CAD Blog Post

Written by

lawrencel

in

When I started thinking of this project, the first thing that I thought about was making a bottle container for any liquid. However, when I started making the cylinders, I was thinking about why not make it interesting. Therefore, I decided to make an engine, to be specific, not the whole engine with all the details, whcih might be costing months of time, I did the pumping cylinders part.

Part 1

This is the first part of the whole thing, it is just basically creating circles and making extrudes.

Part 2

This is another part using the tool of three point arc to make it symmetrical towards the original cylinder.

Part 3

This is the last part of the body which simply includes two cylinders and the 3 dimension shape that we made on the second part.This part is also the main rotation part of the engine that pumps the pistons up and down.

This is the main part of the project, which is called the pistons, they are the things that goes up and down. I started this part by using the diameter of the cylinder in part 3 to create a circle. Then I created another circle slightly smaller and connected them together. Then used the extrude tool to make it 3d. Lastly using the revolve tool to make the top part.

This is the whole thing connected together

Another view…

The interaction of the whole project will be including numerous ratational parts. First of all, between part 1 and part2 , there should be flexible and ratational. In this case, it can be spinning up and downto create energy. Moreover, the part in part3 that is letting the piston part hold should also be rotational in order to push the piston up. Lastly. the connection point between the part2s and part3s should also be rotational just to make sure the piston can be pushed.

The drawing of the project

The total materials needed:

Revolute mate and fastened mate

In this part I used a fastened mate in order to lock the air outlet part which is the coloured circular ring to the piston since I used different parts for them. Moreover, I used revolute mate to show how the rotational parts actually works.

CAD url: engine | Assembly 1

Conclusion:

This is the first 3D model creating project, I thought I did pretty well on the logic of the whole project. However, I think it will be best if I can add more details to the pistons, or even make it more complicated such as a whole engine of a car.

Comments

4 Responses to “CAD Blog Post”

  1. mcrompton Avatar
    mcrompton

    Wow, Lawrence! This is a great start, especially for someone with no (little?) CAD experience! Having said this, we’re missing some important things for the assignment. First, I would always use a separate part studio for each part. You only ever need to design one copy of the part, because you can insert it multiple times in the assembly. Second, when you get to assembling things, you need to define how the parts interact. Since most of the part rotate in relation to each other, the revolute mate is going to be your best friend here. Third, your mechanical drawing needs to have dimensions. Someone taking these drawing to fabricate your design needs to know how big to make everything! To fit those dimensions into your drawing cleanly, you’ll likely need to use a bigger piece of paper or scale the images smaller (they are currently 1:2, you might need 1:4 or even smaller). Finally, we’re missing the BOM and the transcript of how you used AI. These need to be included in the assignment. Please address these issues and resubmit.

    Reply
    1. mcrompton Avatar
      mcrompton

      Hi Lawrence. I feel like we’re building a pattern here. You read my comments, address one of the last things that I requested, and resubmit ignoring the rest of my feedback. Please re-read my last comment and address all of the issues before resubmitting.

      Reply
      1. mcrompton Avatar
        mcrompton

        OK. It looks like we’re struggling with the mates still, Lawrence. If a feature is red in the features list, this means that there is an error and it is not working. See if you can get at least one of those revolutes to work. You might have to change the design of the hole in the piston. If you need help, please come see me. Could you also embed or link your Onshape document in your post? It makes it much easier for readers to see what you’re working on.

        Reply
        1. mcrompton Avatar
          mcrompton

          OK, Lawrence. You’ve demonstrated how you can use a mate properly. Done!

          Reply

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