![]() ![]() If I select the arc and then select the circle you’ll see that now both entities share the same center point, which is represented by the concentric glyph. So if I wanted to ensure that this circle has the same center point as the arc, I can activate the concentric constraint by clicking on it, then I’ll click on the entities in either order. The next constraint is “concentric,” which forces circular sketch elements, such as circles and arcs, to share a common center point. If I want this top line to be on the same axis as this other line here then making sure “collinear is active” I can simply click on the first line, that will be used as the axis, and as I click on the second line you’ll see that it moved to that same axis…and added the collinear glyph. The first entity you choose will remain in place, and the second entity will satisfy the constraint. I should also point out that the order in which you select the lines DOES matter. The collinear constraint forces two lines to share a single axis… and they can be at any angle… they do not have to be vertical or horizontal lines. ![]() You’ll also notice the glyph or icon that represents the coincident constraint was added so we know how this area is constrained. I’ll select the end of the line and then you’ll see that the lines are joined together. In this case, points are all that I can use to complete the coincident constraint. If I select this line first, then you’ll see that as I hover over the lines it only highlights the points. To add a coincident constraint we can either select a point or a line. Using sketch constraints in Fusion 360 will help ensure that your model updates as expected when you change any sketch dimensions. Constraints help the sketch stay intact, ensuring that elements don’t break apart or move to unpredictable areas.Įssentially, you’ll want to use sketch constraints to maintain the shape of your sketch so your sketch stays 100% predictable… with emphasis on the 100%, because if you’re constraining AND dimensioning your sketches correctly then you should always know what is going to happen when you make a change within the sketch. These sketch constraints allow you to maintain certain behaviors when the sketch is updated. Now let’s talk about why to use these sketch constraints. (Click here to watch a video on Sketch Constraints) To activate any constraint we’ll have to click on it in the sketch palette, and you’ll notice it shows it’s active by the blue highlight. If you look at the constraint icons in the sketch palette you’ll see that the sketch constraints use geometric expressions, with the exception of fix/unfix. If you can grasp the concept of the sketch constraints, then you’ll be in a much better position, especially as you start to 3D model more complex objects.Ĭonstraints allow you to relate one sketch entity to another sketch entity. In this article, I’ll explain what constraints are and then I’ll explain what each constraint actually does. In order to master Fusion 360, it’s important that you have a solid understanding of sketch constraints.
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