Electronics > Projects, Designs, and Technical Stuff

Backyard foundry

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coppercone2:
and it can clog up on you

coppercone2:
I feel like with a turbomollecular pump you can run the semiconductor toxic gasses through it OK. I don't know if you can run a hot turbomollecular pump.

I also don't know how they deal with them, do they just let em into the oil  (pick a nonreactive one) that they gas out of ?


what do you normally do with this shit? maybe the clean gasses can react with something, if you have organic attached to it, it seems like it would soot up? getting some fucking pump oil infused with pyrophoric chemicals sounds like a new recipe for napalm

jeremy:
I’ve always wanted to do something like this, but having HF or pirhana around people who don’t know the dangers (ie, in a garage) worried me too much. That’s not even counting any of the wacky dopants like phosgene, etc.

What do you plan on doing for the vacuum? Chamber, seals, flanges, gauges, etc? Turbopump, diffusion pump, etc? I feel as though it would be easy to burn a big hole in your budget on vacuum equipment alone. The obvious answer is to scavenge on eBay for used stuff, but that basically just means that nobody can replicate your system.

coppercone2:
are you sure your not gonna end up with barrels full of shady ass pump oil? return of the living dead part 2

jeremy:

--- Quote from: blueskull on May 20, 2019, 07:32:29 am ---1. This is supposed to be a dry process. I've dealt with HF. FFS I've also played with TBLi, and no, no thanks.

2. TMP+2 stage mechanical. There are kits online sold by reputable distributors. Apparently factory rebuilt ones are pretty popular, and since it's based on a current model, replicating is possible. For other parts, I can machine aluminum, and I can outsource SS machining if necessary.

--- End quote ---

Could you link a pump kit? I am curious. I look forward to any updates on this project.

Also, what is TBLi? I assume some sort of crazy solvent, but googling reveals nothing useful.

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