In this video, we'll create a basic sketch. After completing this step, you'll be able to create a sketch, create sketch entities, and edit a sketch. In Fusion 360, we're going to get started with a new untitled document. I want to note that in the browser, the default units are set to millimeters. We're going to change the units to inch and then minimize our document settings. The first thing that I want to do is make a quick save of this document. I'm going to place it in a subfolder called Intro to Sketching and Modeling. Of course, you can place yours wherever you wish, but we're going to call this Sketch Practice. There are a few important aspects to creating new sketches in Fusion 360. We can create new sketches inside of a new component or we can create them without creating a new component, simply sketching at the very top level. Because the best practice is to start with new empty components, we're going to begin by going to "Assemble" and create a new empty component. We're going to call this new component Sketch1, and we'll say "Okay" to begin working inside of that Sketch1 component. If we expand this, you'll note that there is an origin in here, but we have no sketches or bodies. Let's begin sketching by selecting Create Sketch and notice that it automatically displays the origins for us. In order to create a new sketch, we need either a plane or a planer face. Because we have no geometry yet, we need to start with a plane. I'm going to be selecting the default top plane, which is my x-y plane. From here, the Sketch Palette opens up on the right-hand side with various options, and our sketch tools are now visible at the very top in our ribbon. We're going to be exploring a few of the Create options, starting with the line tool. We're going to select the center point or the origin of our sketch by pressing the left mouse button and then moving up vertically. We're going to place the second by left-clicking right around the 2 1/2 inch mark and then we'll use the green checkmark to end our line. I'm going to hit Escape on the keyboard to get off my line tool. Fusion 360 has automatically applied a constraint. A constraint is one of two ways that we can easily define our sketch entities. Constraints will define the entities based on some global defaults such as position based on the origin, whether it's vertical or horizontal, or in relation to other sketch elements such as parallel, perpendicular, or even equal. The endpoint of the line, however, is undefined because we didn't give it a dimension. We're going to be talking about dimensions and constraints a little bit later in a future video, but for right now, we want to understand how to create these entities. A line doesn't have to be vertical or horizontal. We can sketch a new line from any point. For example, I can hover until I find the midpoint, which is a triangular icon, and then I can begin sketching out to the right after I've placed that first point. Notice that I can drag it up or down at an angle in any direction. As I get close to horizontal, it's trying to apply a perpendicular constraint. But if I simply drag it up into the right and left-click, then hit Escape to get off the line tool, I now have a blue line which is under-defined. The line is coincident with the midpoint of our original line, but it is still under-defined because its length and its orientation or direction is not fully constrained or dimensioned. Next, let's take a look at a rectangle. There are three different types of rectangles, a two-point, a three-point, and a center rectangle. We're going to take a look at the center rectangle, but note that both the center and the two-point rectangles will follow the default horizontal and vertical in your sketch. I'm going to start from the center point or the endpoint of my first line and simply drag until the corner snaps to our second line. I'll hit Escape to get off of this. Notice that I can still move everything around because we haven't applied dimensions or constraints, but some are automatically applied. This one here is coincident between the endpoints of my line and my rectangle, we have horizontal and we have parallel and perpendicular. These get automatically applied as well as the addition of construction lines in the center to help us define this rectangle. Next, I want to take a look at the creation of a circle. We have five different options for a circle and we're going to be looking at the center diameter circle. But note that we have two and three points, we have three tangent and a two tangent. These various options can help you define your circles based on your selections. For me, I'm going to start at the origin and I'm going to move up until I select the midpoint where my two lines intersect and then I'll hit Escape to get off the circle tool. Once again, everything is under-defined or under-constrained, so as I change the diameter of my circle, notice the entire sketch changes. As I move the size of my rectangle, you'll notice that line changes as well. But some things are always going to be true. This line will always be vertical unless I remove that constraint, the intersection point will be at the midpoint of that line unless I remove that constraint, and my center point rectangle is based on a horizontal and vertical constraints. From here, we want to make sure that we finish the sketch and I'm going to do a quick save. As we're working with designs, if we decide that we need to make adjustments or edits to these sketches, we can either find it in the browser and make a change by double-clicking or right-clicking and selecting Edit Sketch, or we can go down to the bottom in our timeline and doing the same thing, double-clicking or right-clicking to edit the sketch. Notice that when we select the sketch in the browser, or if we select it in the timeline, it's highlighted on the screen. If we select it on the screen, it shows it in the browser exactly where we need to select. We can also change the visibility of it by selecting the eye icon next to the sketch. Let's make a quick change to this sketch by right-clicking and editing. I'm going to adjust the diameter of the circle, making it a bit smaller, then I'll finish the sketch. When I do this, once again, I want to make a quick save. Remember every time we save, we're creating a new version of that design and we can always go back to the older versions, promote them as new designs as needed. For here, this is a great place for us to stop the basics of creating a new sketch and understanding how to create these sketch entities. Once you're done playing around with this, go ahead and move on to the next step.
