Brantuk Posted February 29, 2012 Share Posted February 29, 2012 Hi Folks I'm getting one of these: http://www.altairastro.com/product.php?productid=16275&cat=243&page=1 They recomend it should be insulated by sticking something over the top of it to direct heat down onto the mirror instead of releasing heat to the open air. Does anyone hava an idea what I should use? They suggest polystyrene or foam and I'd like to source the most appropriate and effective solution? Have any dob users done this and have a suggestions? Cheers Link to comment Share on other sites More sharing options...
Doc Posted February 29, 2012 Share Posted February 29, 2012 Expandable foam, similar to what you block holes with. Once it makes contact with the air it goes hard. Link to comment Share on other sites More sharing options...
Brantuk Posted February 29, 2012 Author Share Posted February 29, 2012 Thanks Mick - I knew you'd know lol Link to comment Share on other sites More sharing options...
Brantuk Posted March 4, 2012 Author Share Posted March 4, 2012 Is this the stuff Mick? http://www.diy.com/nav/decor/decorating-sundries/fillers-putty/fillers/-specificproducttype-foam_fillers/Polycell-Expanding-Foam-Polyfilla-0030010-Yellow-9254224?utm_campaign=bazaarvoice&utm_medium=SearchVoice&utm_source=RatingsAndReviews&utm_content=Default Link to comment Share on other sites More sharing options...
Doc Posted March 4, 2012 Share Posted March 4, 2012 It is and I mentioned it as I saw a post on CN's about it. They made up some sort of mould so the foam ended up in a nice semi circular shape over the ring of the heater. If you don't it might look a mess. Put in a search on CN for split heater foam or something like that. Link to comment Share on other sites More sharing options...
Brantuk Posted March 4, 2012 Author Share Posted March 4, 2012 Exactly what I was wondering - how to shape it - I remember your's looked quite smart and well shaped - plus it has to be painted black before fixing in place - thanks again matey Link to comment Share on other sites More sharing options...
Doc Posted March 4, 2012 Share Posted March 4, 2012 I didn't use that stuff Kim, I made mine from layers of sticky tape. How about plastercine modeled into a sausage shape surrounded by stcky tape and secured over the ring heater and stuck down. Link to comment Share on other sites More sharing options...
Brantuk Posted March 4, 2012 Author Share Posted March 4, 2012 Interesting idea - I'll think about that one. Meantime I nearly have the flocking corrections finished - one 3" strip left to do - and the d/s focuser is fitted - gonna be a well mod'ed dob when I'm done It's taken a long time cos when you pull the protostar out it takes just the top layer leaving a residue of sponge stuck hard to the surface that has to be scraped out bit by bit ugh! Link to comment Share on other sites More sharing options...
Daz Type-R Posted May 3, 2012 Share Posted May 3, 2012 Did you do this mod in the end Kim? And what insulation did you go for? Just asking as I will be looking to add dew prevention to my Telrad, finder scope, secondary and focuser in the next 3-4 months. Found a proper heater pad for a Telrad, would like the heater pad you found above for the secondary, just wondering what is best for the focuser and the finder scope, just wrap around pads? Also going for the Hitec astro 4 channel dew controller. All ready got my power requirements sorted thanks to Baz. Link to comment Share on other sites More sharing options...
BAZ Posted May 3, 2012 Share Posted May 3, 2012 I reckon we are going to have the most modded Dobs about. Short of solid fuel boosters there's not a lot else we can do. Just need the cloud sorting now, that's where we come unstuck! Link to comment Share on other sites More sharing options...
Daz Type-R Posted May 3, 2012 Share Posted May 3, 2012 I'm working on a mod for that. Lol. Link to comment Share on other sites More sharing options...
Brantuk Posted May 3, 2012 Author Share Posted May 3, 2012 I have it Darren but not stuck it on yet - only just got the silicon glue - found it in Maplins. The expanding foam comes in v large quantities and a bit expensive in B&Q so I'm looking into a cheaper alternative. I think the split ring is for 300P secondary sizes and upwards. Might be oversized for a 200P. Must be able to get smaller ones though I would think. Link to comment Share on other sites More sharing options...
Daz Type-R Posted May 3, 2012 Share Posted May 3, 2012 Cheers Kim, will have a hunt around for a smaller size. Link to comment Share on other sites More sharing options...
Doc Posted September 16, 2012 Share Posted September 16, 2012 Any update on this Kim, as I'm most proberly going to get one soon. Link to comment Share on other sites More sharing options...
Brantuk Posted September 18, 2012 Author Share Posted September 18, 2012 The ring just fits the 300P with a tiny bit of overlap but not a problem - still not fitted mine yet though Mick. Link to comment Share on other sites More sharing options...
Doc Posted September 18, 2012 Share Posted September 18, 2012 Is there another size smaller as by the time you get your insulation around it you might block the light path, I wonder if a 200 or 250 is smaller. Link to comment Share on other sites More sharing options...
+RonC Posted September 19, 2012 Share Posted September 19, 2012 Following this thread with great interest, but CN has confused me? Link to comment Share on other sites More sharing options...
Daz Type-R Posted September 19, 2012 Share Posted September 19, 2012 Is there another size smaller as by the time you get your insulation around it you might block the light path, I wonder if a 200 or 250 is smaller. Mick, I have checked with many astro shops, those that do the Kendrick split rings all say the same, the 300P is the smallest they do. I looked for ages but there is nothing out there really for us 200P owners, I had a long talk with Nick I think it was at Green Witch, he had a few ideas, also spoke with someone at Altair Astro about Kendrick designing one, but that would take months/years to develop, build and then ship! For me, it's a diy job I`m afraid. Link to comment Share on other sites More sharing options...
Doc Posted September 19, 2012 Share Posted September 19, 2012 Kim the next time I see you can I just try the heater on my 300P secondary, I want to get some idea before I buy one. Link to comment Share on other sites More sharing options...
Brantuk Posted September 19, 2012 Author Share Posted September 19, 2012 Sure Mick - not a prob - but my memory is lol - pm me a remider next time we have a meet and I'll bring it along Link to comment Share on other sites More sharing options...
+RonC Posted September 19, 2012 Share Posted September 19, 2012 Can someone tell me what CN is please?? Link to comment Share on other sites More sharing options...
Brantuk Posted September 19, 2012 Author Share Posted September 19, 2012 Cloudy Nights forum? Link to comment Share on other sites More sharing options...
Doc Posted September 19, 2012 Share Posted September 19, 2012 Cheers Kim just want to see how well it fits. Link to comment Share on other sites More sharing options...
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