Learn what Draft is, why it is useful, and why it is required in plastics design as well as metal casting. Next, learn how to use the Draft analysis tool and apply these tools to the Link2 component that was designed in the previous lessons.
- [Instructor] So, let's look into understanding draft angle and draft analysis a little bit further. So, I'm jumping back to my link two design here and if we remember our link two, we extruded with a specific draft angle. I can start by, again, maybe just jump to a right view and here, I'm seeing that draft angle come in. To simplify this, maybe I'll just roll it back to before my fillet to there and again, remember I can even go into this feature, this extrusion. Take a look at the properties I threw in there. This one's just an extrude of 20mm and it has this angle of 12 degrees or eight degrees, whatever angle we threw in there for our taper angle or our draft angle and this was just for us to help remove the object from, say an injection mold or for a metal-casted mold, whatever it may be. So, let's say we have a draft angle of eight degrees here. I'm going to remove this, just to throw this back down to zero. So, I can change this value at any time, remove it at any time, and of course that's fine and in this case, I'm also going to take a look at one other method of applying this draft angle. So, of course, we can do it in the extrusion feature itself and that's pretty useful, as it's going to apply that draft angle to every face that's being extruded, as we're seeing here. However, there's one other method that we can do, very similar, with the exact same type of draft angle and if I just go to modify here, I will find an actual draft command. So, this just does the exact same thing, adds that draft angle, except you have a little bit more fine control over this. You can specify exactly which faces you'd like to draft and exactly what would be your normal plane that you'd be drafting about and so on. So, just a little bit more manual method and you have a couple more options for you. So, I can choose draft here, again, now I'm defining the parting plane, so how I would be kind of removing this part from a mold, so let's say that might be this face here would be my parting plane and then all the faces that I'd like to apply a draft. So, notice I can grab, essentially whatever faces I'd like here. So, you can see this might be useful in maybe more complex objects, where you have some faces you require draft, some faces you may not require draft or a different draft and so on, and taking a look here, I'll jump to maybe a right view, zoom in a little bit, and just the same, you can see that same draft angle coming in. I can change this value, notice the difference, and let's say again, go with an eight degree draft angle here. I can say, okay, once I'm happy with that. So, really, that's just the exact same thing as we had with the draft we applied directly in the extrude feature. Just another more manual method to achieve that same draft angle. Maybe I'll roll forward to get my fillet back there. Then one other tool that we have available to us here that's very useful is draft analysis. So, if I go to my inspect tools here, I have a draft analysis and this is a very useful tool once you have maybe a finished design or halfway through a design. You can take a look at your design and see which faces may require a draft. So, the body that I'm looking at, in this case of course, I'll select this as my body, the direction as well, and my parting face here. Now, it should show with colored faces, essentially which faces may require a draft or which faces look good. So, for example, let's say my engineering team or my design team or manufacturing team tells me that to properly remove this part from the injection mold or the casting mold, I need a draft angle of, let's say at least five degrees here. So, I can throw in my draft angle parameters here. Negative five degrees, positive five degrees, depending on which directions I'm parting from. Then I can also put in tolerance values, so maybe my manufacturing process has some tolerance between it. So, let's say my engineering team tells me I need at least this five degree draft angle within a tolerance of 0.5 or so and I can say okay. Just taking a look at the color coding here, all the blue faces are telling me that this all looks okay to me. This is indicating that my faces are above that five degree required draft angle, because I've already thrown in that eight degree angle. Let's say my engineering team then changes that required angle. I have my draft still here, my draft analysis. I can jump back into this draft analysis, edit to change, delete it at any time. I see now that my engineering team says I need a larger draft angle, let's say minus maybe about nine degrees or so, plus the tolerance as well. So, now I can see that the draft angle I require is nine degrees and I'm getting some red faces here. So, that's indicating to me that there's potentially an issue. The draft on those faces is not above my nine degrees or my required value. So, it's just indicating that to me as the designer or as the engineer and then if I'm happy with that, my requirement is now nine degrees, I can say okay. So, now as the designer or the drafter or the engineer, I can notice this indication and say okay, I'll of course, need to increase my draft angle. So, I could go perhaps change my draft angle. I know eight degrees is not quite enough anymore. So, maybe I'll change that to a 12 degree draft angle and say okay and now, everything's looking good on my analysis side of things. So, this is a fairly simple part, but you can easily see how draft and draft analysis can be very, very useful tools when we get into more and more complex parts, especially when you're dealing with any injection molding or metal casting designs.
- Designing the base component
- Designing links
- Using the plastics and casting design tools
- Creating a mechatronics assembly
- Routing wire
- Creating the final outputs