sb0 changed the topic of #m-labs to: ARTIQ, Migen, MiSoC, Mixxeo & other M-Labs projects :: fka #milkymist :: Logs http://irclog.whitequark.org/m-labs
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<sb0> whitequark, sure
<whitequark> sb0: ok
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<GitHub72> [artiq] whitequark pushed 1 new commit to master: http://git.io/vlvfY
<GitHub72> artiq/master 62419c0 whitequark: manual: update installing.rst.
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<GitHub27> [artiq] whitequark pushed 1 new commit to new-py2llvm: http://git.io/vlvTZ
<GitHub27> artiq/new-py2llvm f70f7fb whitequark: Merge branch 'master' into new-py2llvm
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<travis-ci> m-labs/artiq#559 (master - 62419c0 : whitequark): The build passed.
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<GitHub52> [artiq] whitequark pushed 1 new commit to master: http://git.io/vlvCy
<GitHub52> artiq/master ff93e3c whitequark: manual: update installing.rst to elaborate QC1/QC2 differences.
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<travis-ci> m-labs/artiq#560 (master - ff93e3c : whitequark): The build passed.
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<sb0> whitequark, so you were right, the chinese forepump i have uses npt 1/4
<whitequark> it's even in hong kong
<sb0> I just received one from magnox, and that cost $8
<sb0> haven't put teflon tape yet, and it's very leaky - tried pump oil but it just got sucked in
<whitequark> yeah, oil or grease don't work there
<sb0> well, a bit more than $8
<whitequark> hmmm
<whitequark> no check valve
<whitequark> my pump originally featured a check valve on the NPT 1/4" to SAE 1/4" connector
<whitequark> SAE 1/4" being the one used in A/C loading hoses the pump was targeted for
<whitequark> which prevented oil backflow
<whitequark> sb0: oh btw, another thing you could do is epoxy it in place
<whitequark> which is what my pump came with, presumably because ptfe is expensive (?)
<whitequark> should work as well if you get oil off
<sb0> I'm trying to avoid epoxy now...
<whitequark> ehhh it came off with some force on a wrench
<sb0> in addition to making a mess, epoxy develops minuscule cracks when handled a bit roughly, that result in small and very annoying vacuum leaks
<whitequark> have you seen the large chamber i had made? https://pbs.twimg.com/media/CSXh1p-WIAAEwPL.jpg:large
<whitequark> ISO100 on the bottom, ISO250 on the top
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<whitequark> I've contracted everything out, it cost me $810.95 all in all
<whitequark> from drafting to welding
<sb0> nice
<whitequark> will ship to some guy on twitter
<sb0> what is the valve between the forepump and turbopump for?
<sb0> oil containment?
<whitequark> I've just checked it and without any cleaning (it has lots of fingerprints) I can pull 2.7e-6
<whitequark> torr
<whitequark> I'm pretty certain that is the vapor pressure of skin oil
<whitequark> will chemically polish it with that insane pickling solution (H2SO4, HNO3 and HF) which will also take care of that p well
<whitequark> and should reduce outgassing overall
<whitequark> the valve is that valve I told you about. mainly oil containment yes.
<sb0> well I tried a similar thing, and the oil mess in the foreline was pretty bad
<whitequark> this valve, when it closes, opens the forepump side to air in ~2s
<sb0> ah
<whitequark> so the foreline stays clean
<whitequark> it's built specifically for this application.
<whitequark> oh and another benefit is that it fails closed and saves you if you lose power abruptly.
<whitequark> I'm very fond of it
<whitequark> though I guess none of that matters with a scroll pump anyway
<sb0> I found a chinese manufacturer of scroll pumps
<sb0> they cost $2.5k, with the risk that they might be crap
<whitequark> there are plenty scroll pumps on ebay that cost $2.5k and are unlikely to be crap
<whitequark> e.g. edwards refurbished
<sb0> the nice thing about the cheap stuff is you can try different suppliers easily, and stick with the good ones
<sb0> the magnox stuff is excellent for example
<whitequark> yeah but $2.5k is not cheap
<sb0> the angle valve came from here
<sb0> also good
<sb0> hadn't tried them before
<whitequark> this is nice
<whitequark> very cheap butterfly valve
<cyrozap> _florent_: Looks like an off-by-one in the addressing? Or am I reading it wrong?
<whitequark> has no dead volume, I recommend trying this one
<sb0> oh, they had that npt adapter at half the price of magnox...
<sb0> hm, no, not 1/4
<sb0> how do butterfly valves rotate without damaging the seal?
<whitequark> often a bellows and a mechanical linkage is used
<whitequark> but, seemingly not in your case
<sb0> ah. depending on the design, either the seal takes the friction, or there is some device that displaces the disc when the valve is opened
<whitequark> wow these are cheap.
