Adding symbols to identify datums and surface finish

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In this video, will add symbols to identify datums and surface finish.

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After completing this step, you'll be able to use surface texture, add a feature control frame and create datum references.

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In fusion 360, we want to carry on with our coupler for production drawing.

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Now we're going to talk about the symbol section and adding surface texture feature control frames and data identifiers.

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Let's get started with these surface texture note.

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I'm going to add this to this inside face of our part. Select the position and drag it out to its final location.

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And then, I can either right click and select enter or press enter on the keyboard.

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This gives us a surface texture symbol and we can determine what type of surface texture symbol we need based on our specific requirements.

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I will note that when you're creating a detailed drawing and you're using one of the two standards,

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the surface finish texture symbol does change slightly.

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So do make sure that you are using the correct standard for your application.

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The first type has basic, the second type has material removal required and the next one has material removal prohibited.

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These different types of symbols will determine what is happening or which operation is happening for the specific geometry.

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So you'll note that the symbol does change whether or not we're keeping the material as is we're removing material

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or we are just simply using the basic type.

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Now, it's important to note that when you're using the removal required or removal prohibited.

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These would be things like if you're requiring a surface grinding operation that's material removal required.

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If you are prohibiting it, it's probably a controlled surface one that has tight tolerances.

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We're going to be exploring the basic operation type. So let's take a look at what options we have.

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We have a first requirement, we have a second requirement, third and then first process.

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When we talk about the requirements and the process, we really need to talk about what those mean and where they end up.

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So when we take a look at the first requirement, let's go ahead and start typing something in and see where it appears on our drawing.

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When we take a look at a second requirement, let's take a look at where this appears.

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Notice that the first and second appear underneath the symbol.

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When we go down to the first process, when I type mill here, notice that it appears above the top line.

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So again, it's important to understand exactly where these items are coming from and what that means.

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So in this case mill is the first process in anodized is the second process. So analyze happens after milling.

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Notice that the symbol is starting to overlap something else and we'll just have to move it later on.

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We can also take a look at some of the other options. For example, the direction of Les.

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We have parallel, perpendicular, we have crossed multidirectional circular, radial and we have this particular or non directional.

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In our case we're going to use X and once again notice where it comes up.

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And also now we can enter our first, second or third requirements.

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In this case, we're going to have 0.1 as a requirement and we're going to say okay.

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When we're looking at these values, what we're looking at is going to be the requirements that are needed for the surface texture.

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Now in this case this is something that would be milled and then anodized,

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and then we have a specific value for measuring or testing its surface finish.

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The direction of LES is X or crossed. And again that helps us understand the requirements for that surface.

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Now these are simply just made up for this example. There are multiple requirements that are needed whenever you're creating surface textures.

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The next thing that we want to talk about is going to be adding datum.

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Datums are symbols that are required to identify the areas of a design that are controlling the tolerances.

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For example, if we add a datum, identify where to this back face, we pick its position and in this case the first identify there is going to be A.

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We have datum notes that we can add but in this specific instance we just want to add the identifier and say okay.

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The A means that this is the first surface that is going to be referenced or controlling specific geometry.

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This also helps when determining how to hold a part in a fixture or advice when your machining or fabricating it.

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The next thing that I want to do is I'm going to add a secondary datum identifier, the secondary one is going to be the outside diameter of this part.

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So I need to select the object and I need to select the position.

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Once I'm happy I can hit enter and the identifier in this case is going to be B.

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Generally, you would have an A B and C reference,

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but it's going to be determined basically by the type of geometry that you're working on in your requirements.

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But now that we know how to add the A and B datum references, what does that really mean.

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Well we can use feature control frames to help better identify specific geometry that is required by those tolerance datums.

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I'm going to use the secondary view here and I'm going to bring this down,

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and I'm going to place it in this bottom corner and then begin to define the feature control frame.

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Notice that we have a top note and a bottom note. We have our geometric symbol and then we have our tolerance values.

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What we want to do here is we want to first determine, what are geometric symbol is going to be in this case.

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Now the datum identify rare for A is off of this back face.

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So that backside of our coupler, we want to make sure that this face is parallel to that. So we're going to use parallelism.

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We need our tolerance value or what our requirements are for keeping it within that parallel value.

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And I'm going to add 0.1. Then we have our datum references, notice that we can have several symbols.

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For example, if we want to use a plus or minus or diameter or a position symbol.

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Now we have parallelism. So we're going to just simply use that parallelism and we're going to reference datum A.

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So this feature control frame is telling us that this surface needs to be parallel within this tolerance value with respect to datum A.

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So these feature control frames and the data references will help us better identify the specific areas of a design,

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that need to be tolerance controlled.

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Generally what you would have on a detailed drawing is a general note about tolerance values unless otherwise specified.

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And that's where these feature control frames and these data identifiers are going to come in,

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to add in those additional areas that have those higher tolerances.

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At this point, let's make sure that we save this detailed drawing before moving on to the next step.