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Parametric Constraints. Assignment D5. CONSTRAINTS. There are two types of constraints Dimensional Constraints – You already know how to do Show Size & Location Geometric Constraints – Show relationship between two objects HORIZONTAL, PARALLEL PERPENDICULAR TANGENT - PowerPoint PPT Presentation
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PARAMETRIC CONSTRAINTSAssignment D5
CONSTRAINTS There are two types of constraints
Dimensional Constraints – You already know how to do Show Size & Location
Geometric Constraints – Show relationship between two objects HORIZONTAL, PARALLEL PERPENDICULAR TANGENT
Constraints can be applied manually or automatically
Using Constraints well, will make it easier to change dimensions
DO 1 Make a new
Standard(in).ipt Part
Start a new sketch on the XY plane
Create a triangle of arbitrary size like mine Make sure the bottom is horizontal
First Point
Second Point
Third Point
DO 2 Highlight everything (Ctrl-A)
The pick Show Constraints from the ribbon
CONSTRAINTS There are 12 types of geometric constraints
Coincident – Constraints two points together or one point to a curve
Collinear – Causes two lines or ellipse axes to lie along the same line
Concentric – Constraints two arcs, circles, or ellipses to the same center point
Fix – Constraints points or curves to a fixed location
CONSTRAINTS Parallel – Causes selected lines or ellipse axes to lie parallel to one
another
Perpendicular – Causes selected lines, curves or ellipse axes to lie at right angles to one another
Horizontal – Causes lines, ellipse axes or pairs of points to lie parallel to the X-Axis
Vertical - Causes lines, ellipse axes or pairs of points to lie parallel to the Y-Axis
CONSTRAINTS Tangent – Constraints a curve and line to be tangent to one another
Smooth – Create a curvature condition between a spline and a line, arc or spline.
Symmetric – Constraints two lines or curves to become symmetrically constrained about a selected line.
Equal – Selected arc/circles constrained to the same radius, or lines to the same length
DO 3 Notice at the
bottom of the screen inventor tells you that you need more dimensions to completely define the triangle
DO 4 Create the
bottom dimension as shown, your number will be different that mine, do not change the number to match mine
Notice the number at the very bottom of the screen was lowered
DO 5 Select the Vertical Constraint Icon
Pick the inclined line on the right and watch what happens
DO 6 If you hover your mouse over the
top orange box, you’ll see two Coincident constraints, this is what ties to the lines together to make a loop.
When you can’t make a loop, it’s because these constraints are missing or changed.
If you try to click the orange dot an move it, you’ll only be able to move it up and down, because it MUST be VERTICAL
DO 7 Add the lock
constraint to the bottom right corner
The angle dimension to the bottom left angle
You drawing should now say FULLY CONSTRAINED
OVER CONSTRAINING If you get this box,
that means that the dimension will be DRIVEN
It will have parentheses (0.03) and not be a regular dimension
DO 8 Move your mouse over the
orange block in the lower right corner of the shape
Delete the lock constraint by clicking on it and choose delete, do not clik the little X
Click and drag the top corner of the triangle, and see what happens.
Now click one of the corners and try and move the triangle, it should keep its shape because it’s constrained
AUTO DIMENSION Auto Dimension will help you
create a fully constrained sketch.
After you’ve put in the measurements you know, Auto Dimension will fill in any missing details, and help you see what Inventor is thinking.
Fully Constrained sketches are easier to work with too
DO 9 Draw a circle inside the triangle of
arbitrary size
DO 10 Click the Tangent constraint, then
the inclined line, and the circle
If you click the center point of the circle and try and move it, you’ll se it will change position and size, but it will stay tangent to the line.
Show me this on your screen
Save this as D5.triangle
Ask me for the 4 exercises D5.ex1-D5.ex4