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Using construction lines to build robust sketches

From: SolidWorks 2014 Essential Training

Video: Using construction lines to build robust sketches

Effective use of construction lines in Construction Geometry is

Using construction lines to build robust sketches

Effective use of construction lines in Construction Geometry is the key to being an efficient and effective designer. Many times, sketches can be fully defined without even a single dimension. By tying your sketch entries into existing geometry, we can build powerful sketches that are dynamic. Let's consider the case of 2 holes that need to be equally distant from the center line of a part. Let's take a look at what to do. So in this case here, I can go in and take a look at the feature itself, and below that is the sketch. Let's go ahead and edit that sketch and take a look. Okay, what we have here is a under-defined sketch.

And I want to place a hole about here and a hole about there. So I could Start off with a hole, I could place the hole here, and maybe come over here and place another hole. And then what I could do is maybe add a dimension here and tie it into the side, maybe we'll say one inch there. And we do the same thing over here, again one inch. And of course, we want to do the same thing over here again. Click from here to here. Okay, one inch, and then of course, we could dimension these things one inch there, and maybe one inch there. So what happens here is if I move the outside sketch here, those follow along.

That's okay. Move it over here. You know, they are equally distant from the center line and everything looks okay, except, you know we're adding a lot of the same dimension over and over again. And it doesn't really look that great. And what if we really wanted this hole to be in the center between this line and this line? Then, it makes it a little more complicated. So let's look at how to do this correctly the first time. So what I'm going to do, is I'm going to go ahead and just delete all that. You can delete all those dimensions as well. And we'll start with a little bit better methodology. First off, I'll start with the center line. So from the center point of this or from the origin, I can choose a line from here.

In fact I can make actually 2 lines, containing the second line all the way up to the top. Now I've got 2 lines here and you can see I have a point between the 2. And I say hey this line here, hold on Ctrl. Select this line here and say well let's make these equal. Then what I can do is make another line here. Just bring it across here. And I could make that point this point here, and that line, hold down control, make a midpoint. Now I've got a line that's midpoint in the center there, so if I move things up and down, it's all moving parametrically. I'm doing all this before I've even added the holes. Now I can grab a hole, or a circle.

Drag the circles out. Might as well make them equal. And now you have a much more robust design. Now all you need to do is add maybe one dimension from here to here. We just type in the same one inch dimension and it controls both sides and anything I move in the design will automatically update. If I move things around here, it'll automatically update as well. Makes it a more parametric design that's linked to other items. In fact if I wanted to, I could delete this altogether. Maybe what you'd like to have is this hole in the middle of. This little tab. In this case here, I can say well, why don't I snap to the midpoint, and snap to the midpoint of the hole, and then make this line here vertical.

Now when I drag this out, it's automatically always in the middle of that tab. I drag it up again, always in the middle of the tab. So very robust design, and you can see, you don't even have one dimension here. Locating where these holes are. The only dimension you might want to add is the size of the hole. Make it one inch. Add a few other dimensions to the size of the actual part, but we had to have to put that in anyways. When you're happy with what you have, save out the sketch, and you've got a more dynamic, robust part, using construction geometry and center lines.

Building good construction geometry is the single best way to make better sketches, and to leverage the power of the parametric capabilities of SolidWorks. Always try to think through how your sketch will behave and try to minimize the excess dimensions.

