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.
