# Understanding relationship types

## Video: Understanding relationship types

Let's talk about the various relationships and how they can help us to sketch better.

## Understanding relationship types

Let's talk about the various relationships and how they can help us to sketch better. I have open a sketch on the top plane here with a rectangle with four holes in it. And it's a fully defined sketch and it is the correct size and the correct location. However, there's a lot of extra work here that we probably can save ourselves a lot of time. So let's point a few things out that probably, we could improve if we use some relationships instead of all these dimensions. Let's go ahead and count all the one inch dimensions. We've got, like, one, two, three, four, five, six, seven, eight, nine, ten, 11, 12 times we're using the same one inch dimension.

That's a lot. So general rule of thumb is if we use the same dimension more than once, it's too many times. So, let's go through here and see if we can replace some of these dimensions, with relationships to simplify the design. And now notice, these are all the same size hole. So instead of dimensioning all four of them, let's go ahead and delete these dimensions. One, two, and three. And let's leave one of those. You can leave any one of them. It doesn't matter. Let's choose the first one, hold in Ctrl, and let's pick all four of those circles. And since you let go of that, let's go ahead and choose, make Equal, or you can choose it from down here.

So, again, super, simplifying the design, by changing one of the dimensions, now changes all four. For instance, if I change this to 0.5, all the holes automatically change. If otherwise if I had them all individually dimensioned, if I changed one, I'd have to go ahead and change all four of them. And like most designs they change rapidly. So you don't have to go back and do four times as much work, when you can easily just change one and they'll all automatically update. It also makes it a lot simpler, when you're making changes and less chances of error. Let's go back and change that to one, 1.0. Okay. Next.

Let's take a look at all these other dimensions here. One, one, one, one, one, one, one. They're all the same dimension. Again, maybe we can use some center lines or some other reference geometry to help us out here. So, I'm going to come down here to the Center Line tool, and I make a line from the center point of this one over here to this center point of that one, to the center point of that one. And it's going to say, hey, you can't add that relationship. It's okay, because we're adding all these other lines, it's going to over define our sketch. So if you have that, it's okay, don't worry about it. Click OK. Now I can also go ahead and delete these other dimensions here. So let's go ahead and do that, so delete these.

One, two, three, in fact, I'm going to delete all of these dimensions because, I don't really want any of these dimensions interfering with my sketch. 'Kay? Then I'm going to continue my center line. Just connect the dots from the center point to center point. And then you can see that we've got a nice fully defined sketch. And notice, as I move one, they move them both. Now let's fully define the outside. But now these lines are now blue, so it means they're undefined. So we want to fully define them. So again, I'm going to add one more line. This one is going to be from the upper left hand corner to the lower right hand corner. And I'm going to say, that line, and I'm going to hold down Ctrl and choose the origin.

I'm going to say that's right in the middle, the midpoint. As soon as I do that, now whenever I drag this out, it automatically works as a team. I can move one and move the other ones. And then I can just add a couple dimensions, maybe from this line here, up to here. There's the one inch that way, and I can dimension this way, again one inch that way. As soon as I add those two dimensions with defining it from the outside edges to the top edge, both as one inch everything's defined. If then, later, I want to come back to my design. And say, well, actually that's only a half of an inch. I can change it and everything automatically updates.

So you're saving yourself, instead of eight dimensions, you only have two now. Change it back to one. Here we go. How about these dimensions here, the two, the four, the four, the eight? Let's get rid of all those. Delete, delete, delete, delete. Okay, we can use the same technique we used here with that center line across the middle. Grab the center line. Choose from one corner all the way up to the other one. Grab the origin of the part. Hold down Ctrl, choose the line. Let go of that. Choose Make Midpoint. Now it's defined around the midpoint, so I can drag things around and they all move as a team.

And then just add a couple of dimensions. 8.0, 4.0, and you can see our design is much simpler, it's centered around the origin. And it's very easy to update or change with much less chance for error.

Show transcript

#### This video is part of

SolidWorks 2014 Essential Training

97 video lessons · 6429 viewers

Author

Expand all | Collapse all
1. ### Introduction

1m 51s
1. Welcome
1m 7s
2. Using the exercise files
44s
2. ### 1. Touring the Interface

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. ### 2. Getting Started with 3D

14m 11s
1. Understanding the 3D world
2m 31s
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. ### 3. Basic Solid Modeling

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. ### 4. More Drawing Tools

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. ### 5. Sketch Editing Tools

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
4m 1s
11. Using the Convert Entities command
2m 18s
7. ### 6. Reference Geometry

9m 33s
1. Working with planes
5m 28s
2. Placing and using axes
2m 22s
3. Placing a coordinate system
1m 43s
8. ### 7. Building 3D Geometry

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. ### 8. Removing Material

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. ### 9. Refining Geometry

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. ### 10. Blocks

9m 39s
1. Working with reusable sketches and blocks
2m 47s
2. Creating blocks
3m 51s
3. Designing with blocks
3m 1s
12. ### 11. Assembly: Putting It All Together

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
3m 32s
7. Using Toolbox
4m 21s

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. ### 13. Hole Wizard

10m 20s
1. Getting started with the Hole Wizard
4m 38s
2. Positioning holes in layout sketches
5m 42s
15. ### 14. In-Context Modeling

15m 27s
1. Linking sketches to other parts
4m 28s
6m 48s
3. Using the Hole Wizard in context
4m 11s
16. ### 15. Creating Threads on Parts

17m 15s
7m 17s
2. Using a helix and Swept Path to create a thread
4m 2s
5m 56s
17. ### 16. Equations and Design Tables

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. ### 17. Part Drawings

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. ### 18. Dimensioning

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. ### 19. Adding General Annotations

14m 38s
1. Creating holes and callouts
5m 8s
2. Adding center marks and centerlines to a drawing
3m 46s
2m 57s
4. Making drawing revisions
2m 47s
21. ### 20. Assembly Drawings

11m 42s
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. ### Conclusion

1m 2s
1. Next steps
1m 2s

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