 3

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Solid model hierarchy (cont.) A sketch is a set of sketch primitives (points, lines, arcs, circles, ellipses, curves, etc.) which are all placed on a common plane Sketch primitives (entities) are defined by their shape geometrical relationships to other entities dimensions An entity with neither dimensions nor geometrical relations to other entities is unconstrained A fully constrained sketch is a sketch in which all the entities are completely constrained (located and sized) by the set of shapes, geometrical relationships, and dimensions placed on the sketch A profile is a sketch used to create a feature Profiles are planar The profile shows the feature in cross-section Non-construction lines in the sketch represent the projection of feature surfaces onto the cross-sectional plane. 4
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## This note was uploaded on 04/28/2008 for the course AME 308 taught by Professor Shiflett during the Spring '07 term at USC.

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Philosophy of - Solid Edge Modeling Philosophy 1 Learning Objectives What is a solid modeling package(Solid Edge SolidWorks really How are things

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