Determine generative design criteria

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Determine generative design criteria.

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After completing this video, you'll be able to,

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to find generative design objectives and

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limits recommend general manufacturing method settings.

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Explain milling manufacturing settings,

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explain die casting manufacturing settings

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and explain added manufacturing settings

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in fusion. 360.

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We want to carry on with our internal combustion engine gen design set up

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at this point.

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We've selected all of our preserve and obstacle geometry

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and we've added all of our load conditions.

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What we want to do now is talk about our objectives and our manufacturing methods

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before we do this. It's a good idea to go up to your user preferences

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and to take a look at preview features.

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Oftentimes generative design will have preview features that can be turned

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on and you can experiment with some of the additional settings.

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For example, die casting is a manufacturing method which is currently in preview

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the experimental generative solvers and features.

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We're gonna leave this on for now

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and fluid path we're going to leave off as it doesn't apply to our structural study.

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Once we've checked the preview functionality,

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we're going to go into our design criteria and begin by defining our objectives

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by default, the objectives are going to be set to minimize mass.

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We have the option to minimize mass or maximize stiffness.

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When we use, maximize stiffness, we need to enter a specific mass target.

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For this example, we're going to use minimized mass. But a factor of safety of four,

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we can enable additional objectives and limits such as displacement

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buckling

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and modal frequency.

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We're not gonna be using these for our example.

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But it's a good idea that you view the information on the website

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to validate what each of these can be used for.

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There are certain criteria or restrictions.

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For example, when you're using the buckling study type,

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you can only select a single load case for modal

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frequency in our case because we're not really dealing with vibration

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doesn't really make sense to use this as an option.

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Displacement could be a helpful option when

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we're talking about manufacturing a connecting rod.

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However,

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minimizing the mass is going to be the objective we're going to use for this example.

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Once we have our objectives set, we're gonna move on to manufacturing methods.

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Cost estimation is something that's available for

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certain material types and certain manufacturing methods.

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We're going to leave this toggled on with 2500 pieces. For this example,

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unrestricted is going to take a look at the loads and constraints that we applied

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as well as our objectives but not place any additional constraints on the design.

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So by default,

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I always leave unrestricted on to get

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an idealized version of the generative outcome.

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Our additive section is gonna deal with additive manufacturing.

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This could be with plastic parts or metal

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parts or any other additive manufacturing technology.

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When we're looking at our additive settings,

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we need to think about the orientation of the build

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for our part Z plus and Z minus should give us the same result.

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But I'm gonna toggle both of them on as well.

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It's important to note when we're talking about

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using additive manufacturing or any of these settings.

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Any time we select an additional option,

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what we're actually doing is adding an additional outcome based

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on our objectives and any materials that we select.

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For example,

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if we have five different additive materials by

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using Z plus and Z minus orientations,

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we're gonna get 10 outcomes.

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The overhang angle is going to be specific to the machine that you are using

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in most cases,

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F D M or F F F machines can support.

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But it is important to understand the machine that

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you are planning to use for your designs.

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The minimum thickness is pretty straightforward and

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we're gonna leave this at three millimeters.

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Next is the milling manufacturing section.

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And by default, we have a configuration for three axis

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each time we set up a milling manufacturing,

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we need to think about the orientation of the part and

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the number of setups that we're going to use to machine it

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for a part like this,

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depending on whether or not symmetry was used in the orientation of our part

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Z plus and Z minus or two individual setups. For that one configuration

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might be a good way for us to define a three axis machining operation.

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We need to think about the minimum tool diameter.

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In this case, I'm gonna set this to eight millimeters,

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the tool shoulder length and the head diameter.

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I'm gonna reduce the head diameter to 50 millimeters.

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And then I'm gonna add an additional configuration.

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We're gonna do three axis again.

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But this time, we're going to include all six directions

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once again using eight millimeters as our minimum tool

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and 50 millimeters for the head diameter.

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As I mentioned previously,

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when we're thinking about multiple configurations such as 2.5 axis or two axis,

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there are going to be extra constraints placed on the design space setup.

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In the case of 2.5 and two axis cutting,

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we need to think about our preserved geometry being

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the same height and on the same plane.

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Now that won't work for our specific instance.

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So we're gonna use a five axis as another configuration

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for five axis.

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We don't have to worry about the orientation or direction because it's going to

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assume that we can rotate the part and have good access nearly everywhere.

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We are going to reset the head diameter to 50 millimeters.

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We're not gonna be exploring two axis cutting again because the

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previously mentioned problem that we have with our preserved geometry,

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but we are going to enable die casting.

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Once again, dy casting is currently a preview feature,

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but we do want to explore its options as

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they are unique and different from the other options.

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We have.

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The ejection direction is an important consideration.

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And once again, if we have all three selected,

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we'll be getting three outcomes for every

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material we choose for this manufacturing type.

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For our part,

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the Z direction is going to be the most likely direction for casting

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the minimum draft angle of three millimeters.

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The minimum thickness of 1.5 and maximum of 13 are the defaults,

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So I'm gonna set it to three millimeters

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the same as our minimum thickness for additive.

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Once we have all these set,

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we can take a look at any precheck warnings that we might have

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note that we still have a precheck warning that tells us

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the head diameter is large compared to the model size.

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This is an important consideration to think about,

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but it's not necessarily something that you have to fix.

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When you're setting up your manufacturing methods,

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you should be using values that represent the

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tooling that you have available to you.

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So it's not a good idea to just adjust

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these values until we get rid of the precheck warning

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because ultimately,

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what that means is we might end up with geometry that can't be machined easily.

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So for this example,

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I'm going to allow the precheck warning to remain noting

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that it's only identifying a milling head diameter issue.

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At this point.

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We've taken a look at edit model, our design space,

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our design conditions and our criteria.

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So we're nearly ready to solve our generative study.

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But let's go ahead and save the design before moving on.