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Silo HO Scale - Scratchbuilding. - More Practical Help - Your Model Railway Club
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 Posted: Fri Jan 18th, 2008 08:06 pm
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Wayne Williams
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Thank You One And All. All those comments I think is what keeps me going. :roll: :roll: :roll: Yea, OK, I'm liking it too! :shock:

I (think) I have a way to build the dome. It may turn out totally a wasted effort, but, if it works, we will all enjoy it. (Don't ask yet). :evil: :D

The structure sub assembly has started. The foundation is there only to keep the wall from curling in while the glue sets.



I told you I would have a picture of the concrete block, here it is. The walls are now bonded to the foundation. I had trouble holding it in the right place to glue it. Ended up having to place pieces on the inside to hold the walls up where they belong. This had an added benefit in that it reinforced the flat walls also. The walls only overlap the foundation by .030, the thickness of the floor!



I have added the entrance door trim and threshold. All I had for the trim was a 2mm angle extrusion, which was too big, so I had to cut it down to 1mm on each leg of the angle.

I had tried mitre cutting before (on the facia of the Outhouse) and while I think it looks better that offset butting the pieces, I need to work on a way to control that 45 degree angle. :evil: :evil:



The next item of interest will be the structures roof. This will not be nearly as simple as the notch in the foundation for the silo was. All I had to do there was set the silo on the floor centered where it belonged and trace the outline. I cannot do that on the sloped roof! :roll: :roll: :roll:

Wayne



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 Posted: Fri Jan 18th, 2008 08:17 pm
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rector
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Wayne Williams wrote:I (think) I have a way to build the dome. It may turn out totally a wasted effort, but, if it works, we will all enjoy it. (Don't ask yet). :evil: :DNothing like suspense to keep a thread running :lol: :lol: :lol:



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 Posted: Fri Jan 18th, 2008 08:27 pm
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Wayne Williams
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I know [size=9](Perry taught me). :shock:

Wayne :lol: :lol: :lol:



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 Posted: Sat Jan 19th, 2008 02:38 am
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Wayne, the blockwork basecourse looks good. What have you got planned for the door & window?



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 Posted: Sat Jan 19th, 2008 12:39 pm
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Wayne Williams
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darrenscots wrote:Wayne, the blockwork basecourse looks good. What have you got planned for the door & window?

Now that's a good question, since I have never done a window before, and I do not have a program on my computer to produce it, I will just have to fake it. :shock: Really, I am still thinking about the windows, as far as the door is concerned, I have done something that I am not sure I will keep in place. Not to proud of it at this moment. I will post a picture of what I have done shortly.

Wayne



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 Posted: Sat Jan 19th, 2008 12:57 pm
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Wayne Williams
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This is the structure with the walls and foundation in place. As I stated in my previous post, I am not real happy with the window in the door. There is no "Glass" in the opening of any kind.



Roof panels are shown below, they took several hours of constant pattern work to develop. Right now they look acceptable to me, but that is only holding them in place, which is not easy to do on that slope. I will not bond them in place for quite a while yet, as I need to be finished with the windows and door before that can happen.



I think I got ahead of myself here. The walls were wanting to taper in towards each other, and in my haste to prevent that, the next thing I knew I had bonded in the trusses.:roll: :roll: So now I'm hoping they do not get in the way of working on the windows.



The next step will be putting in a floor to the silo. In reviewing the prototype pictures I noticed that the silo sets on a curved chunk of concrete that protrudes out beyond the perimeter of the silo. I do not have real good pictures of this area, so I may have to request them from my grandson.

One other thing, the kids have installed a hammock inside the silo. It is mounted thru the walls of the silo with large bolts. Anyone got any ideas on how to model a hammock in HO scale?

Wayne



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 Posted: Sat Jan 19th, 2008 02:27 pm
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For a hammock I would have though needle and thread with paper or very thin material, either plain or coloured.



