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About Astrokev

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    Sub Dwarf

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    Bedfordshire, UK

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  1. Astrokev

    EPDM rubber roofing

    Thanks Ray. Just spent a few hours checking my design to calculate what I need and think I've finally got it sorted. Quite expensive stuff, but over the long term I'm sure this is worth it. Just want to measure the actual obsy tomorrow to make sure my drawings are correct. Paranoid - who, me ?
  2. Astrokev

    EPDM rubber roofing

    Thanks Roger - great advice.
  3. Astrokev

    EPDM rubber roofing

    Thanks Sean, that's really helpful
  4. Astrokev

    Astrokev's ROR - The Build

    Yeah, I know that's the right decision! Looking up EPDM right now.... and trying to figure out how much I need . Rubber4roofs seems a popular supplier, so will try there first. Not sure what grade to get yet....
  5. Astrokev

    EPDM rubber roofing

    Hi All Just about to order some EPDM for my obsy roof. Folks say it is easy to fit using adhesive, but does this stick effectively to wood that has been treated with a solvent based preservative? I'm keen to paint preserver on the exposed timber, but obviously won't do this if the EPDM will not stick to this! Also, please could anyone recommend what grade / thickness of EPDM I should go for? Many thanks kev
  6. Astrokev

    Astrokev's ROR - The Build

    Update of the day's progress. As hoped, I completed the bracing on the rail support posts. These could have been neater, but will do the job. I also added right-angle brackets to the warm room roof joists, to strengthen the support for the beam that forms the seal between the rolling roof and the fixed roof when the roof is closed. I was a little worried that it may be knocked out of position by the rolling roof repeatedly bashing into it if I close the roof too vigorously. Next task is either to start on the rolling roof (which I’m dead excited about), or finish the fixed roof by adding a ply sheet and then covering with EPDM rubber. Problem is I haven’t got a ply sheet, or EPDM, and I’m eager to get going on the rolling roof! Since I’m busy enjoying quality family time over the next few days, and the weather has closed in again, think I’ll source the ply and EPDM. The next task will then be dictated by whether these arrive before the rain stops
  7. Astrokev

    Astrokev's ROR - The Build

    Absolutely agree. The other thing (which I still sometimes get wrong) is to make sure you have the right layer selected when you are drawing on a layer. Nothing more frustrating than drawing a complex piece only to find it's on the wrong layer. You can move groups between layers but I always get into a pickle when doing this. Far better to get it right first time!
  8. Astrokev

    Astrokev's ROR - The Build

    Thanks for your comments - much appreciated. I'm really just riding on the back of previous great builds on the forum. Very little is purely my own design; I've cribbed and cherry-picked from lots of other builds and put them together to suit my own needs. I'm probably over-engineering my build. A perfectly good obsy can certainly be built more simply, quickly and cheaply! As I think I've mentioned before, for personal reasons, I needed a project this year that I could immerse myself in and this is the perfect thing to do just that. Regarding SketchUp, I use the free version, which is brilliant, and I guess good news for your wallet! Took me a while to get to grips with it, but once you do it really is a joy to use. If it's of interest, I've copied my obsy SketchUp file below. I've added the .pdf extension as I read somewhere that you couldn't upload .skp files to the forum. Simply copy the file to your PC, rename the file to delete the .pdf extension leaving just the original .skp extension, and it should then open without problem in SketchUp. If you do this, you'll see that each part of the build is drawn on different layers, together with additional layers that have everything dimensioned. This makes it easy to view/hide different parts of the build. The rolling roof is in green - I'm still tinkering with the roof design before I start to build it - my next job Hope this is helpful and useful Final Design mod 4.skp.pdf
  9. Astrokev

    Astrokev's ROR - The Build

    Yesterday and today were devoted to household chores - cleaning, office paperwork etc, so didn't have much time to enjoy myself. Last night I did manage to get the posts concreted in to the holes I'd dug though, which was pleasing. I creocoted the bottom of the posts to help resist decay. I'll coat the rest of the posts in solvent based preserver once all the woodwork is finished. The pointy-sticks nailed to the wooden form frame (middle pic) were to hold the post in the right place to keep it vertical. The tops of the posts were held in place with clamps. Once the concrete has hardened I'll screw the brackets in place. These pics were taken this morning once the concrete had started to go off. Next job is to add bracing to the posts and then, finally, I can move onto the rolling roof. Rain is forecast tonight so back-on went the tarp this evening, just in case In the last image you can also get a good view of my nemesis - a neighbours decorative lamp on the corner of his drive. I think he must have used a thousand watt bulb because it illuminates the whole garden like daylight .. My cunning plan is to persuade him to let me paint the near-side black. Failing that, Plan B is to make a cover that I can place over it when I'm doing my stuff. I could always plant a new bush to replace the one that has clearly died next to the lamp (presumably scorched to death by the ferocity of the light), but not sure I've got time to wait for it to grow.
  10. Astrokev