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This video is part of

Image for SolidWorks 2014 Essential Training
SolidWorks 2014 Essential Training

97 video lessons · 9012 viewers

Gabriel Corbett
Author

 
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  1. 1m 51s
    1. Welcome
      1m 7s
    2. Using the exercise files
      44s
  2. 31m 13s
    1. Launching SolidWorks for the first time
      3m 55s
    2. Accessing and customizing the Ribbon
      4m 14s
    3. Touring the shortcut bar and identifying essential keys
      7m 27s
    4. Saving, renaming, and managing files
      10m 28s
    5. Working with the new view cube, or View Selector
      2m 36s
    6. New features in SolidWorks 2013 and 2014
      2m 33s
  3. 14m 11s
    1. Understanding the 3D world
      2m 31s
    2. Creating your first part
      3m 15s
    3. The virtual, parametric prototyping environment
      1m 56s
    4. The FeatureManager and feature-based modeling
      3m 43s
    5. History-based modeling and the rollback bar
      2m 46s
  4. 28m 32s
    1. Starting a new sketch
      6m 50s
    2. The six steps used in almost all modeling features
      52s
    3. The Line and Centerline tools
      3m 25s
    4. Using the Circle tool
      1m 51s
    5. Adding and removing relationships and dimensions
      6m 56s
    6. Understanding relationship types
      3m 58s
    7. System options, units, and templates
      4m 40s
  5. 18m 28s
    1. Drawing rectangles
      5m 31s
    2. Creating arcs in a sketch
      4m 8s
    3. Drawing splines in a sketch
      4m 57s
    4. Sketching polygons
      3m 52s
  6. 36m 5s
    1. Trimming and extending portions of a sketch
      3m 54s
    2. Creating offset geometry
      3m 13s
    3. Moving, copying, rotating, and scaling elements
      3m 13s
    4. Erasing, undoing, and redoing actions
      2m 24s
    5. Using the mirror tools
      2m 24s
    6. Creating repeating patterns in a sketch
      4m 55s
    7. Using construction lines to build robust sketches
      3m 25s
    8. Applying fillets and chamfers to a sketch
      2m 32s
    9. Working with slots
      3m 46s
    10. Adding text to parts
      4m 1s
    11. Using the Convert Entities command
      2m 18s
  7. 9m 33s
    1. Working with planes
      5m 28s
    2. Placing and using axes
      2m 22s
    3. Placing a coordinate system
      1m 43s
  8. 17m 50s
    1. Extruding a sketch into a 3D object
      4m 36s
    2. Using Revolve to create 3D parts
      2m 42s
    3. Using Loft to create complex shapes
      4m 40s
    4. Refining a loft shape with guide curves
      2m 22s
    5. Using the sweep to create wire and pipe shapes
      3m 30s
  9. 20m 23s
    1. Modifying parts using the Extruded Cut tool
      5m 42s
    2. Working with the Revolved Cut tool
      6m 19s
    3. Using the Lofted Cut tool
      3m 32s
    4. Cutting holes and grooves with the Swept Cut tool
      4m 50s
  10. 21m 5s
    1. Using fillets and chamfers to smooth corners
      5m 58s
    2. Creating repeating rectangular patterns
      3m 16s
    3. Creating a circular pattern
      2m 27s
    4. Mirroring objects
      4m 0s
    5. Using the Shell and Draft tools
      3m 52s
    6. Scaling parts
      1m 32s
  11. 9m 39s
    1. Working with reusable sketches and blocks
      2m 47s
    2. Creating blocks
      3m 51s
    3. Designing with blocks
      3m 1s
  12. 29m 45s
    1. Understanding the tools for beginning a new assembly
      4m 46s
    2. The basic steps in creating an assembly
      3m 18s
    3. Mating parts together in an assembly
      6m 43s
    4. Working with subassemblies
      2m 9s
    5. Linear and circular assembly patterns
      4m 56s
    6. Downloading premade parts from the Internet
      3m 32s
    7. Using Toolbox
      4m 21s
  13. 15m 8s
    1. Mating parts with coincident, parallel, and distance mates
      4m 35s
    2. Mating parts with width mates
      5m 53s
    3. Mating parts with path mates
      2m 5s
    4. Mating parts by aligning planes
      2m 35s
  14. 10m 20s
    1. Getting started with the Hole Wizard
      4m 38s
    2. Positioning holes in layout sketches
      5m 42s
  15. 15m 27s
    1. Linking sketches to other parts
      4m 28s
    2. Linking to layout sketches
      6m 48s
    3. Using the Hole Wizard in context
      4m 11s
  16. 17m 15s
    1. Understanding threading concepts
      7m 17s
    2. Using a helix and Swept Path to create a thread
      4m 2s
    3. Understanding internal threads
      5m 56s
  17. 17m 25s
    1. Using equations to drive a sketch
      5m 5s
    2. Working with complex calculations
      2m 6s
    3. Integrating Microsoft Excel to manage design tables
      7m 10s
    4. Building assemblies using part configurations
      3m 4s
  18. 23m 17s
    1. Working with drawing templates
      6m 49s
    2. Setting up drawing options and sheet properties
      3m 43s
    3. Choosing the correct projection angle
      2m 21s
    4. Adding model views to a drawing
      10m 24s
  19. 16m 8s
    1. Creating general dimension notations
      6m 37s
    2. Creating ordinate and running dimensions
      3m 0s
    3. Dimensioning holes and curved features
      3m 8s
    4. Using the autodimension tools
      3m 23s
  20. 14m 38s
    1. Creating holes and callouts
      5m 8s
    2. Adding center marks and centerlines to a drawing
      3m 46s
    3. Adding item notes
      2m 57s
    4. Making drawing revisions
      2m 47s
  21. 11m 42s
    1. Adding assemblies to drawings
      2m 10s
    2. Including a bill of materials
      1m 42s
    3. Adding balloons to specify parts on an assembly drawing
      1m 39s
    4. Adding a title block and sheet properties
      2m 8s
    5. Building an exploded view for an assembly drawing
      4m 3s
  22. 1m 2s
    1. Next steps
      1m 2s

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