Welcome to lecture 2, segment 2-2, a introduction to basic sketch curves and the introduction to the sketch navigator and editing a sketch. Since we already know how to start a part, we're going to jump right into the user interface of Sketcher by selecting the sketch button. And this is something you'll be doing quite a bit in this course. Sketches are usually the start points of all models. So, we'll hit the sketch button that's indicated on the home tab. And this will ask us to create a plane like we talked about last time. And we're going to just going to pick the front plane here. Just the edges of it. We'll see the word sketch come up. And it's in the right orientation. So I'll hit okay. Now since we're sketching on the front plane, we should see the letter Z and X right here orthogonally looking straight down the Y-axis. So we should not see any rotation. But if we accidentally do rotate off for an unwanted reason and want to get back, we can always rightclick just in whites space here and hit orient view to sketch. So, in any case you accidentally rotate away and you want to get back to looking straight down your sketch axis, you can use the orient sketch. For this basic curve video, we're going to speak about the first four commands here and mainly stay on the left side of this screen. All these other commands we'll get into future videos with solving and editing. So, let's start with the line command. Now, there's some interesting subtle things with the line command. If you start drawing by holding down the left mouse button and dragging your line, you're going to get this green number which gives you on the-ly length of your line. And usually I'll just ignore those numbers for now. And I won't ever use the size command cuz I'll just handle that later. And we'll talk about that in a later video with our dimensioning and solving. But if you know the length of your line, you could put it in now or we usually do that a little bit later. So if you select your line and select another position without dragging with the chain curves option on, you're going to start drawing another line. So that is what used to be the profile command here. And it just lets you keep going and drawing connected lines to one another. If you start dragging the line, which I'm doing now by holding the left mouse button and then releasing, you'll see that the line ends and I don't have to start another line. And if I get into it with a profile method and start chaining lines, I can always break the chain here or rightclick and break the chain. And any line that I've rightclicked, I can also perform these operations as well. I can also convert to arc right on the fly and just change that last segment to an arc. And I can rightclick and change it back to a line if I wanted to. So if you are ready to end the line command, you can break the chain or you can just hit escape. It'll remove the last one you're previewing and then it will get you out of line command. Now let's go to the arc command which is a little bit more difficult and some subtleties. When I draw an arc, the first point is going to be the start point and the second point will be the end point and the third point for my first arc will be how it bends. If you have the chain curves setting on, then the next arc it's going to draw will start from the end point. And depending on how you leave that end point with your cursor will determine whether you're going to bend to the left, the right. If you come out perpendicular, you can see I have the ability to not have a tangent arc. If I come out too close and go backwards, I'm going to be tangent that way. If I come out this way to the upper left, I'll be tangent again down at the arc, but I'll be bending it to the left. The easiest way for beginners I recommend is to not chain your arcs. So you could just draw one at a time. when you have to draw a second one that's connected, just draw a second one that's connected. And then we can worry about tangencies later on, and we'll talk about that in a future video. But if you really get experienced with chaining of segments, then you can hold down alt and realize that you can not have the snaps anymore. So you can see it's trying to snap where it gets close to tangency. That's that blue icon that comes up. We're going to have tangency there if I let it go. But if I hold down alt while I drag this around, then I don't get a tangency. And I maybe I can make it tangent later or I don't have to have tangency if I don't want it. Once we place it down, that'll lock it in. And like I said, it doesn't have to be tangent if we don't want it. And if it's not tangent, then I do have the opportunity to have that second point in. And it's going to keep chaining unless I do the unselection of chain curve. The next curve down our list is the circle. And that's pretty easy. One of the easiest segments to draw. You'll just pick the center point and resize it as you need it. Pretty easy there. You just pick another spot. Even if you drag, it'll do the same thing. And they either have diameter or radius, which we'll talk about in a future video. The rectangle command, I'm going to talk about a couple methods to do it. So, you'll just pick and either drag or pick the next corner. So, you'll get a horizontal and vertical height with our rectangle. And if you ever have to draw a rectangle that's slanted, that's another method. So, I usually do rectangle by three points. I hardly ever use rectangle from center. In all my years, I've rarely ever used that one. But a rectangle by three points will give you the option to pick the second corner. And that'll set your slant or angle. And then you can pick the height of your rectangle with your third corner. And that'll set your rectangle at a slant. Now, once I have some segments down, I can easily delete segments by right-clicking them and using the X or delete key on your keyboard. So, you can delete segments. So, I'll delete a couple segments to show you how easy that is. We also have a new item in this version of NX called the sketch navigator. And you might want to spend some time with this or leave it up when you draw things. And we'll talk about some of these other tabs in a future video. But right now, this sketch navigator gives us a listing of every curve in our sketch. And we see we have plenty of arcs and lines. We have our horizontal axis, our origin, our vertical axis. Those came in. And some status icons, which will become very important to us in a future video. And we'll have some other tabs here we'll also talk about. But for now, just a listing of the curves. You can see all my curves are movable. And that's what our little status icon says. They're all movable. Eventually, when we draw things, we want to get down to a state where none of the curves are movable because we have a fixed position. Our design calls for the exact geometry and position and dimension of things, and we don't want our