Draft analysis - Siemens NX Tutorial

- [Instructor] So I've gone to great lengths in designing our part for injection molding. Now we want to make sure that this part can actually be molded. So, I'm going to go into the Analysis tab and do what's called a Draft Analysis. The way this works is you need to pick the body you want to perform the draft analysis on. So I'm just going to come over here, say Body Faces, select by part, and once I have that next I need to do is specify my vector for my draw. So I'll come in here, specify my vector, again I'll pick my die line. As you can see that die line comes in very handy. It's really important that you set that up. Now that I have my die line set and selected, I can take a look at the gradients along some of these faces. And what I'm seeing is a positive draft angle is up to five degrees. Well I know that I have a three degree draft on those walls, so I want to go and back this off to we'll say 2.9. Often times if I go right to three degrees it'll still show that they're locked, but if I go just below that 2.9, and everything shows positive then we know everything's good. So in this case, 2.9, you can see everything is green, except for these faces here. Okay, so this is indicating to me that these faces are potentially going to be problematic. If I reverse the vector and take a look in the opposite direction, you can see these outside faces. Everything looks just fine here, but it's those inside faces that I know are going to cause me some issues. So this allows me to quickly find and target those areas that I know are going to cause me problems. Or maybe I don't know, and I want to verify that nothing is going to cause me an issue. So, this gives me a quick analysis of the actual bodies. Now, if you play around with some of these numbers, if I come in here and say, no, maybe it's three, you can see what I was referring to earlier where three shows up with showing an issue. So, like I said, I typically go just a tenth of a degree off from the actual positive draft that I need. If you want to see a parting line you can turn on parting line and it'll show you where the parting elements going to be if it's flowing across the edge of a surface. Often times it may be. Right now I know it's right on the top edges here, so I don't have anything to worry about with that, 'cause I was very cautious as far as the way that I defined my draft walls off to the parting surface, as well as making sure that those walls are drafted three degrees to my die line. So now I need to go in and correct my walls on my ribs.