Learn how add dimensions.
- [Instructor] In this movie we're going to be creating general dimensions for this part you see on the screen. So, there's a couple of different methods for creating dimensions, but we're going to be using the main dimensioning command here, which is the Smart Dimension. Now directly below that you have a couple of different options. Down here you can choose either a horizontal dimension or a vertical dimension, or baseline, or ordinante, and so on, but the Smart Dimension pretty much figures all of that out for you, and chooses the right dimension based upon where you place it in context. So go ahead and choose Smart Dimension, and over here we're going to go ahead and choose maybe from one side of the part, so I'm going to click on this face right here and come all the way over to the other side of the part and click, and that's going to allow me to place the overall dimension.
Pretty straight forward and easy there. Same thing over here, if I want to chose maybe from the bottom of the part up here to this top surface, go ahead and place a dimension here, and there it is. Now you can also dimension holes, I would recommend adding some center marks to your holes first. So go ahead and hit escape to get out of the dimensioning tool, and then head over here to the Center Mark tool. Click on that one there. Click on one of these holes. And thus it adds a little bit of these extension lines. I don't really like seeing extension lines, so you might want to turn those off.
So I'll go ahead and turn the defaults off, turn extension lines off, and then that looks a little bit better. Once you already have the selections made, you can then choose the individual holes and arcs you might want to add a center line to, it makes it a little bit easier. Click OK when you are done. And now we can easily add dimensions to those individual holes. So over here you might what to make a dimension from the surface here over to a hole, right? And notice we're kind of choosing this line over here as our first data mark. Everything pretty much wants to be established from that edge, right? Or from that edge and then another dimension.
So, you could dimension here from this edge here over here to this next hole, if you wanted to, and that would be one way to add a dimension. But maybe a more relevant dimension might be to delete this one here and then add a dimension from this hole here over to this next hole over here, and then place a dimension. That way you can hold the hole to hole dimension a little bit tighter. And then from the edge to the first hole, can be relaxed a little bit. So right now we've got a three place decimal here. Let's change that over to a two place decimal.
So it gives a plus or minus 10, per the block. And then over here, we're going to keep a three place decimal from hole to hole. So those are a couple of pretty good ways to dimension your part. Same thing if we go over here, we add a dimension, we can dimension from here up to this first hole. Place a dimension. Now we can continue doing that from that bottom edge to each one of these holes, which is a pretty fine way to do this, but we also have the ability to, instead of going from one to the next, we can also dimension from hole to hole. So I can say from the overall distance here.
Maybe the overall distance here. Something like that may be more important. And then when you already have these dimensions, like this one here, you notice these kind of work together. So I'm saying it's a distance of .950 to the first hole and then it's .6 between them. Over here same thing. From the edge to that first hole is .350 and then we've got 1.8 between them. And then go ahead and delete this one here. We don't need that one. Everything looks pretty good. Or instead of that, you might want to say, and delete this all together here.
And what you might say is something like, from the first hole to the edge is .350, right? So then maybe from the first hole to the second hole might be the .6. And then you might continue that .6 dimension. It really depends on what is important in your design. If the hole to hole spacing is very important from one hole to the next, it's more important to add something like this. If the hole to edge spacing is more important, it's better to add the dimension to the bottom of the part here, up to the hole. So it really depends on how you want to add dimensions to your drawing, and what features are really important, and what they're relative to.
But in general you want to choose some type of starting line or a baseline to your drawing, that pretty much everything comes from. In this case, we're choosing this left edge here and we're choosing this bottom edge here, as our baselines for our dimensioning scheme. Alright, we can continue adding more and more dimensions over here just by clicking and jumping back to that tool. Sometimes when you have a dimension like an angle, I can dimension from over here and add dimension or an angle here. But maybe you want a dimension up to where virtual point is.
So if you don't have a point there, you might need to go add something in. And you can easily add that by going over here to Sketch. And what I'm going to do is select this line here, hold down Control, select this other line right here, and then come up here and click on the Point command. Notice it automatically extends these lines to their virtual sharp. And what that allows me to do is add a dimension from the bottom to the virtual point. And now you know exactly where that virtual sharp might be. And you can continue adding dimensions.
Like maybe the radius there, and so on. If you click on this little dot it switches the dimension to the outside versus the inside, so it might look a little bit cleaner. You also have the option to change the way the leaders look. You can click on one of these arrows over here to change the way that looks to get a little bit cleaner look, depending on what you're working on. In this case here you might want to do something like this. May look a little bit cleaner. Or you can switch to something else, like this one or this one. So this last one here looks that best to me. You don't have a lot of extra lines and you're basically just showing what the radius is for that edge.
Now of course we do need to add the rest of the dimensions, but before we do that, let's go ahead and add a couple of extra views. So over here, if I select this view here, come over here to View Layout. Come over here to Projected View, I'm going to go ahead and place a view right here over to the right, and then one directly above. Alright? So now whenever you have multiple views you generally want to continue to use the same data points that you did before. For instance, if you come over here to Annotation, Smart Dimension, I want to make a dimension from this edge, which is the same edge we used down here, to this hole.
Would it be okay to add a dimension from this side to the hole? So yes it's okay. And if there's really a critical dimension that you did specify to that far edge, that would probably be acceptable. However, in a general dimensioning scheme it's always best to dimension from the original data surface over here, to that first hole. Place a dimension. Should be all set. And then maybe another one here from that bottom edge to the hole ... Let me just try that one more time, it automatically grabbed something else.
From that edge over here place a dimension, and now we've got a couple dimensions to that hole. Now if you want to actually place a hole dimension, we also have the ability to add a Hole Callout. Click on the Hole Callout. Click on the hole itself, and then drag out that dimension. And notice it gives you the through hole size, the depth, the style of tap, as well as a counter sink for that hole. So you can get a lot of information by using that Hole Callout on your drawing. Hopefully this gives you a pretty good understanding of how to add individual dimensions to your drawings. There's quite a few different options there, but they're all pretty straight forward and easy to use.
And we'll be continuing to learn about the different dimensioning schemes as we go through this chapter.
First, see how to how to use the sketch tools to create two-dimensional sketches that become the foundation for 3D objects. Next, look at extruding and revolving 3D features; creating complex objects using the Sweep, Loft, and Surface tools; and modifying parts. Learn how to create uniform holes with the Hole Wizard, and explore more advanced modeling techniques using equations, mirroring, and pattern tools. Then review best practices for putting parts together in assemblies and building robust structures. The course wraps up tips for creating detailed drawings that relate the final parts and assemblies to a manufacturer, complete with an itemized bill of materials and drawing notes.
- Working with templates
- Creating sketches
- Extruding and revolving features
- Applying materials
- Sketching lines, shapes, and polygons
- Trimming, extending, and transforming geometry
- Adding fillets and chamfers
- Working with planes and coordinates
- Creating patterns
- Modeling advanced parts
- Making holes
- Designing with blocks
- Building assemblies
- Mating parts
- Linking sketches
- Using design tables
- Creating part and assembly drawings
- Creating dimensions
- Adding annotations