curves to be movable unless there's a reason for it. In this course, usually there's not. So, we'll come back to the Sketch Navigator more along in some future videos, but we can also rightclick and delete arcs. And of course, you can undo and look at the list to show you what you've done recently. So, you can undo back to a certain state if you need to. Let's talk about moving curves. Once you select an item that has not been dimensioned or constrained, which we'll talk about later, let's talk about moving curves. Now, once we hover over an item, we should see some drag handles on curves that are movable, and they can be moved around as well. So even the line as a whole can be moved even though it doesn't have a drag handle. If it's not connected to another segment or piece of geometry, it should be movable. If I select the circle, I have two movable items. The center will drag its position around and the other drag handle ball will move its radius or diameter in and out. For lines, we'll have three drag handles when we select them. We have the midpoint will just move kind of its overall position. And then the end points will do the same thing. So just the X and Y of their positions. And arcs will have four drag handles. The midpoint of the arc, which will change its bend, and the end points will change those positions. And also, when you hover over and select an arc, you'll find its center, and you can move that around if it's so movable. So, I'll just undo that. Showing you that you can move curves around when you initially draw them, unless they're connected to some other curve, and then some constraints will take over. You'll see when I move this line, this line also resizes. And we'll talk about constraints that are doing that in a future video. Now we'll speak about reference geometry. Reference geometry is really easy to make. You just take any geometry that's live or active, which are solid lines. And you can use the first icon here when you fly out called convert to reference. And when you select that option, your circle here will become reference, meaning it'll have a long dash and followed by two short dashes and it will repeat. That's how you know it's a reference geometry. And if you scroll down on our sketch navigator, our arc has just moved to become a reference arc. And reference geometry is useful for when you want to size or position other geometry, but you don't want this geometry to act later on in our solid creation. So, for example, I'll delete everything here. So, I'll just draw a box around all our curves and hit delete on the keyboard. And that'll remove all the curves here. And I'll draw a rectangle, just a standard rectangle, and I'll just make it large here. And I'll also put a line in the middle of it that traverses the diagonal. Now, this is looking a little ahead here, but if I wanted to make this rectangle a solid, you see it can't really include that middle line because it'll give me a failure. It doesn't know whether to extrude a box or two triangles. It'll it'll have an alert here and I can't extrude it. If I go back into my sketch and change this line to a reference line, and this lets me perhaps I want to make the midpoint of this reference line right on the origin, which we'll get to later on, and make it a square so it's resizable. If I extrude this now with a reference curve, even if I select the reference curve, it knows that this curve is not part of the geometry. In fact, I can't really select the reference curve again. It's not going to be attempted for the software to extrude it. So there you saw me go back into a sketch that was already there. Just double click and edit it or right click in the part navigator and edit it. And once you do that, you'll get this sketch navigator available again. You can always finish a sketch by using the checkered flag or hitting control Q on the keyboard. And if you have multiple sketches, which we'll do that later in the course. So if we just pick another plane here, you can see we have a lot of sketches and we can keep finishing. Now to pick which one is active, the active sketch is going to be the dash sketch. So if you go into the new sketch and you're trying to work on these lines, you can see you can select them if you have your work partly filter on. So if you have active sketch, actually you won't be able to select them. You'll see I'm trying to pick them, but my filter is not letting me because it's I'm in a new sketch. But if I have work part on, it will let me pick them, but it won't let me do anything with them. Even if I double click them, I can't move them around. All I can do is draw new things and I could probably attach them to them. To help you, the color of the old sketch or the first sketch has been slightly grayed away. So you'll know it's blue, whereas your curves may be brown or black. That lets you know that these curves are in a different sketch. So always keep track of what sketches you're drawing in and do not keep any empty sketches. So, if you especially in the beginning of the course, if you keep hitting the sketch button to get back into your sketch, what you'll do is just keep creating new sketches. And you'll be might be wondering where did my square go? Well, you're sketching on a different plane now. So, you can see that I'm sketching on a different plane. So, that's not good. And also, this sketch was empty. And you can't delete a sketch while you're inside of a sketch. Notice that I don't get a delete key here. If I have an empty sketch and I want to get rid of it, there's no delete option here. When I right click the sketch, you have to finish the sketch before you can delete a sketch. So now when I finish and I'm not in the sketcher, I can use the delete key to delete my empty sketches. And you know they're empty when you select them and no curves highlight here. When I select a sketch that does have segments on it that I want to keep, you'll see that it's nice and orange and it lets me know things are in that sketch. So I will rightclick and delete this sketch. So we don't want to keep an empty sketch. So as a review, we looked at inside the sketches, lines, arcs, circles, and rectangles. We talked about chaining lines, chaining arcs, although I recommend you don't use the chain command when we draw arcs, at least in the beginning. We looked at reference geometry, converting reference to active and back and forth to reference by using that convert to reference. And also the line command and arc command also has you create reference geometry off the bat. There's an option you can play around with too if you know you are going to create reference geometry immediately. And we looked at deleting sketches and having multiple sketches and also took a look at the sketch navigator which we'll get into more in future videos. This will conclude lecture 2 segment 2-2 on sketch introduction of curves and we'll pick up next time with cursor and snap selection.