To bad spdking is silnenced 
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no wonder why its been so peaceful here lately lmaooooooooooooo
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When I get home Iāll do a bit of calculation, but itās not a question in my mind that a 28cfm vacuum pump will never get below 10^-2 torr.
No diffusion pump or turbomolecular pump? Youāll be fighting vapor pressure for years.
If I were you Iād go for a bigger roughing pump for sureāIām interested to see what ultimate vac you can reach
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that would require such extensive coldtrapping, would be sick af tho
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I mean if you got a 72L vacuum pump you better expect to be cold trapping the shit out of the system.
Also, I feel like Iād smell like the cold tentacles of death after distilling with an E2M28 for (probably) like 8 hours straight and the exhaust blowing straight into the room 
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Probably an E2M80 and blower together is the ticket. I bet it would double his output speed. Definitely needs kf-40 the whole way tho
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Iāll take a photo and video tomorrow.
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Looking forward to itāas @goldleaf_scientific said an E2M80 would keep up very well, but youāll become aware of your CFMs being a limiting factor pretty quickly.
Regardless of the vacuum, this setup is very cool. Congrats
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Kf40 minimum
Youād be surprised at how overblown the turbomecular pump blowup warnings really are- we ran multiple turbos on a Chinese WFE in Nevada and didnāt have any issues,
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theres a ton of energy in thoses rotating blades! overblown? potentially yes, ive seen some abused turbos before, they can take some abuse. however the danger is still there, we had a defective turbo grenade in an old mass spec we had, was a total loss, and a terrifying experience. sciex ended up replacing everything in the end tho!
these arent my pics, but check out this grenaded 10" turbo
if a turbo ever grenaded, and the blades some how escaped containment, then yeah your going to have a terrible, terrible time. turbos are to be respected.
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We ran them 8-9 yrs ago with a stainless steel cold trap and dry ice all day for yrs and never had a problem
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Yeah thatās what we used too-
@RockSteady it trying to downplay what happens when they do asplode but the way I see some folks tiptoe around em is a bit extra
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of fursure, people are afraid of them, ive noticed this at tons of spots! its just another pump, but just with a blender spinning at 60k rpms. follow startup protocol, keep a cold trap cold, and dont hit it with a hammer mid run and youll be fine lmaooo
still one must see potential dangers in the lab and identify them. lots of shit is dangerous tho, and a turbo is no more dangerous then any other piece of gear we typically use.
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I did that whole identifying dangers in the lab thing a few timesā¦
People fucking hate it when you come through and tell them that they are mismanaging their little holes in the wall.
Unless youāre there specifically to address issue such as theseā¦ itās likely not worth it.
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Ya we took precautions and this was way back in the beginning when pope would hang up on you if you werenāt from a university and no company sure as shit wanted me to just come buy one.
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Itās a beast alright!
Not sure which glass got broken on the R&D unit here in OR, but I do recall stopping by one day to hear that it was downā¦
my understanding was that the production head was going to be shorter.
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Ahhh so you know my boy!
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Iām not particularly afraid of being hurt by a turbo failure but my bank account is lol
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The Cyclopath sees all!..
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