Create digital assemblies

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Create digital assemblies.

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After completing this video,

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you'll be able to create and remove assembly components,

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use joints to create assembly motion

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in fusion 3 60.

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We're going to begin with the supply data set, reversing Geneva device.

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If we take a look at the design, you'll note that we have a joints folder.

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At the top level of our design,

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we have a bodies folder which contains three bodies which

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appear to be the rotating points for each gear.

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And then we also have a sketches folder that contains one sketch called base.

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There's also two gears in here, a 24 tooth and a 12 tooth spur gear.

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The first thing that we want to do is identify each of

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the components and this can be done in a few different ways

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in the gear icon. In the lower right, we can toggle on component color swatch.

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This is going to highlight the features in the

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timeline as well as the components in the browser.

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We can see a green color next to the spur year 24 as well

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as a green color above all the features that were used to create it.

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However,

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this isn't going to give us all the information we need to simplify the process.

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So we're gonna toggle this back off,

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go to inspect and toggle on display component colors.

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This is gonna also add the color to the browser as well

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as the timeline and temporarily modify the appearance of each component.

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We can see that the three bodies all contain the same color,

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which means that these are bodies at the very top level of our design.

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The 24 tooth spur gear is green and the 12 tooth spur gear is orange.

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This design currently contains a handful of joints

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that already allow it to replicate its motion.

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However, it's not exactly correct just yet.

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The first thing that we wanna do is we

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want to identify the link between these two gears.

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In order to do that, we're going to go to the assemble menu

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and we gonna select the option to create a motion link.

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The motion link will allow us to select two joints. In this case, revolution one

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and revolution two.

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Now we need to define how the two joints will move together.

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In

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this case, when we play the animation, we can see that the rotation is correct.

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However, the amount of rotation is not correct.

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And this is because one of the gears is 24 teeth and the other is 12.

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This means that the smaller gear is gonna rotate

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twice as many times as the large gear.

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So for revolution one I'm gonna say for every 180 degrees,

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the small one will move 360.

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If I play through, we can now see the gears are in sync.

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Any time we have a mechanical relationship that can make use of motion links.

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As opposed to using something called contact sets.

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It's gonna be much easier for fusion 3 60 to calculate that motion

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and the end result will be much smoother.

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However,

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that's not always the case as some devices

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will need mechanical motion defined by contact sets.

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The next thing that we want to do is we want to create a new component.

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When we talk about adding joints for mechanical motion,

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it is important to note that every design in fusion 3

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This means that any new bodies created belong to

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that component and joints can be applied to those.

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However,

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it's important also to note that fusion 3 60 takes the origins of each component

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and calculates the location of each of those components

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throughout their motion based on the origin position.

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So a joint can only be applied between components that are

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unique or in their own component with their own origin.

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As we rotate these,

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you can see that the planes and the coordinate

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systems for each component are moving with them.

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This is an important distinction that we need to understand when we're

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applying joints and deciding how our assemblies are going to look.

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Now, let's go ahead and enable or show the visibility of the base sketch.

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If we were to simply use the sketch,

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as is we could create a solid body or a component from that dialogue,

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it's always a good idea.

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However, for us to create new components, whenever we know we're going to need one.

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So I'm gonna start a new component

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and I'm gonna call this one, my

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Geneva Gear.

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This new component is going to be active by default

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and it's going to have its top level or

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parent based on whichever component is currently active.

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And for us, that's the top level of this design.

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When we select it,

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you'll notice the opacity of all other bodies and components

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changes because the focus is now on this new component.

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The sketch is still visible in this case,

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sketch base and we can use that to create our new extrude.

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We'll select extrude and select all the regions that we want to extrude.

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When we're working with complex sketches that have overlaps.

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Oftentimes, it can be helpful to hold down the control key

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and this will allow us to make those selections a little bit easier.

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We also want to make sure that we hold down

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the control key and select the smaller inside diameter.

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We also are going to need to think about the location of this gear where

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it needs to be at in terms of its height relative to the other positions

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for that, we're gonna change the start to be from an object.

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This is going to be the top face of this boss

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from here. The distance can go to the top of the object.

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When we're selecting these objects,

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it's important that we don't select the entire body.

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But instead we move our cursor until it shows a highlighted face.

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This is going to be a new body inside of our component.

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We can see that this is rather large and we can adjust these values as needed.

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For example, I can use a distance value

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instead of using the two object.

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So let's go ahead and make this one a distance of 10 millimeters and say, OK,

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now our geneva gear is in the correct height position,

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but it's not in the correct rotation and it doesn't have a joint applied yet.

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For this. I'm gonna go ahead and activate the top level component,

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go to my assemble menu and create an as built joint.

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The

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asphalt joint will make use of the current location of the design components.

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We're gonna set this to revolution,

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select the component and then the pin which is going to be the body location.

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And then we're gonna select this snap point.

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Notice that in this dialogue, we can also toggle on joint motion limits.

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This allows us to determine the minimum

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and maximum amount of rotation for these components

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because we are dealing with gears that have revolution joints about their centers,

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we're going to allow it to rotate through its full motion if needed.

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The next thing that we want to do is rotate this Geneva gear just

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slightly to make sure that this position can't come inside of the slot.

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So in order to do this, we need to make sure that we rotate the gear

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and that we capture its position,

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that's gonna place a capture position feature in the timeline and it's gonna

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record the orientation of the planes that are used inside of that component.

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We can see here that was a minus two degrees rotation

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at this point.

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We've got revolut joints for all the gears and a

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motion link between the 12 and 24 tooth spur gears.

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However, we still don't have the motion to represent the Geneva gear.

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So we're gonna do that by going to

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our assemble menu and we're gonna enable contact sets

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whenever we're using contact sets.

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We want to be careful not to use all contact sets because it's

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gonna calculate the intersection and interaction between

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all solid bodies in the design.

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For this instance, we are going to go to our contact set menu.

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We're gonna right click and create a new contact set

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between our new Geneva gear and the green spur gear.

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We're going to repeat that process by right clicking and creating a

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new contact between the Geneva Gear and the 12 tooth spur gear.

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Now, as we rotate through,

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we can see that the green gear is entering that first slot and

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rotating our Geneva Gear by a distance of 100 and 22 degrees.

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Then the smaller spur gear is gonna come in and move it back

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and it's gonna pick it up to get it back to its original position.

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This is a really interesting device and they're fun

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to create in 3d to see how they work

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and using a handful of joints.

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In this case, some revolution joints,

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a joint limit between the gears and a single set of contact sets.

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For the Geneva gear allows us to replicate the complex motion

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and fusion can do this relatively quickly.

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We can also evaluate this by going to our

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assemble menu and taking a look at a motion study

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for a motion study. We need to select a joint

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and we need to tell the joint what it needs to do at certain positions.

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So for this one, at 100 I'm gonna say, rotate 360 degrees.

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And I'm gonna go ahead and play through it,

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we want to reduce the speed,

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move this out of the way and press play.

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Let's go ahead and loop this around and play through.

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And now we can see that the Geneva gear is moving throughout its motion.

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By using this motion study.

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We're able to see it happening in real time

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and evaluate the design and maybe determine any design changes

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once we select OK.

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The motion study is going to be located in a folder inside

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of our browser and can be used or edited later on.

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We simply need to select it,

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edit and we can go back and make adjustments at any point in time

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once we're done, creating all of our joints, components and contact sets.

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Let's make sure that we do save this design before moving on.