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 Posted: Sat Jan 19th, 2008 03:36 pm
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Wayne, if it helps I have uploaded the window type below for you - these can be printed from trial versions of home plan software packages available on the internet (there are usually lots of different types of doors & windows). I printed my windows to card and then cut them out & pasted acetate to the rear however i have subsequently seen a method of printing the window frames to sticky labels and then sticking these to the acetate.



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 Posted: Sat Jan 19th, 2008 06:18 pm
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Wayne Williams
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Thanks Darren! I will give it a try! I have been All Day working on the Dome!!!!! Just after a trip to "Dunkin Donuts" for my wake up coffee this morning, I had an idea on how to build the dome, which seemed much easier than my original idea. Got so excited (every done that?) that I just had to get started. So the windows have waited for now, but they will return. :evil:

Wayne



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 Posted: Mon Jan 21st, 2008 04:03 pm
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Wayne,

Having been away from the forum for a while I have to say how sorry I am to have missed the day-by-day development of this project.

Having only ever scratchbuilt a little outhouse before, this is indeed an ambitious undertaking; one which I, and I'm sure many more scratchbuilders, would hesitate to tackle. Most scratchbuilt buildings are boxes upon boxes and are relatively simple constructions. Your silo seems to combine examples of pretty much every geometric shape known to mankind! You have made fantastic progress in a short space of time, and perhaps even more importantly, I can see that you are enjoying solving the problems that crop up along the way.

A huge 'WELL DONE' from one who knows and appreciates the work involved.

No doubt you have already found your modelling skills have improved from your previous project but I can say from previous experience that there is no substitute for getting in there and getting something built. Your silo is inspirational for all those teetering on the brink of having a first dabble in scratchbuilding.

I shall continue to watch this project through to completion with great interest. Keep up the good work. :wink:

Perry



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 Posted: Mon Jan 21st, 2008 10:12 pm
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Wayne Williams
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Thank You Perry, that means a lot coming from you! I have really enjoyed making this thing. I am having small problems with the Dome as you will soon see, but even with that, I am still happy with what I have accomplished.

Nice to have you back Perry!

Wayne :D



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 Posted: Mon Jan 21st, 2008 11:10 pm
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Wayne Williams
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The beginning of the Dome!

Every project has it's difficult parts, and every difficult part has a beginning, and here is mine!

I began with a plan to build the dome by using heat to bend the styrene pie shaped pieces. The more I thought about this the less I liked it. Primarily because of getting the bent shape to be very accurate for 24 pieces. So after many hours of thought, I came up with this idea.

I began by cutting out a flat disk .020 larger in diameter that the exterior of the silo. Now I have discussed previously about the silo maybe not being exactly round. Well it turned out to be really close, but as predicted not exact, so I first cut out a flat disk the slightly larger than the inside diameter of the silo, then sanded down very slowly by hand to get as close of a fit as possible. I then dropped in into the bottom of the silo (silo was upside down) and tapped it into place with a pencil. This removed the little flat spots that were in the diameter. This disk is still removable and will be for awhile, but eventually will become part of the dome.

Now back to that .020 larger diameter disk, (shown in picture). I made this drawing and cut out the paper in order to set in the disk, using the marks on the paper I began bonding in the ribs for the dome. Five are shown here, 24 are needed.
I have scribed in the center a 7/16" diameter hole for a 7/16' diameter styrene tube. Well, I learned a lesson here, when you want a hole to be a certain size you must make it smaller than what you want, thus allowing you to sand the hole out larger for a good fit. The actual hole ended up being 1/2', so I had to wrap a flat strip around the base of the 7/16" tube to get a tight fit. That in turn meant I had to mitre the inside corner of every rib for clearance. I believe that's called the snowball effect.:shock:




Research told me that most farming silo dome's have six segments per quarter or 24 total, that meant each segment was 15 degrees wide. 15 degrees times 24 segments equals 360 degrees.

One quarter of the ribs are in place here. I had to skip every other rib because my fingers are too big. :shock:
If you will notice that each rib is taller than the top of the tube, that's because I needed to have each rib level with the tube, and the only way was to make them all taller and I will touch sand them down level later.


