Week 2 Day 1

Workshop by

Highlights of Previous Lecture

• What is CAD and its advantages?

• Introduction to Pro/ENGINEER and its environment

• Introduction to Sketch mode and its tools

Today’s Lecture

• Dimensions– Definition

– Weak Dimensions

– Strong Dimensions

– How to use Dimensions to give a required shape

• Constraints– Definition

– Types of Constraints

• Practicing Dimensions and Constraints

Dimensions

• Definition

– Measurement of entities

• Length

• Radius, Diameter

• Angles

Weak vs. Strong Dimensions

• Weak Dimensions– Are grey in color

– made automatically by the software

– Can be modified by dragging the edges of shape(s)

• Strong Dimensions– Are in white color

– Have to be entered manually

– Locks the shape, i.e. the feature cannot be dragged to change

Dimensioning a Shape

• Draw a rectangle, randomly of any size

• Now we want to make its size

• Double click the weak dimensions

– They will become editable

– Enter the desired values

Radius & Diameter Dimensions

• To this rectangle, add Fillet of dimension 3 units

– Fillet measuring dimension is Radius

• Now add a circle at the center of this shape of diameter 5 units or radius 2.5 units

Angular Dimensions

• Draw 2 lines of any dimensions, both meeting at one point

• Click the Dimension tool

• Select the two lines

• Now click the MMB between these lines

Constraints

• Definition

– A limitation or restriction

• Why they are used?

– To give our drawings a definite shape

• Types

– Horizontal, Vertical, Perpendicular, Tangent, Equal Parallel, Symmetric

Using Constraints

• Click the constraint icon

• pops-up a window, with title “Constraints”

• Draw different shapes and apply them

• Represented by letters and symbols

Horizontal Constraint

• Makes any line horizontal

• Represented by letter “H”

Horizontal constraint

Vertical Constraint

• Makes any line vertical

• Represented by letter “V”

Vertical constraint

Parallel Constraint

• Makes two line Parallel to each other

• Represented by the symbol “//”

Parallel constraint

Perpendicular Constraint

• Makes two lines perpendicular to each other

• Also called “Orthogonal” constraint

Perpendicular constraint

Equal Constraint

• Makes two entities equal to each other

• Applied to radius (R), diameter, length (L), angles measurement

Equal constraint

Tangential Constraint

• Makes a point tangent to the curve

• Represented by letter “T”

Tangential constraint

Applying Constraints

• Equilateral Triangle

• Isosceles Triangle

Equilateral Triangle

Isosceles Triangle

Practice Drawing 1

Practice Drawing 2