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MultumInParvo

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About MultumInParvo

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    Nebula

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  • Location
    Kent
  1. Lots of prep work now done, inclcuding making the door swing inwards, which took a surprising amount of time and effort, but finally levelled the last of the concrete at 9:15 tonight... And not too far off the bubble: I had quite forgotten how bloody hard it is as a solo job even with a mixer, and with 48 bags of ballast and cement in there I'm pretty sure I'm going to ache tomorrow...
  2. Hi Graham, I went with the FH Brundle track and, suprisingly, they were cheaper than anyone, ebay included, and they had all the other bits I needed such as 3m of 12mm threaded rod, again cheaper than elsewhere. Thanks for the pic, I guess I need to get myself some aluminium plate, missed that off my shopping list. The bit I am most interested in is the automation of the system. I am indeed using the one from ebay, and plan to control it with relays and limit switches. Any photo's or diagrams you have of what you have put in, including the position sensors for Ascom would be really helpful. I have a Raspi 3b+ on its way to me, and I am trying to find out about what relay devices are best as the ones I see vary wildly in price from a fiver up to £50, so any feedback here would be happily received. This is the one that seems adequate to my mind: https://www.ebay.co.uk/itm/8-way-8-Channel-DC-12V-Relay-control-board-relays-Module-For-AVR-ARM-Development/152240067348?hash=item2372371314:g:1l8AAOSwxblbPch- Is there anything I need to consider about the types of switches and sensors? I know from other hobbies that microswitches and their actuator leaves can deform over time, so I'm a fan of non-contact methods like magentic contacts used in alarm systems, but not sure whether they are suitable here. All the best, Ian
  3. On the wall/peir height question, I have =been doing some thinking and measuring. The first challenge is that I need to position the rear roof track at about 2.2m to clear the workshop door: And I wonder if having the walls lower than anticipated would cause wight issues for the automated ROR design I intend to follow: If I were to position the walls as per my calcs (ground not levelled so only roughly done), based on a tripod height of about 1280mm, and a demand of at least down to 20 degrees above the horizon I could have 1800mm walls: But the eastern wall would need to flap down to 1500mm, but I could do that as part of the automated opening I think: Not worried about the wes round to north as it would need a height of 2m+ to boscure the view: That leaves me with a flat roof and 800mm of wall at the front and 600 to 800 at the sides to replicate the fall of the workshop roof, so hopefully not massively different in weight than just the flat roof in the thread. I think a 1300mm pier of 150mm diameter, reinforced with an internal steel lintel (https://www.wickes.co.uk/IG-Ltd-Internal-Lintel---1200mm/p/220067 x 2, joined to create a single central piece of steel total length of 2.2m), with the option of a couple of 2m lengths of 20mm angle iron sounds ok, but interested in any issues others can think of. Now back to emptying the swimming pool that the rain has created so I can get back to trying to dig out 200mm of compacted clay:
  4. @Magnus_e - you mentioned some usb relays in your list of parts for "Observatory Technical", anything special about these or are they just this type of thing? https://www.ebay.co.uk/itm/8-way-8-Channel-DC-12V-Relay-control-board-relays-Module-For-AVR-ARM-Development/152240067348?hash=item2372371314:g:1l8AAOSwxblbPch-
  5. Tyvek is here, enough to cover my whole workshop before I put up the featheredge on the remaining threee sides... Celotex is to be collected tonight. Now it's stopped raining I'll do my sighting @JamesF @LongJohn54 - Great minds are clearly thinking alike, either that or we both scoured the same forum and stood on the shoulders of giants, but I'm sticking with the former. I plan to keep anything mains related out of the obsy as it attaches to the workshop, and the door into it will be from in there, so now I just need to plan for a pipe to bring USB and 12v back to the workshop where I have power and cat5e gigabit connection.
  6. Any suggestions on the type of barrier? Lots of different ones like Tyvek, foil, and others like DPM, of which I have a fairly big sheet that would cover the obsy walls. It has a few nail holes in it as it was used in an emergency covering job last year when I was extending my workshop, but assuming that this is belt and braces behind the OSB, so may be ok? I think that insulating the roof is a good idea, may get some 50mm celotex, I need some for cutting sheet materials on anyway, last one was so well used with all the 8x4 sheets I have ripped in the last 6 years that it barely serves it's purpose now.
  7. One question I have is about vapour barriers and insulation - what are the pros and cons? I don't see condensation in my workshop and the obsy will have a similar construction - concrete/paving slab floor, timber frame, feather edge clad OSB walls and roof, with roof topped with Onduline. There is plenty of ventilation in the workshop, so this may be a factor, and I was assuming I would adequately ventilate the obsy so that it was at roughly the same temp as outside. Love some input on this before I put the OSB up this weekend...
