In this lesson, we'll be identifying 2D and 3D pockets. After completing this lesson, you'll be able to use Measure to inspect a part for process planning and identify a 2D and 3D pocket. For this next lesson, we want to focus on identifying the difference between a 2D and a 3D pocket. For this let's navigate back to the design workspace. Let's hide our stock as well as our vice so we can focus on the part. I'm going to double click the mouse wheel which will fit to screen. I also want to open up the supplied file to deep pocket sample as will be looking at both of these. When we're taking a look at parts and we're trying to identify how to machine them when we're doing our process planning, we need to identify a couple different things. We need to take a look at geometry and identify what tools we need. For example, this part has chamfers on it. These are used to cut the sharp corners of our part maybe for handling purposes or maybe just for cosmetics. So, this tells me that I need a chamfer mill or some sort of tapered tool that allows me to cut that geometry. As we dig a bit deeper more so than just taking a look at the corners or maybe the diameter of holes, we want to take a look at the geometry itself. As we look at this part I can identify a few different things. The first of which, is that the outside shape of it can be problematic based on the geometry these arcs on the top and the bottom. This tells me that I need to hold it at a very specific way in a vise or use some sort of fixture so that I can machine the entire outside contour. Now specifically with this part, we've already looked at creating stock and setting it up in a vise. So, we already know the orientation that we're going to be machining in. The next thing I noticed as I look at this part is that I have a couple of different heights for pockets. I have this first height here which looks to be like a simple 2D pocket. And then I have this next height down here where there are some flat regions. But then we have this dome shape as dome shape is rising up a little bit. If we rotate it around, we've also got this dome shape on the bottom. And then we've got this cut through that goes through that dome shape, but not all the way down to that height. So as we're planning out machining this, I obviously need to have some sort of rounded tool like a ball end mill. Or some sort of tool that can be used to cut this geometry both on the top and the bottom. But then I also need to identify the different areas and heights that I can machine. This first section is a flat face, it's plainer which means that we can sketch on it. We can use it as a section plane, we can do all kinds of things with it. This tells me that this is essentially a 2D pocket. However, if we go to inspect and we create a section analysis, we'll see that at this height at this face, we would actually be machining into the upper portion of that dome. So it's not as simple as creating a pocket down to that height, because we can't just go in and clear it out as if it's a 2D flat pocket. because it'll ruin some of the other geometry. So this is where it gets a little tricky and where we need to do a little digging when we start planning out these parts. If we take a look at the other file 2D pocket sample, this is a little bit more straightforward and easier to identify the areas. In the upper section, we have a pocket here that's completely closed and completely flat. The criteria when we're looking at this part would be identifying the corners so that we know what size tool we need. We can use the inspect measure tool and identify the radius of this, we can see that it's 0.125. Now, this tells me that in the worst case scenario I could take a quarter inch bit into that corner and machine it as a slot. But that would potentially produce some chattering. So I'll need a smaller end mill in order to get into that corner and produce a nice surface finish. We also have a situation where we need to be mindful of the distance between this area here. So we've got 0.375 between this wall and the outside of this boss. Which means that we can do some roughing with a quarter inch end mill or potentially a little bit bigger. But anything bigger than that, we're not going to have enough space to cut through there. So, these are the things that we want to look at and identify when we start to plan out these parts. Also note that we have some pockets in the bottom section of this part. And we need to identify a couple things here, the radius value and how deep this is. So, if we measure the depth here, we need a tool that can cut at least three-quarters deep in order to cut that entire wall. And we need to make sure that the tool is extended out of the holder far enough so we don't collide with the part. We also need to be mindful of this edge here because we're going to have to cut around it section with a ball end or a bull end mill, something that has a radius on the corner. So, this is a fairly large radius, a quarter inch, so we could take a fairly substantial ball and mill and cut that geometry. Of course, we'll get to that when we start to program these parts. But these are the things that we need to identify as we start looking at parts and start planning out our tool paths and our tools. If we rotate this part around, it has a pocket on the other side. And these are actually to completely enclose pockets that are 2D in nature, but at two different depths. You can see this one has a tapped hole that goes through it. But again, we would identify the same things, there are radius value in the corners. So we know what our final finishing tool needs to be as well as the depth the tool needs to be cutting. So in this case, if we were to measure this depth, we wouldn't be able to simply grab this edge. We would need to use an inspect to go from this phase all the way to the bottom of the part. Now in this instance, it's 0.875 and also keep in mind that there will be additional stock. So, as we look at this part, we need a tool that likely can cut at least an inch deep to make sure that we have enough clearance between the holder as well as our stock. So, everything looks good here so far. We've got a couple different parts that we can focus on for our 2D pockets, different areas for 3D pockets as well. So from here and since we made a slight change to this file, I'm going to go ahead and bring back my vise in my stock, go back to a home position. And I'm going to go ahead and save this before moving on to the next step.
