Assignment D5

 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

 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

 Highlight everything (Ctrl-A)  The pick Show Constraints from the ribbon

 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

 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

 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

 Notice at the bottom of the screen inventor tells you that you need more dimensions to completely define the triangle

 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

 Select the Vertical Constraint Icon  Pick the inclined line on the right and watch what happens

 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

 Add the lock constraint to the bottom right corner  The angle dimension to the bottom left angle  You drawing should now say FULLY CONSTRAINED

 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

 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 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

 Draw a circle inside the triangle of arbitrary size

 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