  8. Good luck with the planning, it was a critical element for me, and took time to muill over the best way forward. I have had nothing but good advice and helpful comments from the members, and I'd highly recommend posting a new thread to garner opinions and encouragement for your build. I'll keep posting links to the threads that have inspired my decisions so hopefully this will assist in your planning in some small way. All the best, Ian
  9. Thanks for that James. Being so green, it's hard to know what's useful or not without input from the experienced. My thought of not showing the lower 20-30 degrees above the horizon was down to some input I got last year, and also thinking that having protection from wind would be a good thing, but I knew there had to be a good reason why I didn't see this kind of build... I'll do as you suggest and set up the tripod and mount with some timber for sighting, and build a basic framework and post some pics. Ian
  10. Hi James. My back thanks you for that in advance... Yes, if you were looking as per my first photo, it will slide off to the right, and will be at a height such that it falls back onto he existing roof behind with a decent overlap to help avoid rain or snow driven by the north wind. I think I picked up from your build (or could have been @Astrokev) that I need to deal with the possibility of water leaking in around the rails, not sure if I will have the same issue as I am using some spare Onduline I have laying around rather than EDPM, but was going to ask you about that.
  11. End of day 1, hole is now 700x700 and 450 deep, thinking I need to get down another 250, but wonder if this is sufficient still, but I'd rather it be overkill than keel over so will see how my back feels in the morning... First bit of good luck. I found two brake discs locally that fit beatifully in my 150mm tube for only £9.50 (search for "Brembo 08-4962-10" as they fit all sorts of vehicles), bit of surface rust but will come up nicely when painted: Thanks to @mhard26339 and his thread for this idea - New observatory in Norfolk An early start tomorrow preparing these and some more items like the shuttering for the hole, and if the rain clears up early I'll continue with the digging, but for now, I've Adze enough: Sorry, couldn't resist that one
  12. Absolutely Alan, she's at the heart of the rig...
  13. And we've never been seen in the same place at the same time... Have you started a build yet or just gathering info?
  14. Hi Simon, Welcome to SGL! I'm in Kent too, near Ashford, so as I'm East of the Medway, I'm a Man of Kent... Clear skies, Ian
  15. After much reading and questioning of others, and work and health interrupting things, I am starting work on my home obsy. The basic requirement is to have a remotely operable DSO imaging rig that I can learn with, due to the fact that I work away from home so much. I have an NEQ6, an Evostar 80 ED DS pro with an Atik16HR with a starlight express filter wheel, an ST80 with an atik16ic as a guide scope This led me to consider many threads, for automation noteably those by @Gonzo (Remote unmanned pico observatory) and @Magnus_e (starting summers observatory project, but also standing on the shoulders of most of the build threads. Even with all of the work others have done, I still have more questions than answers, but then it's been that way for almost 49 years... A couple of pictures to start with: A decent view from 060 to 270, but interrupted by some trees that are not in my control, but my understanding being that I need not worry too much about stuff below 030 I thought to make the walls vs. pier height obscure the lower area to sheild me from light pollution from a local large-ish town in the east-southeast. I have this 3m long 150mm drainage pipe laying around, and 2.1m of workshop wall to work with, but depending on what sage words come in about obscuring the horizon vs. having the telescope parked at a point just below the wall height will tell me how tall the peir should be, but I'm guessing it's the latter and so that would make the pier 1.7m from current ground level. I plan on this being a 2m square box, only accesible from within the workshop, with a pent roof just above the level of the current roof so I don't need to worry about further guttering, with rails allowing it to slide towards where I am standing, over the top of the existing doors. My assumption is that 2m is sufficient for any refractor that I might be able to afford, and if I can ever afford anything bigger than an Esprit 150, then I can afford to pay someone to make me a bigger obsy! I have track and wheels coming from FH Brundle, and various bits to automate the opening and closing and hope to hear back about two brake discs on sale locally for £9.50, so for now I am going to start digging a hole for the pier and gathering posts, OSB and other timber in readiness. All input is welcome, and in fact my favourite "Clerk of Works" has already been advising me to sing whilst I build: All the best, Ian
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