<whitequark> why have I never looked at them before
<whitequark> ah no, that's just an outlier
<whitequark> an ISO200 valve for $100
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<cyrozap> _florent_: Here's the code that generated the output: https://github.com/cyrozap/misoc/commit/7a41581b93371801e95cb534c6f5d4fd5bb21638
<sb0> i wonder if get-trade-hk isn't just buying vacuum stuff off taobao, multiplying the price by 2 to 5, and selling it on ebay :)
<whitequark> I'm pretty certain some of these do
<whitequark> I wonder what LinVAC does
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<sb0> "The unit powers-up and draws up to 750mmHg of vacuum"
<sb0> hum
<sb0> I had a look at a dumpster-dived scroll pump at electrolab, which was pulling 0.1mbar... turned out the seals inside were completely wrecked
<sb0> they had pumped some sort of dust with it
<GitHub73> [artiq] sbourdeauducq pushed 3 new commits to master: http://git.io/vlflK
<GitHub73> artiq/master 0e375e4 Sebastien Bourdeauducq: gui: fix shortcut pipeline
<GitHub73> artiq/master 2c77c80 Sebastien Bourdeauducq: master: expose more scheduler APIs to the experiments
<GitHub73> artiq/master e6b230b Sebastien Bourdeauducq: Merge branch 'master' of github.com:m-labs/artiq
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<whitequark> huh
<whitequark> 750mmHg is 13mbar
<whitequark> probably their gauge is just shit
<sb0> yes
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<travis-ci> m-labs/artiq#561 (master - e6b230b : Sebastien Bourdeauducq): The build passed.
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<sb0> whitequark, since there has been no 'release' yet, can you remove the artiq package from the main anaconda channel?
<whitequark> done
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<GitHub114> [artiq] sbourdeauducq pushed 2 new commits to master: http://git.io/vlJL4
<GitHub114> artiq/master 58f55fc Sebastien Bourdeauducq: artiq_flash: check that xc3sprog is found. closes #162
<GitHub114> artiq/master 4154366 Sebastien Bourdeauducq: examples/terminate_all: remove debug print
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<travis-ci> m-labs/artiq#562 (master - 58f55fc : Sebastien Bourdeauducq): The build passed.
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<cr1901_modern> sb0: Do you know of any fun SBCs to buy besides OrangePi and the Broadcom Devboard that would have your seal of approval?
<cr1901_modern> (erm, yea RPi doesn't have your seal of approval lol)
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<sb0> cr1901_modern, haven't followed SBCs for a few years now...
<cr1901_modern> Ahhh, I'll probably just get another dev board in addition to miniSpartan
<cr1901_modern> I just remember you mentioning OrangePi earlier this year.
<sb0> yeah, shenzhen or taobao is where i'd go for this sort of thing...
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<whitequark> I'd go to olimex
<whitequark> they also hate systemd, can't go wrong with that
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<cr1901_modern> (While nobody who likes systemd in this room is reading...) Good idea, whitequark :D.
<cr1901_modern> Ahhh, Olimex powers the C.H.I.P. computer, the "first $9 computer that's actually $39." I forgot about that board/was looking into it
<cr1901_modern> no I'm sorry, they were the company that showed C.H.I.P. costs $39. Can't wait for myself to wake up
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<GitHub175> [artiq] sbourdeauducq pushed 2 new commits to master: http://git.io/vlkeo
<GitHub175> artiq/master f3ee97a Sebastien Bourdeauducq: fix typo
<GitHub175> artiq/master b61eb86 Sebastien Bourdeauducq: gui: log freetext filter
* robtaylor has worked on systemd :P
* cr1901_modern grumbles
* robtaylor also worked on hal, udev, dbus
<robtaylor> so you probbaly hate me ;)
<cr1901_modern> not at all. Just last time I brought up a Certain Init System it almost caused an argument
<cr1901_modern> so I waited till people weren't looking
<robtaylor> hehe
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<travis-ci> m-labs/artiq#563 (master - b61eb86 : Sebastien Bourdeauducq): The build passed.
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<GitHub116> [artiq] sbourdeauducq pushed 1 new commit to master: http://git.io/vlqIW
<GitHub116> artiq/master d8b98ae Sebastien Bourdeauducq: gui/log: fix performance problems
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<sb0> whitequark, are you sure the bitstream packages depend on the artiq package?
<sb0> (see mailing list post...)
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<whitequark> let me see
<whitequark> that's extremely strange
<whitequark> run:
<whitequark> - artiq 0.0
<whitequark> oh I see, the old packages were confusing the solver
<whitequark> should be fxed
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