    Astrokev's ROR - The Build

    Thanks Sara, that's very kind. I've been following your obsy rebuild with great interest. I'm envious of the skies you have out there in Spain - and of course, of your excellent images! Kev
  11. Astrokev

    Astrokev's ROR - The Build

    Thanks Mick. Your dead right there - even the simplest of jobs seems to take twice as long as I expected! I'm keeping a log of all the materials and costs, but am beginning to wish I hadn't started this as the cost is really escalating! Good job it's taken me nearly a year so far since I started, which spreads the cost somewhat. I'm starting to think about power supply to the obsy. In the little research I've done so far, it appears there are no hard and fast regs relating to whether outside SWA cable needs to be buried. I gather it can be routed along fencing. Does anyone know for sure the regs regarding this? Thanks
  12. Astrokev

    Astrokev's ROR - The Build

    Managed to spend a bit more time on the obsy today. Bits completed today - Attached the rails that will support the steel V-track. These are 120x45mm timber, chosen to protrude at the sides, which will allow me to curve the sides of the roof underneath to help prevent it lifting in high winds. I think this is unlikely, but it also serves to reduce wind blown debris getting into the obsy when it's shut, and helping to keep bugs out. The rails extend beyond the right end of the obsy next to the warm room to allow the roof to roll clear of the scope room. All standard design stuff here, cribbed from numerous other builds (but mainly YesYes' excellent build). Also dug the holes for the posts that will support the free ends of the rails (no pics of these). I'm hoping to fit these tomorrow, then I can get started on the exciting bit of building the rolling roof :-) Collection of pics below from various angles to show the basic design for anyone unfamiliar with this approach. Also posting a general view of the obsy before I added the rails, as I haven't posted one yet that shows the membrane (upper layer still to add).
  13. Astrokev

    Astrokev's ROR - The Build

    The rails to support the rolling roof are ready to attach. Before I do this, I decided to clear the ground around the observatory to make space to erect the posts to support the rails where they extend beyond the right side of the obsy. The ground where I need to erect the posts has been a dumping ground for the spoil from digging the hole for the pier base, and all the other debris from the build so far. Much as though I want to press on with the main build, this had to go to make room! Sadly this involved the purchase of a small skip, so more cost - this is getting expensive! Still, I'm pleased with how tidy the area around the obsy now looks. I levelled the ground all the way round the building. Eventually I'll put stone chippings around the obsy. Before and after pics below. Tomorrows job is putting up the roof rails - yay!
  14. Astrokev

    How many wheels for a rolling roof?

    Yeah, I think using bolts will allow me to adjust the alignment from the top, whereas using screws would mean I couldn't adjust and tighten these with the wheels and rails in-situ on the track. Sensible suggestion about the plate / washer! Thanks Roger
  15. Astrokev

    How many wheels for a rolling roof?

    Thanks Roger, a valid point. The main consideration behind my original question was not cost but how easy it will be to align 3 wheels on a side (and I guess the extra effort of installing 2 extra wheels). Since I'm using V groove wheels and track, the alignment will have to be pretty good to ensure there is no binding of one of the wheels, or a tendancy for one to 'ride up' the track. I only have simple hand tools so I'll have to be accurate with the drilling of the wheel mounting holes. For the wheels I've chosen, the wheel housing will be mounted underneath the wooden structure and will bear the roof weight vertically (see pic). I may try and create slight slots rather than circular holes (at 90' to the rails) to give a small amount of lateral adjustment, at least for one of the wheels. This will hopefully do the trick. Actually, thinking some more on this, maybe I could leave the centre wheel mounting bolts slightly loose, to allow the wheel housing to 'auto-align'. Also, since we build these things out of wood, there's likely to be some warping and movement of the structure over time. This approach would also help allow for this.

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