Fusion 360: Sketch Constraints

hey everyone fusion 360 evangelist Taylor Stein here and in this video we're going to be looking at sketch constraints in fusion 360 whenever you've been sketching you've probably seen these constraints that show up here in the sketch palette in this video we're going to walk you through each of them showing how they work and really what they do first up let's take a look at the coincident constraint this constraint applies a position continuity between the two objects that I select I'll select the center point of this circle in this line and you'll see that the coincident constraint shows up if I click and drag on this point you'll see that it has to stay on the line or really the infinite extension of this line I can also apply coincident constraint between two points I'll choose the coincident constraint choose this point and this point right here and now when I click and drag on the point I'm not only changing the position of the circle but really the location of the endpoint of that line let's go ahead and move on to the next one next up we have the colinear constraint what this does is not only make two lines parallel but make them share one common line - see what I mean I'll choose the Culinaire constraint choose this side of this rectangle and choose this line you'll see that now not only are they parallel but they share that one common line let's move on to the next one next up we have concentric this constraint can be applied between circles and arcs what it does is it really aligns the center point of both circular objects that you pick I'll go ahead and choose the concentric constraint and let's choose this circle and this arc right here you'll see that now as I click and drag on the circle I can change its size but the center of the circle now has to remain right at the center of this arc next up we have the midpoint constraint and this can be applied between a few different objects I'll go ahead and choose the midpoint constraint and you'll see that I can apply it between a point and a line and now this point has to remain at the midpoint of this line I click and drag on this line to change its length that point isn't going anywhere it has to stay right at the middle I can also apply a midpoint constraint between two lines I'll choose this side of this rectangle and this line right here and you so that now the midpoints of both of those lines are aligned it doesn't necessarily make these two lines collinear but I can do that if I want by using the collinear constraint that we saw earlier go ahead and choose that and pick this line in this line and now we have them sharing midpoints and align that way additionally I can apply again a midpoint constraint between a point and a line so I can choose midpoint and choose this point in this line and now this line segment has to terminate at the midpoint of this line so if I click and drag over here the angle may not be set but that end point is really stuck at the midpoint of the other line even if it's length changes as well next up we have fix or unfix what this does is really lock in place or free up whatever geometry you select I'll go ahead and first apply a coincident constraint between the endpoint of this line in this circle and use that now I have that coincident constraint in place if I were to click and drag on this point you see that I'm changing not only the location of the endpoint of this line but also the size and location of this circle if I don't want that and I want the circle to stay in place what I can do is use the fix constraint I'll go ahead and select the circle and then choose fix and you'll see that it's now green now if I click and drag on the endpoint of this line so that nothing happened to the circle but I can change the position of this line much easier next up is the parallel constraint this one's not too tricky all it does is it makes the two lines that you select parallel let's go ahead and make this line right here parallel with this green one that I've fixed earlier to do that I'll choose parallel choose this line in this fixed line right here and now both of them are parallel next up we have perpendicular and just like parallel this one's not too complicated makes the two objects that you select perpendicular or really just meet at a 90 degree angle let's go ahead and choose perpendicular over here and I'll choose this line in this top line of this rectangle and you'll see they're now perpendicular no matter where I position this line it has to remain perfectly perpendicular to this line over here if I want it to actually touch this line I'll have to apply another constraint I'll choose a coincident constraint and choose this point right here in this line now they meet at a right angle and they have to touch next up we have horizontal / vertical which is one of the constraints that I use most inside a fusion 360 with this constraint does is make the two objects these select either horizontal or vertical based on whatever is closest to see what I mean I'll go ahead and choose horizontal / vertical and I'll choose this point right here in this point and we'll see that they become horizontal I can also apply this horizontal constraint to a line so if I pick this line over here now that line has to be horizontal so I can adjust the location of this circle move everything up and down but all three of these objects here have to remain