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DanielleFong's profile
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@DanielleFong

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Empire of the Future
Joined February 2008

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    1. Michael Chapiro, Esq., GMI, GFY‏ @mchapiro 27 Jun 2020
      Replying to @DanielleFong @LauraDeming

      They certainly cannot or those titanium parts would not be flying (you might have stiffness-dominated aluminum parts not yet replaced with a chopped fiber composites). Composite *laminate* structures are ill-equipped for intricate geometries with many fastener locations.

      3 replies 0 retweets 0 likes
    2.  🤷🏻‍♀️‏ @DanielleFong 27 Jun 2020
      Replying to @mchapiro @LauraDeming

      not really "an efficient market" for mechanical components yet, but you're right that chopped fiber composites aren't great. Composite laminate structures are more limited yes but more complex geometries are possible Arevo Labs is doing remarkable things. https://arevo.com/ pic.twitter.com/yow46JIE9F

      1 reply 0 retweets 0 likes
    3. Michael Chapiro, Esq., GMI, GFY‏ @mchapiro 27 Jun 2020
      Replying to @DanielleFong @LauraDeming

      Well, yes, if you include stuff that's starting to get commercialized Mantis Composites estimates 70% typical weight savings over machined metals. Alas, Arevo does not know what it's doing and is cringeworthy. I can't go too much into their poor understanding of the markets...

      2 replies 0 retweets 0 likes
    4. Michael Chapiro, Esq., GMI, GFY‏ @mchapiro 27 Jun 2020
      Replying to @mchapiro @DanielleFong @LauraDeming

      But I can point out that it is not much more than a new automated fiber placement (AFP) machine, something that already existed. It's not "3D printing". 3D printing requires tight turns for that millimeter scale manipulation and AFP doesn't offer that.

      1 reply 0 retweets 0 likes
    5.  🤷🏻‍♀️‏ @DanielleFong 27 Jun 2020
      Replying to @mchapiro @LauraDeming

      Seems a little limiting but ok. Worth preserving 3d printing as a technical term rather than a marketing term lest it be the new "quantum" IIRC the idea behind Arevo is this laser heating of the filatment and then pressing it into the thermoplastic / fiber matrix. Seems newish?pic.twitter.com/3v6IEX1c1G

      1 reply 0 retweets 0 likes
    6. Michael Chapiro, Esq., GMI, GFY‏ @mchapiro 27 Jun 2020
      Replying to @DanielleFong @LauraDeming

      That has existed for a while. The version with wider (often 12 inch) spools is called automated tape laying and is used to make large aircraft structures. Thousands of references in Google Scholar, including use of lasers prior to 2015. https://scholar.google.com/scholar?q=automated+fiber+placement+laser+heating&hl=en&as_sdt=0%2C33&as_vis=1&as_ylo=&as_yhi=2015 …

      1 reply 0 retweets 0 likes
    7.  🤷🏻‍♀️‏ @DanielleFong 27 Jun 2020
      Replying to @mchapiro @LauraDeming

      12 inch is pretty different! this is just my view, but the details of getting everything to work together in the system matters, can usually find aspects of past work in every breakthrough design / product. at the time I looked at it had not seen comparably fine structures

      1 reply 0 retweets 0 likes
    8. Michael Chapiro, Esq., GMI, GFY‏ @mchapiro 27 Jun 2020
      Replying to @DanielleFong @LauraDeming

      Slit width tape (down to ~1/8in iirc) existed as well. That's automated fiber placement. Automated tape laying is the one with 12 inch spools. The entire range was available to them. The reason people didn't try to make the sorts of things Arevo is making is that it's not useful.

      1 reply 0 retweets 0 likes
    9.  🤷🏻‍♀️‏ @DanielleFong 27 Jun 2020
      Replying to @mchapiro @LauraDeming

      why is it not useful? This is a very hacker news conversation

      1 reply 0 retweets 1 like
    10. Michael Chapiro, Esq., GMI, GFY‏ @mchapiro 27 Jun 2020
      Replying to @DanielleFong @LauraDeming

      Well I have character limits and confidential info as an excuse. The bicycle is one of their highlights. Now they are releasing an electric bicycle. Drag increases non-linearly and humans are most of the weight. A carbon fiber baby stroller?

      1 reply 0 retweets 1 like
       🤷🏻‍♀️‏ @DanielleFong 27 Jun 2020
      Replying to @mchapiro @LauraDeming

      there’s a large market for carbon fiber bicycles. I agree that it’s fairly silly, most sports goods are, you get so much more for technique then equipment, but you can say the same thing about the automotive industry, or phones. my friends have laid up carbon fiber bikes by hand

      8:54 PM - 27 Jun 2020
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Michael Chapiro, Esq., GMI, GFY‏ @mchapiro 27 Jun 2020
          Replying to @DanielleFong @LauraDeming

          Market for carbon fiber bicycles is for bikes that offer higher performance than the alternative and these are worse than an ordinary carbon fiber bike frame. The market for Arevo's bike is a handful of VCs. Large market doesn't equal startup opportunity. Marginal value needed.

          1 reply 0 retweets 0 likes
        3.  🤷🏻‍♀️‏ @DanielleFong 27 Jun 2020
          Replying to @mchapiro @LauraDeming

          😆 so what are you selling

          1 reply 0 retweets 1 like
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