this post was submitted on 26 Aug 2023
847 points (94.1% liked)

Technology

60070 readers
4435 users here now

This is a most excellent place for technology news and articles.


Our Rules


  1. Follow the lemmy.world rules.
  2. Only tech related content.
  3. Be excellent to each another!
  4. Mod approved content bots can post up to 10 articles per day.
  5. Threads asking for personal tech support may be deleted.
  6. Politics threads may be removed.
  7. No memes allowed as posts, OK to post as comments.
  8. Only approved bots from the list below, to ask if your bot can be added please contact us.
  9. Check for duplicates before posting, duplicates may be removed

Approved Bots


founded 2 years ago
MODERATORS
 

Tesla is facing issues with the bare metal construction of the Cybertruck, which Elon Musk warned was as tricky to do as making Lego bricks

you are viewing a single comment's thread
view the rest of the comments
[–] FiskFisk33@startrek.website 55 points 1 year ago (2 children)

to build it to that accuracy the car would have to cost millions

[–] over_clox@lemmy.world 55 points 1 year ago (3 children)

To build it with that accuracy would be physically impossible. Guess he forgot about thermal expansion and contraction. Guess he forgot about the weather...

[–] schnokobaer@feddit.de 18 points 1 year ago (2 children)

I mean, it says cybertruck parts, not the whole thing including assembly. Certainly possible for some manufacturing processes under given conditions to produce parts with ±0.005 tolerances like laser cutting or precision CNC machining of small dimensions. But it's obviously completely unrealistic given that most parts for a car will be of large-ish dimensions and stamped, injection molded, cast, forged, extruded... none of which lends itself to IT grades better than 10, far away from talking about microns.

[–] AssPennies@lemmy.world 8 points 1 year ago

Didn't you see what musk said about legos and pop cans? It can be done, the tronk just needs to be built out of legos and pop cans, duh!

[–] over_clox@lemmy.world 2 points 1 year ago

A rumor I've heard somewhere online is that people are noticing the body panels wobbling, or 'breathing' in and out in the wind. Not sure how true that is, I can't find a video showing this happening, but it does make sense. Even the most subtle flexing of a shiny flat surface becomes way more obvious and sticks out like a sore thumb.

[–] phoenixz@lemmy.ca 14 points 1 year ago

Musk is a scammer who has almost no practical understanding of engineering.

He (and unfortunately many after him) forgot about thermal expansion and contraction as well with his dumbass Hyperloop idea. Have a hermetically sealed metal tube with a vacuum run exposed for 200km and let's just ignore thermal expansion. One station would have to move left and right for several meters throughout the day, every day for that, the 200km pipe somehow would need to be able to move about... His "designs" and "ideas" are engineering nightmares

[–] botengang@feddit.de 6 points 1 year ago (1 children)

Nah, not impossible people build stellarator type Fusion reactors with large freeform metal parts in that tolerance region that are exposed to liquid helium.

[–] over_clox@lemmy.world 10 points 1 year ago (3 children)

Does not change the fact that all materials expand when temperature rises and contract when temperature cools. Plus different materials have different temperature expansion coefficients.

[–] HeneryHawk@thelemmy.club 6 points 1 year ago (1 children)

Most. Water, for example, takes up more volume in spaces when frozen

[–] over_clox@lemmy.world 1 points 1 year ago

True, water is weird like that.

[–] botengang@feddit.de 5 points 1 year ago

So does the stellarator. What's the argument here?

[–] FiskFisk33@startrek.website 2 points 1 year ago

just define a temperature :D

[–] roboticide@lemmy.world 11 points 1 year ago (1 children)

Indeed, that's about 10 to 100 times more accuracy than other automakers. Those tolerances just aren't necessary so no supplier is going to have the tools or infrastructure in place to make parts to such a high degree. Body shop alone sees fluctuations in millimeters because industrial robots can't do any better than half millimeter accuracy, if they're brand new.

[–] dohju@lemmy.world 4 points 1 year ago

If you can even get something like +/-3 or 4 mm with say a cpk of 1,33 you are doing pretty well for a whole body.

It's probably a pr stunt. If this is real then they are doomed because they have not yet understood that you need to compensate tolerances and design a robust assembly that can handle this. If you are trying to get crazy high part precision you have not understood how big scale manufacturing works. This is why the Japanese are often so highly regarded in this and might be the true art of car (or large scale) engineering.