All the ribs are now in place. The final 12 ribs had to be put in with a pair of tweezers. As you can see I didn't quite place the ribs on their respective lines. The problem was I couldn't see the line with my hands in the way. :shock: This will only create havoc in work sessions yet to come.



And here it is from a side view.



Now for a test fit to the silo. I needed a good nights sleep at this point.



And you Thought I have showed you the difficult parts! :evil: :evil: :evil:

Wayne



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 Posted: Tue Jan 22nd, 2008 03:18 am
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What a scratchbuild, excellent mate, genius. Think it is looking great. Keep it coming.
Phill

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 Posted: Tue Jan 22nd, 2008 03:44 am
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OMG :shock: :shock: :shock:

That beastie will survive a twister :shock:

Looking good Houston. [size=9](ooh, sorry, Hudson)

Keep it coming.



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 Posted: Tue Jan 22nd, 2008 07:47 am
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Wayne - that's really ingenious !!!

It looks brilliant but I'll bet your brain is a bit scrambled after all those maths and intricate cutting/fixing but a really clever way to get around a difficult project. As Marty says, it'll be as strong as the real thing - are you going to make the fodder to go inside ? :lol: :lol: :lol:

Looking forward to the "topping out" ceremony !!

Petermac



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 Posted: Tue Jan 22nd, 2008 08:12 am
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Perry
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I'm utterly speechless, Wayne.

You have gone from being a complete beginner to an extremely accomplished scratchbuilder in one leap.

Your planning and execution has been outstanding.

By the way, I chuckled at your comment about the 'snowball effect'. I didn't think it would be long before you discovered it. :shock: I have called it seriously less polite things in the past though! :roll: :lol: :lol: It can sometimes be minimised by remaking the 'offending' part, meaning that only one part has to be duplicated. It can then help avoid several other parts needing to be modified or made more complex.

Perry



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 Posted: Tue Jan 22nd, 2008 08:19 am
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As we say in modern jazz parlance, this really is "something else"! (I'll never look at a Jaffa Orange in the same way again!!!).
Ken.



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 Posted: Tue Jan 22nd, 2008 10:25 am
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Ken wrote:....................................... (I'll never look at a Jaffa Orange in the same way again!!!).
Ken.


:lol: :lol: :lol: :lol: :lol: :lol:

Petermac



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 Posted: Tue Jan 22nd, 2008 10:51 am
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Wayne

This is excellent stuff, I am really enjoying watching how you problem solve, which is part of the fun of scratchbuilding. I assume all that hard work in building the dome will be invisible, as I expect some sort of outer skin will cover the ribs? If I am right, I am looking forward to seeing how you solve this one, presumably lots of petal shaped pieces :?:

From your original photos you cannot see the dome. Does this mean that you scaled the silo with your tape measure :shock: , how did you work out the final shape :?:

Bob(K)

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 Posted: Tue Jan 22nd, 2008 12:38 pm
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Wayne Williams
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Novice wrote:From your original photos you cannot see the dome. Does this mean that you scaled the silo with your tape measure :shock: , how did you work out the final shape :?:

Bob, that structure attached to the silo, used to be just a storage shed. Last summer my grandson decided to make it his bedroom for when he returns from college during the summer. So, I went inside and helped him, wire, drywall, paint, put in a bathroom, door , windows, you name it. During that process we also poured concrete in the floor of the silo and the structure. With all that work I knew what the diameter of the silo actually was, and by measuring the height of one of those blocks in the silo and counting them vertically, it worked out to 40 foot tall. The dome is just a true half circle of that diameter.

Yes, I will cover the ribs with a thin skin. I am using .005 thick styrene. I didn't want a thick overlap to show, so that's why it's so thin. It does pose problems though. I have to be real careful with the solvent, so that it doesn't eat right through it. :shock:

Thanks for all the nice comments Everyone! They keep me motivated! :D :D :D

Wayne



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