One more thing - I would also provide the layout, Dalibor
2013/1/28 Dalibor Farný <dali...@farny.cz> > Hi Michael, > > the numbers for nixi tubes is one of the problem I havent sufficiently > solved yet. Are your laser cutters able to produce numbers that have 0.4mm > wide lines? The material would be 0.1mm thick stainless steel sheet (316L). > > I could send You some sheets to give it a try, just send me your address > ;-) > > Thank You! > > Dalibor > > 2013/1/27 michael gregg <mgregggph...@gmail.com> > >> Sounds good. And yes, other people that have made nixie tubes do seem >> to be getting good results with the level of vacuum that you are >> getting. >> >> Also, I have all sorts of crazy laser cutters here. I may be able to >> come up with a good stack of numbers or other characters if you'd like >> them for your nixie tubes. I have never cut anything so fine with >> these lasers, but according to the manufacturer, I should be able to >> do it. >> >> I am not sure where I would get tiny ceramic separators though. >> >> I am excited to see your results. >> >> Michael- >> >> >> On Sat, Jan 26, 2013 at 6:14 AM, jb-electronics >> <webmas...@jb-electronics.de> wrote: >> > Hi Michael, >> > >> > yes, I will document everything on my website. In fact, most of it is >> > already done, but right now I am writing the vacuum system part and I >> want >> > to document all the steps that I did until now. And now it is far from >> > perfect. So I will show all different setups and number them. My current >> > setup is setup number III. >> > >> > It won't be long ;-) >> > >> > Jens >> > >> > >> >> On 01/25/2013 03:52 PM, jb-electronics wrote: >> >>> >> >>> Hi folks, >> >>> >> >>> I am still working on Nixie tubes, but I have to take it a little slow >> >>> at the moment because I switched my university and I am currently sort >> >>> of living in two cities ;-) >> >>> >> >>> However, today I had some time so I took a look at my vacuum system. >> >>> My problem was that even after I closed the valve to my pump at a >> >>> pressure of 1.5E-2 mbar, the pressure would rise up to 20mbar in 20 >> >>> minutes. So there was a leak. >> >>> >> >>> I then checked every part of my system (swagelok adapter, needle >> >>> valve) by replacing them with a blind flange and recording the >> >>> pressure after 10s, 20s, 30s, 40s, 50s, 60s, 120s, 300s, 600s, 1200s >> >>> and plotted them. I realised that there was insufficient greasing on >> >>> my needle valve, and the most interesting thing is that it is not >> >>> airtight if the scale is adjusted to just zero. You have to (gently) >> >>> adjust it below the scale zero point. Then I get a leakage rate of >> >>> just 1.2 琨ar/s which is very low. >> >>> >> >>> My system has a volume of at most (!) 65ml, so the leakage rate now is >> >>> Q = 5.4E-6 mbar l/s which is pretty good I think. See my results here: >> >>> >> >>> http://www.jb-electronics.de/tmp/leakage.png >> >>> http://www.jb-electronics.de/tmp/leakage_extensive.png >> >>> >> >>> Note that the Q value in these diagrams needs to be multiplied with >> 65ml. >> >>> >> >>> The next step will be to find a good connection to the pressure >> >>> reducer for my gas bottle. Right now I am using a PVC hose (terrible), >> >>> and I have huge leakage rates. >> >>> >> >>> But as always: One thing at a time ;-) >> >>> >> >>> Jens >> >>> >> >> Very cool. >> >> >> >> So the leakage rate seems pretty low, but I'd be concerned about the >> >> total vacuum that your system can accomplish. >> >> >> >> Although I have never built nixie tubes myself, I did a good amount of >> >> research to go down that road. >> >> >> >> My research came up with some claims that you need to get down in the >> >> 10E-6 torr before the fill for good results with a nixie tube. >> >> >> >> Anyhow, please keep a image journal of your work. It looks like a great >> >> deal of fun. >> >> >> >> Michael- >> >> >> > >> > -- >> > You received this message because you are subscribed to the Google >> Groups >> > "neonixie-l" group. >> > To unsubscribe from this group and stop receiving emails from it, send >> an >> > email to neonixie-l+unsubscr...@googlegroups.com. >> > To post to this group, send an email to neonixie-l@googlegroups.com. >> > For more options, visit https://groups.google.com/groups/opt_out. >> > >> > >> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To post to this group, send an email to neonixie-l@googlegroups.com. >> To unsubscribe from this group, send email to >> neonixie-l+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> > > > -- > Dalibor Farny > http://dalibor.farny.cz > > -- Dalibor Farny http://dalibor.farny.cz -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. 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