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Building a custom octocopter from scratch with no prior hardware experience

karolina.mgdubiel.com

91–98 of 98 posts

Re: Building a custom octocopter from scratch with no prior hardware experience

#91

This is cool as sugar! I have to ask though, how many end mills did you go through milling G10 fiberglass and carbon fiber‽ I've heard the dust from carbon fiber is second to asbestos for inhaling.

Also there was a video about touching the edges of carbon fiber where it is not surface treated is embedding countless small shards of carbon into your skin, only visible through magnification, which cannot be healthy..

We shed the outer layers of our skin fairly often so I don't imagine it would be a big problem unless they were pushed deep enough maybe?

Re: Building a custom octocopter from scratch with no prior hardware experience

#92

Amazing: I'm watching lots of homemade builds atm. I've got a question: why CNC milling and not just FDM 3D printed parts? TFA doesn't talk much about it except saying she went to a machine shop. > 2. CNC milling forms out of G-10 fiberglass (arms) and 5mm carbon fiber (body) TFA also says this: > The solution for this is to 3D print a 0-tolerance assembly jig to hold the arms in perfect position while the center of…

3D printing isn't stiff enough for a larger drone like this, you'll get flex which will upset the PID loop and cause it to be very unstable if it even flies at all.

You'll notice on your 3D printed drone link that the actual multirotor part is carbon fiber tubes. The motor mounts and other brackets can be 3D printed without issues.

Re: Building a custom octocopter from scratch with no prior hardware experience

#93

Cool project! For a DIY beginner, what would be a good starting point for a "normal" drone/octocopter project?

Hi, thank you!! There's so many great resources for building your own quad from scratch (ex https://www.youtube.com/watch?v=S9dvDU5RmQU&t=476s). I honestly wouldn't recommend an octo unless you have a reason for it (like wanting more fault tolerance, etc) solely because it's twice as expensive for the motors. I got all my parts from GetFPV and Amazon. At the very bare level, all you need is a FC, ESC, frame, props, motors, receiver, and battery (plus controller, and goggles/camera if you want it to be FPV)

Re: Building a custom octocopter from scratch with no prior hardware experience

#94
post #78

Earlier quoted context omitted.

[flagged]

We all have access to AI. If we want to ask AI we will. Some people prefer asking actual people since - especially here - there are experts that can answer that question. LMGTFY was a snarky and rude answer, but typically led to an actual source. "Here's what AI said" is even ruder because you aren't saying "here's the obvious place to find the actual answer", you are saying "I'm not an expert either, so here's a com…

I mostly agree with you.

> Some people prefer asking actual people

We all love to do that.

So far those experts have not yet answered. I did. In my experience experts find it rude and tiring to be asked questions if it appears that the questioner hasn't done the basics for themselves. "How To Ask Questions The Smart Way" by Eric S. Raymond and Rick Moen seems relevant: https://archive.ph/duRkf

> Just saying to ask AI is the most useless and rudest response of all

Most definitely rude.

But unfortunately useful.

The AI answer I got appeared plausible to my very basic engineering taste.

It is unfortunately true that AI can give better answers than many HN users.

Obviously AI doesn't usually beat an expert answer.

===

To go meta: is up to Tossrock to become the expert they want by learning the metaskills they need.

I actually thought Tossrock's question was really interesting.

There underlying problem is that we have no polite way to suggest someone try AI. RTFM was historically impolite too.

And posting an AI response (even if filtered and edited) is socially destructive.

FYI: The answer given was something like an outer ring would interfere with lift twice as much, plus that putting weight at rim causes more inertia affecting control. I suspect there's a better question about just using a very fine cable (which would give rigidity without much interference with downdraught). I also suspect that we evolve optimal configurations, and that the underlying reasons are often unclear, and I'm left with too many questions that only an expert could answer.

Re: Building a custom octocopter from scratch with no prior hardware experience

#95
post #94

Earlier quoted context omitted.

We all have access to AI. If we want to ask AI we will. Some people prefer asking actual people since - especially here - there are experts that can answer that question. LMGTFY was a snarky and rude answer, but typically led to an actual source. "Here's what AI said" is even ruder because you aren't saying "here's the obvious place to find the actual answer", you are saying "I'm not an expert either, so here's a com…

I mostly agree with you. > Some people prefer asking actual people We all love to do that. So far those experts have not yet answered. I did. In my experience experts find it rude and tiring to be asked questions if it appears that the questioner hasn't done the basics for themselves. "How To Ask Questions The Smart Way" by Eric S. Raymond and Rick Moen seems relevant: https://archive.ph/duRkf > Just saying to ask AI…

> Most definitely rude.

> But unfortunately useful.

You didn’t answer the question originally and it therefore wasn’t useful at all. All you did was tell them to use AI with an attitude.

If you recognize that it is a rude way to answer, and you add nothing to the conversation, just don’t do it.

How to ask a good question is great knowledge, thanks for the link. How to give a good answer is even more important. Paraphrasing AI as a non expert is an anti-pattern for a good answer. Please stop.

If you can look at your original response and think “everyone would be better off without”, you should not post it.

Re: Building a custom octocopter from scratch with no prior hardware experience

#96
post #24

Earlier quoted context omitted.

Interesting - thanks! OP's drone IS using RL and that's what jumped out at me - it felt a bit overkill for the usecase.

Hey! This is a great question because RL is overkill for my use case, you're right! The reason I'm using RL is because I wanted an RL project on real hardware, so I built this idea of a drone project around that concept, not vice versa. A lot of people on X have brought up alternative solutions -- like MPC -- that might be a better approach to this problem engineering-wise. I just really wanted a real-world RL proble…

That makes total sense, I never meant this in a negative way! I really like your project and am following along now, good luck!

Re: Building a custom octocopter from scratch with no prior hardware experience

#98

I do not notice that the time of posts is reversed haha. I am confused whether you had build it. Thank you, it's cool!

Newest is at the top :D If you press the little "Collapse All" button on the top right of the blog posts, you can see the full timeline + dates of the entries. I did start by designing/building a regular FC (no RL or anything) and am doing RL training afterwards, so I agree that the whole timeline looks a little confusing without background context since it goes real drone --> sim haha

Thank you for your reply. it is a good reading experience, too. :)
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