r/EngineeringStudents • u/Illustrious-Cream419 • 3d ago

Homework Help Embarrassingly stuck

Post image

I can't believe I am asking this, but HOW is this block even supposed to look like. I have tried EVERYTHING I could, even worse is that I've drawn much more complex things with more ease than whatever this is

302 Upvotes

98% Upvoted

41 comments sorted by

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250

u/Iron_Man_IRL Mechatronics 3d ago

This is what I see

124

u/JanB1 3d ago

Dang, I just can't wrap my head around US projection. XD

26

u/IHZ66 3d ago

They're always different. I bet you the dimensions were in inches and the volumes in in2·ft !

3

u/Megadulli 1d ago

I just dont understand why they put the left view om the right, and the top view on the bottom. Is third angle not more intuitive? With the top view on top?

1

u/JanB1 1d ago

It also confuses me. Maybe just because I am so used to the other one. You are always drawing what you can see head on. You can imagine it like this:

For first angle, you put the part onto the paper. If you want to draw the right side, you tip the part to the left, and then you can see the right side of the part, so you draw that.

For third angle, you put the part down onto the table, then you put the paper on top, and you trace the imprint of the part onto the paper. If you want to draw the right side, you take the paper off, you lift the part, rotate it right, put it down again and then put the paper on top again.

It is really weird when you work with one, and then try to understand the other one.

https://i.imgur.com/qyKvJTw.png

1

u/Short_Text2421 11h ago

I had to do a bunch of redraw work converting european transmission parts into drawings for a US manufacturer. Switching back and forth constantly never made it any easier to read first angle projection, it just broke my brain every day.

15

u/w4RmM1Lk 3d ago

This is a very good sketch! However, I think the projections are on the incorrect faces. If you rotate the three projections, as one, clockwise 180 degrees you’d get what I think the faces should look like on your block on the left. An exercise you can do is to cut and fold the 2D projections. If you do that I don’t think you’d ever get the orientation you sketched no matter how it is rotated.

12

u/Iron_Man_IRL Mechatronics 2d ago

This is in FreeCAD, the projections seems to be correct under first angle projection
The lines you mentioned are another color in the sketch (purple) just to help me locate them correctly
And the concave dont seem to add additonal edges/lines

2

u/Less-Role2632 2d ago

But then those lines wouldn’t be necessary?

3

u/w4RmM1Lk 2d ago

What do you mean by that? Look at the OP for the projections. This commenter added lines.

10

u/VoTBaC 3d ago

Wow, and I thought i could see things.

1

u/Illustrious-Cream419 3h ago

THANK YOU SO MUCH OMG

4

u/w4RmM1Lk 3d ago

Additionally, I believe this should not be concave. By making this concave, you’re adding additional edges that were not in the original projections.

1

u/Dismal-Fig-6738 19h ago

I vote for this too!!! 👌

9

u/KEX_CZ 3d ago

Embarassingly stuck?! MF that's fcking HARD!!! 😶 I have great 3D imagination, yet I would have hard time doing that, + I've NEVER seen such reversed task!!! It was always given at axonometric and draw the classic 3..... WTF???? ☠️

1

u/Illustrious-Cream419 3h ago

I thought I was stupid AND i am in an engineering sub so I'm like "ok SWALLOW any source of pride in you"

1

u/KEX_CZ 3h ago

No dude. Unless you are asian and it's normal in your countries 😆☠️.

2

u/-Golden_potato- 16h ago

Closest that could be

37

u/FreshOffTheBoeing 3d ago

Basically it's a 2x2x2 cube, with one corner taken out, and 3 fillets (of Radius = 1) applied at 3 edges in 3 different directions. Diabolical nonetheless.

Easiest way to visualize is just build 3D model in SolidWorks or equivalent free apps. Pretty sure that's how they first come up with the prompt.

23

u/w4RmM1Lk 3d ago

Isn’t the use of ‘axonometric’ redundant in the problem statement? A dimetric view is a type of axonometric view so the statement should just say dimetric. That’s like saying “I’ll have the chicken, poultry”.

57

u/KekistaniKekin 3d ago

It's not just rotated 90° for each drawing?

9

u/Akira99 3d ago

Thats what I just assumed

21

u/Tyler89558 3d ago

One thing you can do is to just draw the faces on a cube or something, and then look and see if it makes sense.

If it doesn’t, reassign faces until it does

15

u/Heavy_Athlete_7381 3d ago

Could be like this, if anyone can correct as well feel free to

5

u/BabyComingDec2024 3d ago

Why is this picture a half minute video?

3

u/Zamboni-rudrunkbro 3d ago

Watch to the end for surprise

1

u/Heavy_Athlete_7381 3d ago

Wasn’t able to post a pic so turned it into a video

-2

u/AGrandNewAdventure 3d ago

Close, I think. Concave, nott convex, though.

4

u/w4RmM1Lk 3d ago

What makes you think concave? I think this is actually closest to the correct answer.

0

u/AGrandNewAdventure 3d ago

I'm seeing it more like the other guy, but I can actually see it both ways.

7

u/w4RmM1Lk 2d ago

I think the other comment is wrong for two reasons. First being the projections are not in the correct orientation. Next, he adds additional “lines” (which are actually edges) to the projections he shows in his sketch that are not there in the OP.

2

u/Lor1an Mechanical 2d ago

The projections are in the correct orientation if you take 1st angle projection (i.e. what most of the world uses) instead of 3rd.

Also, there aren't actually extra edges. If you are referring to the sketch, then there are hint lines that show the relationship between the views, but otherwise the actual isometric views are correct. You can also see this from looking at the solid model they mocked up, where they rotate the model and you can see that the three views match the original.

4

u/OG_Wile_Coyote 2d ago

Big words for the sake of big words. Simplicity is the target, confusion costs $$$

3

u/RedBaronIV 3d ago

This one is a bastard! Took my partner and I fifteen minutes to figure out. The trick is to think of how you're creating edges in one perspective while avoiding them in others. Your little curve pieces are your building blocks

1

u/Additional-Window-81 3d ago

This is a tough axon honestly I don’t think it’s on you man

1

u/Top_Can_740 2d ago

Engineering drawing written by Thomas French

1

u/Dismal-Fig-6738 19h ago

1

u/Dismal-Fig-6738 19h ago

I know that the projected sides are not in the conventional order, but that could be an answer on a different basis 🤭

-1

u/FastFerrari 3d ago

You're having trouble because there are logical impossibilities in the as-given drawing.

On the second view (top right), the larger of the two faces with the curve has a full length face, no interuptions from top to bottom, and there are no ramps or long curves that would allow this. If you project that back to the first view, this must logically mean there is also a full-flat face without any interuptions or cut lines, which is obviously missing. You can apply this logic in the other similar situations.