In this lesson, we're going to rough and finish a closed pocket. After completing this lesson, you'll be able to, create a sketch to define a closed contour and analyze an adaptive versus a traditional pocket operation. In Fusion 360, we're going to carry on with our optical pickup finishing. In this case we've already created a 2D contour to take care of the outside of the part. We've both roughed and finished it and now we want to work our way inside. We haven't done anything to remove material from the top of the part, so we're going to do a quick facing operation by selecting 2D and 2D Face. I'm going to use my half inch flat, I'm going to let it use the stop contour and it's going to automatically pick the top of our part to go down. I'm not going to adjust anything else, I'm going to use it as default and let it go ahead and take the stock down to the top of the part. The next thing that I want to do is create an operation to take care of the pocket on the inside where the four mounting bosses are. To do this, I'm going to start by taking a look at it from the top. Remember when we inspected this part, we noted that it has this opening between the two separate regions. We don't want to treat them as one big pocket as if we selected the bottom face. So we really want to take a look at how we can use geometry or sketches to help create a closed region on the left hand side so we can focus our attention there. If we take a look inside of the model and expand it until we get down to the sketches folder, notice that we have several sketches that were used to define the geometry. If we take a look at some of these, we can see that sketch 2 was for the top opening. And if we take a look at sketch 2, we can see exactly what the geometry looks like. If we take a look at sketch 3, sketch 4, 5, 6 and 7, you can see that we get a good idea of what all of these separate sketches were. Now in our case, sketch 2 is going to be the best representation. If we temporarily hide the body, we can see exactly what sketch 2 is. Notice that inside of sketch 2, we aren't able to select anything right now. Let's bring the body back with sketch 2 visible and let's talk about the next operation we want to use. We've already taken a look at 2D contour and we've talked about how it doesn't have that consistent chip load. Since we've already machined the outside, I now want to be a little bit more careful about loading the part. So I'm going to use my 2D adaptive clearing over a 2D contour or a 2D pocket operation. I'm going to carry on using this large end mill to remove as much material as possible while keeping that consistent chip load. For my geometry, I want to make sure that I select the pocket region. And again notice that as I hover over these areas it wants to grab everything from the bottom face, and really what we want is to grab this upper edge in this case of sketch 2. Once we select that, notice that it's trying to machine the outside. I'm going to left click on this red arrow to make sure it knows that we're machining inside of this region. So using that chain allows us to focus our attention inside of this area. However, as we're looking at this, note that it is the entire pocket including these bosses. So we won't be able to go all the way down to the bottom. For our heights, instead of using our selected contour, we want to use a selection. And in this case, I'm going to hold down the left mouse button and I'm going to select the face of one of those pats. At this point we can go ahead and hide sketch 2 as we don't need it right now. Now that I have this information, I'm going to say OK to all the rest of the default settings and see what gets created. So now it creates a single depth pocket operation using our adaptive clearing. It is leaving that wall behind and we have the small stock to leave, and notice that we have material left in the corners where this tool just can't get. Because we want to minimize the amount of tool changes we have, we want to go ahead and we want to create another 2D adaptive cutting all the way down to the bottom. But remember our sketch 2 doesn't go down that far and we have these bosses that we have to contend with. So what I want to do because our 2D operations are not model aware, is make a sketch that allows me to create that information. This can be done a couple different ways. If we take a look at the utilities, you can see that we've got some actions in here, but there's really no way for us to work on making a sketch. We do have what's called a manufacturing model that we can use. But in most cases I generally go directly back to the design workspace and simply start a new sketch. I'm going to select this bottom face which will automatically bring in those profiles, and then I can use my create arc and use the three point arc to go from this point to this point, and snap it to a tangent orientation. Now while I'm here making this sketch, I'm also going to go ahead and create one on the inside as well. Notice that it's not snapping to that same tangency relation so I'm going to make it a little bit larger. Hit escape, then I'm going to use my control selection to add that tangency. Even though these aren't part of an entire chain, we now have added that geometry we need and we can finish the sketch. And I'm going to rename sketchy to be small arc so that way I can remember just by looking at the sketches. Before I move on, I'm going to do a quick Save and then navigate back to the manufacturer workspace. So now we have sketch 8 or are small arc sketch visible, and we can create another operation. So now we want to create another 2D adaptive clearing. We're going to use that same tool, but this time the pocket selection needs to involve this arc. Notice, if we hover over that arc because the sketch is created using that bottom faces a selection, it automatically is grabbing that chain for us. We do need to select this red arrow again to flip the direction or the side of the cut to make sure that we are working inside of this pocket. For the height, it's going to be based on that selected contour so we don't need to make any changes. We do still want to leave stock because we do want to finish the walls. However, for Axial, I want to go ahead and machine the entire bottom, so I'm going to set that to zero. Then I'll say OK, and allow it to cut that geometry. Now you can see that we've managed to go all the way down to the bottom and we have some material left behind that we'll have to clean out with a 2D contour. But we've done most of the work in getting rid of all of that material. Now that we have both of these operations, if we want to make any adjustments to the way in which it approaches them, we can make those changes now. Well, the first thing that I like to do is go ahead and simulate to make sure that we understand the workflow. We can hide the small arc now and we can play through allowing it to do its outside contour. Then I go back and I face the top and then work through those two adaptive clearings. Some changes that I might want to make is I might want to reduce the helical entry based on that operation. Noticing that it's starting pretty high and it's wasting a lot of time coming down. So if I want to make changes to that operation, I can simply go back into Edit, go to its heights and tell it that the top height is a bit lower. Instead of using the stock top, I'm going to use a selection and say that we're starting from this pad. I'm going to say, okay, allow it to regenerate, and now that helical entry is going to be a lot closer. If we turn on our leads and our links, you can see now it's starting that helical entry really low. It's starting it roughly where the stock top is, and once again we want to make sure that we go back in to simulate and just check that. So now we face, we do our first adaptive, now the tool plunges down, and then it starts at the local entry just above that stock based on some of our other clearance heights. It's moving around, it's clearing out that, and then we can just simply make sure that everything looks good. Close this, go back to Home View and then I always like to make sure that I Save before moving on to the next step.
