Ask Lemmy
A Fediverse community for open-ended, thought provoking questions
Rules: (interactive)
1) Be nice and; have fun
Doxxing, trolling, sealioning, racism, and toxicity are not welcomed in AskLemmy. Remember what your mother said: if you can't say something nice, don't say anything at all. In addition, the site-wide Lemmy.world terms of service also apply here. Please familiarize yourself with them
2) All posts must end with a '?'
This is sort of like Jeopardy. Please phrase all post titles in the form of a proper question ending with ?
3) No spam
Please do not flood the community with nonsense. Actual suspected spammers will be banned on site. No astroturfing.
4) NSFW is okay, within reason
Just remember to tag posts with either a content warning or a [NSFW] tag. Overtly sexual posts are not allowed, please direct them to either !asklemmyafterdark@lemmy.world or !asklemmynsfw@lemmynsfw.com.
NSFW comments should be restricted to posts tagged [NSFW].
5) This is not a support community.
It is not a place for 'how do I?', type questions.
If you have any questions regarding the site itself or would like to report a community, please direct them to Lemmy.world Support or email info@lemmy.world. For other questions check our partnered communities list, or use the search function.
6) No US Politics.
Please don't post about current US Politics. If you need to do this, try !politicaldiscussion@lemmy.world or !askusa@discuss.online
Reminder: The terms of service apply here too.
Partnered Communities:
Logo design credit goes to: tubbadu
view the rest of the comments
Have you seen the Sam Zeloof videos? He's the main person I've seen actually build a chip in a garage.
He buys his wafers, which is critical. Given a hot furnace you could refine your own metallurgical silicon in a crucible, but cleaning it will be a whole thing. The machine needed would probably be based on spinning band distillation, which you could make in a pre-existing machine shop. To avoid toxic gases and explosion hazards - which are the two things chemists have told me not to mess with - you'd want to use SiCl4, which is a bit different from the standard approach which uses hydrogenated species. The Siemens process back to silicon and monocrystalline casting is all that's left, and I wonder if they could be combined in a step if scalability isn't a concern.
If only I had space for a workshop, so it's all theoretical ATM.
Which machines are noisy? Polishers?
Ah, not to worry, even professionally it's very common to buy your wafers. I am on mobile data right now so I'll check out those videos later!
Basically, every single machine that needs a vacuum chamber - so almost all non-wet processes, like physical/chemical vapor deposition, reactive ion etching, scanning electron microscopy (although a good optical microscope will do if you're not at the nano scale... Which is almost certainly the case if you're doing things at home).
Honestly maybe I'm just too used to the lab setting and am underestimating how much you can actually do without vacuum processing. I'll take a look later: this all looked so out of the reach of an ordinary person that I never even considered following content creators who do this. Thank you!
I should mention I met someone IRL who makes their own vacuum tubes. You can own your own pump, although I don't know how it would stack up against what you're used to.
High vacuums are tricky. The first high vacuums were achieved with mercury-based Sprengel pumps, but mercury isn't available everywhere. Maybe you could make a small, slow turbomolecular pump work if it was mandatory (it's all about the bearing) but it seems anything that needs sealing is going to struggle without either that or a massive petrochemical industry to supply the needed high-quality synthetic oils. If you're doing technology all over again, I'd skip the vacuum tubes stage because of this.
If you can get away with a low vacuum, a piston-type pump with castor oil as the sealant will do. It seems like a low vacuum would work for at least some kinds of VD. Maybe you can help clear it up a bit.
1 micron features is as ambitious as I've bothered to think about. For basic computing, like to run a CNC machine, that should do.