Hi Martin. I’m using 1/8 inch thick cast acrylic tube for the light guides and I don’t anticipate any warping/discoloring under continued usage. I haven’t noticed any particular hot spots on the tubes I’ve tested so far, but will keep an eye (finger...:-) out.
Thanks for the heads up. Nick Sent from my iPhone > On Feb 18, 2019, at 10:18, Dekatron42 <[email protected]> wrote: > > Thanks for checking the heat, that explains why I burned my fingers touching > it at the back. > > Will acrylic crackle on the surface at this temperature or is it absolutely > stable? I don't know anything about it just that I've seen some crackled > acrylic near hot tubes and also red acrylic in front of Nixies being warped > by the heat, this has bin some 1-3mm thick. > > /Martin > >> On Monday, 18 February 2019 17:04:25 UTC+1, Sgitheach wrote: >> >> I've had the clock on for a few hours now without it going to sleep. The >> worse case temperature I can measure anywhere is 55degC. Poly methyl >> methacrylate PMMA "acrylic" is good to a working temperature of 80degC and >> melts at 160degC. This doesn't deal with that case you describe with the >> backs of the tube being far hotter. I'm using six "Valvo" tubes but I'll get >> some other tubes out to try. At least I'm not dealing with some cheap >> knock-off Chinese version ;^) >> >> BTW Does any one on the list have an East German clone to sell or swap? >> >> Grahame >> >> -------- Forwarded Message -------- >> Subject: Re: [neonixie-l] Re: "The Fortress " an E1T clock coming soon... >> Date: Mon, 18 Feb 2019 13:41:59 +0000 >> From: Grahame <[email protected]> >> To: [email protected] >> >> >> Right, I understand. I have switched off any sleep function in my test clock >> that has been running 24/7 so the clock won't shut down when the room is >> unoccupied and I'll come back in a few hours and check. The test clock has >> the acrylic columns cut at 45 degrees compared to 22.5 degrees in the photo, >> so more of the back of the E1T is covered. >> >> Back later... >> >> Grahame >> >>> On 18/02/2019 13:17, Dekatron42 wrote: >>> The ones I have that get hot do it closest to the base where the heater >>> wires enter the cathode and where they aren’t shielded. It looks like the >>> round acrylic tube is very close to the E1T, that’s the part I wondered if >>> it was too close. >>> >>> /Martin >>> > > -- > 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 [email protected]. > To post to this group, send email to [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/2d4cf79e-381c-416b-9b1d-d4c927ad0bf3%40googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- 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 [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/65F08C38-D871-4864-9A3F-C454AEECA499%40gmail.com. For more options, visit https://groups.google.com/d/optout.