horizontal from each other I can also choose the same horizontal / vertical constraint over here and if I choose this point in this point they become vertical from each other and that's because those two points are closer to vertical than they are horizontal next up we have the tangent constraint this is really similar to the coincident constraint but one degree further instead of just positioning two things together it makes sure that they have one continuous surface between them to see what I mean I'll go ahead and choose a tangent constraint and I'll choose this circle in this line and now they're tangent far to change the size of the circle you see the rectangle beneath that adjusts so you have one smooth transition over here I can also apply this relationship from this line over here to the circle go ahead and choose tangent and I can choose this line in this circle and now when I move this line around you'll see that it has to always remain tangent meaning it just touches the circle at one single point next up is the smooth constraint which is very similar to the tangent constraint but applies even a smoother transition between the objects this is also referred to as g2 continuity to see what I mean I'll start by drawing a spline and connect it from this point over here to this point right here now it might just look like a line but these handles can adjust to make everything smooth I'll choose the smooth constraint and choose this line in this line and also choose this line in this line now not only do I have g1 tangency between these curves but I have g2 curvature continuity between all these curves next up we have the equal constraint what this does is really make any objects you have the same size instead of dimensioning all of these circles to be the same size we can use the equal constraint on them to start off I'll just apply it between two circles I'll choose the equal constraint choose one circle and another one over here and you'll see that now they're the same size and I have this equal constraint icon show up if I change the size of these both of them adjust accordingly I can also select multiple objects before choosing the equal constraint so let's go ahead and choose these three circles right here choose the equal constraint and now you'll see that if I adjust any of these they all change in size as well now they're ready for me to add a dimension to one of them so if I were to dimension this circle right here to be 40 millimeters is that they all adjust to be 40 next up we have the symmetry constraint what this does is it makes two objects that you select symmetrical about a third object that you select if I want to position this rectangle right at the middle of this other rectangle there's a few ways I could do it I could do it the way before where I apply a midpoint constraint between this line right here and this point or I could also use a symmetry constraint let's go ahead and do that I can choose symmetry and choose two objects so I'll choose this line in this line and now I can choose a third line that's really the line of symmetry you'll see that now if I click and drag on this rectangle it has to say symmetric about this green line of symmetry down the middle lastly if I want to position these together I can go ahead apply another midpoint constraint between this line right here and this one as well so there are all the constraints that you can apply inside of fusion 360 then also a few more tricks that I want to show one thing you'll notice is that if you have sketch geometry already selected you have certain constraints that can be applied or not you'll see that if I select this circle right here some of the constraints become grayed out because I can't use them making a circle parallel to anything doesn't make any sense so it doesn't let me accept it you'll see that if I select a line over here I also have different options additionally if you have two items selected the list refines even more so with a line and a circle selected I really only a few choices tangent or fixed and also instead of selecting the constraints here in the sketch palette if you have two objects selected you can also right-click and you'll see that here in the marking menu I'm given a list of constraints that I can apply between the two objects that I've selected I'll go ahead and choose a tangent constraint and you see that now these two objects are tangent to each other so there you have it those are sketch constraints inside of fusion 360 hopefully have a better grasp on the concept and can start to utilize these as you're sketching out your designs if you like this video be sure to give it a thumbs up if you have any questions you can leave them in the comment section below and as always if you want to reach out to me directly you can always tweet me at Taylor underscore Stine thanks for watching

Channel: Autodesk Fusion 360

Views: 249,718

Keywords: fusion 360, autodesk, design, engineering, mechanical design, mechanical engineering, industrial design, product design, software, CAD, CAD software, Computer Aided Design, Modeling, Rendering, 3D software, Autodesk fusion 360, cloud based CAD, CAD in the cloud, cloud, Free CAD, Free CAD Software, Autodesk CAD, cloud manufacturing, free CAD program, 3D CAD solution, constraint, sketch, dimension, sketching, constraints

Id: J_2If5zVp84

Length: 8min 57sec (537 seconds)

Published: Thu Aug 11 2016