Join Gabriel Corbett for an in-depth discussion in this video Mass property analysis, part of Cert Prep: Certified SOLIDWORKS Professional (2015).
- Performing a mass property analysis is really how we're going to get the answers to the majority of the test questions on the exam. Now, first things first, we need to make sure we have the correct material. So over here I'm going to look for the material as alloy steel. If I jump over to the exam itself, you can see here that the material is alloy steel, and my density is 0.0077 grams per cubic millimeter. All right, so back to my part. I've got the correct material, and that's great. So now I'm going to come over to Mass Properties, or if you don't have that, go to Evaluate and click on Mass Properties.
Now, my density here is 0.01 grams, because I'm using a two-place decimal. So as a quick check, go up to Options, change it to a four-place decimal to match what SOLIDWORKS has, and notice it's 0.0077, exactly what we're supposed to be. But our answer wants to be a two-place decimal, so let's go back and change that again to a two-place decimal. And here's our value. So I have 13206.36 grams, and if I go back and take a look at the exam itself, I have several different multiple choice options here.
So here's my different options, and I have that 13206, but it's 0.40 and I have 0.36. It's a slight difference, and sometimes you will see a very slight difference on the exam as well. But we want the closest answer possible, and we want to be within the 0.1 error factor. So we are right there, everything looks okay. So the correct answer for this one is going to be B, and that also tells us that we're on the right track when it comes to building our part because we've got an answer which is one of those four. If you don't get an answer that is one of the four multiple choice questions, or extremely close to it, more than likely, you've made a mistake and you should go back and adjust your model, take a look at each and every sketch, make sure you've linked values correctly, and make sure there's not something you've overlooked.
There's a bunch of little things that are very subtle that will affect the part. For instance, if you take a look at this feature here, this little chamfer, it's a very subtle change but they change from a 45 to a 30-degree on that chamfer. It looks almost exactly the same, but if you didn't pay attention to that subtle change in the drawing, you'll get a value that's slightly off. So make sure that you do take a look at each one of those things. The other thing I want to point out for that type of feature is the direction it's going in. So if you click on edge number one, notice it's pointing outwards. But I can also flip that direction inwards, which does change the feature.
So the way they have it defined in the test question is it's a two-millimeter by 30-degree chamfer, facing outwards, so make sure that each one of these, and click on each one and make sure that arrow is pointing outwards for each one of those values. Click Okay, and now we should have the right part. Weigh it, and here's our value. Now, as we modify the part, again, we're going to be asked to take a look at the different changes that can happen and weigh it again. So again, make sure you double-check your material is correct, the weight of the material is correct, and then make sure that each one of those values matches one of the four, because when you go to your next question, which you're probably going to be just modifying your equations here, manage equations, adjust these equations, here they all are, click Okay, and then weigh the part.
And now you're going to have a free response value, so your response value needs to be correct. And if it was correct with the multiple choice, more than likely it's going to be correct for the free response.
He also breaks down the three segments of the test (part modeling, configurations, and assemblies), providing strategies that will help you pass each section. At the end of the course, there are two sample exams to practice what you've learned.
- CSWP requirements review
- Working with sketch entities, tools, and relations
- Using the boss and cut features
- Performing sweeps and lofts
- Smoothing corners with Fillet and Chamfer
- Creating linear and circular patterns
- Setting up equations
- Creating multibody parts
- Setting mass properties
- Working with materials and constraints
- Inserting components
- Setting up reference geometry
- Arranging features to change the part
- Working with suppression states
- Using a design table to build configurations
- Establishing standard drawing views
- Annotating your drawings