Create draft as a feature

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Create draft as a feature.

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In this video, we'll use Draft on a body and use Split Face.

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In Fusion 360, we want to carry on with our drafted spur gear.

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At this point we've modified the original extrude features to include a draft or taper angle.

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We know that the side faces of the gears or the teeth themselves are drafted minus half a degree.

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When we take a look at the rest of the design, we have to be mindful of its intent.

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In this case, we need to preserve the round shafts as they're going to be used inside of a bearing surface.

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So keeping that in mind, we can't simply add draft and taper it toward the Z direction.

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Because that means that the bearing that gets pressed on here is likely only going to have a single point of contact.

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So in this case, we're actually going to be drafting it in the Y direction.

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The first thing that we want to do is go to Modify and select Split Face.

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When we look at split, we have three different options.

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And in this case, we're simply going to divide the faces of the areas that we want to draft.

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And we don't want to divide the body itself.

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By using Split Face, we need to pick the faces that we want to split.

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And in this case, I'm going to select all of the different faces that are included in the areas that we're concerned about.

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So this will be all the way up to the top.

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And once I'm happy with those, I'm also going to select the top face of the gear and then I need to select my splitting tool.

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For me, that's going to be the XZ plane.

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So I'm going to go in and select XZ and say, OK.

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This is still a single solid body, but now we've divided it up so we have better selection for applying that draft.

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We're going to go to Modify and select the Draft tool and then we can begin by first determining what type.

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A fixed plane or a parting line.

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The parting line option is great in certain instances,

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but for our case we don't want to use parting line because we're going to be focusing on one side of the split and then the other.

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In some cases if you want to include that split or the parting line,

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you can use a sketch to help determine where the part is going to be split and then draft on either side of it.

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It’s a little bit more of an advanced technique so we're going to focus our attention on using the fixed plane method.

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The poll direction is going to be our XZ plane.

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So I'm going to hold down the left mouse button and select XZ.

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Notice that it's showing an arrow for the pull direction and if we need to we can flip.

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I am going to turn off tangent chain because we still have tangency even though we split the faces.

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So we want to make sure that we deselect that as an option.

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Now we can go around and select all the faces that we want to draft.

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When we do this, notice that it lets me select the first face but it's not allowing me to select the side face here.

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It's only allowing me to select these top faces.

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For the angle let's enter G and use gear draft and see how this affects the model.

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Sometimes it might be hard to tell so we can artificially use a larger value to ensure that we are actually drafting in the direction we want.

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When we add 10 degrees, we can see that we are adding quite a bit of draft so we can go back and use gear draft which is half a degree.

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And we're going to have it draft on one side.

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We'll say OK and now we've applied that draft.

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If we look at it from the right hand side, notice that it's actually drafting up to that line and moving away at half a degree.

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We're going to repeat the process using our right click marking menu.

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This time, the pull direction will be the same.

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So I'm going to select that XZ plane.

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And for the faces, we're gonna use the faces on the other side of our selection.

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If you need to, you might want to hold down the control or command key to make sure that you are selecting all the faces.

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It remembers our half degree selection but we want to use that gear draft parameter in case we need to make any changes later.

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We'll say, OK and take a look at this from the right side.

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While it doesn't necessarily appear like we have enough draft, let's verify this by using Inspect and creating another draft analysis.

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We use the same body selection but for our plane we need to use XZ.

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We're gonna take a look at it from 0.4, positive 0.45 and negative 0.45.

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Remember we are using half a degree and we're going to not use anything in the tolerance zone.

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If we have any difficulty setting these values, you can always reset them to zero,

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and then you can use the slider or you can use the up down arrows to get us closer.

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Once again, I'm going to alter these to 0.45 so I have complete colorization.

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If I were to reverse the direction or take a look at some areas of concern, you can see that right in the middle, there is a small red area.

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Now, often times when we apply draft to a model, what we're really doing is we're giving it away to self-eject from a mold.

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As the plastic cools and begins to expand,

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we wanted to automatically eject itself from the mold rather than get sucked into the mold and not be removable.

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When we're talking about a shaft where we have a rounded section coming directly up to the parting line,

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the majority of that shaft has plenty of draft on it.

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But right at the middle or right at the parting line often times you will have a slight problem.

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You can get around this in most cases by talking to the manufacturer and seeing if they can actually draft,

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or use a part that's undrafted around the round section.

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If they need a draft, we can always put a small flat section there and still have the functionality needed to actually support the bearing.

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In our case, everything looks pretty good.

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So I'm going to say OK and just verify that I have applied the draft to all the areas.

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We go to our Analysis folder and take a look at the first draft.

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You can see that we still have areas of concern underneath.

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So we can use Modify, Draft, select the type, the pull direction and the faces.

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In our case the pull direction is going to be Z.

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So the plane that we're going to select is XY.

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The faces that we want to draft are going to be any of these side faces,

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and it looks like there is a small amount of green and red that's displaying on the side here.

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So let's make sure that we select that small face as well.

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And then the draft that we're gonna want to use is that gear draft value and we’ll say OK.

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If those are showing up green now instead of red, that means that we have enough draft.

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So everything looks to be okay.

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You can always validate this by going to a bottom view and seeing if you can actually see that face.

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Well, right now we can't see that face, which means that the draft is actually in the wrong direction.

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If we modify this and we flip the pole direction and we say OK, now we can see those faces.

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If we turn on the draft analysis and we rotate this around, the faces are now blue instead of green.

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So even though at first they appeared to be okay because of that green color.

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It is important that we do verify that before we simply send the model off.

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Let's minimize all the folders and go back to a home view.

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And at this point, let's make sure that we save the design before moving on.