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Silo HO Scale - Scratchbuilding. - More Practical Help - Your Model Railway Club
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 Posted: Fri Jan 11th, 2008 11:57 pm
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Wayne Williams
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Here is my first attempt to figure out how to build a Dome. It's only paper, but I cut it out all in one piece. The problem I had was the form I used to drape it over. It was 2 1/4" in diameter and I cut the paper form to fit a 2" diameter. :evil:
I had to use clear wrap to force the paper form to lay down over the form, but it gives you the idea.

Petermac, Your balsa wood idea would work, but you know what, I can be the most stubborn person when it comes to doing something that seems impossible to do. I guess I just like to be challenged. I know I can make this thing out of flat styrene sheet and I guess I won't be happy until I prove myself wrong. Besides if I do succeed in making it, won't it be Great! That's worth a 30 minute conversation piece alone when someone asks, "How in the world did you make that!"
Another thing you need to keep in mind, I don't as yet have a layout room, so all I've got it is Time.

Wayne







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 Posted: Sat Jan 12th, 2008 04:17 am
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phill
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Looks like somebodys head :D :D . No seriously that is looking good. Just thinking about this dome how about the ball of the end of a ball cock, cut in half and you have a dome and one spare to make another :D .
Phill

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 Posted: Sat Jan 12th, 2008 12:32 pm
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Petermac
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That looks pretty good to me Wayne.

In fact, that's exactly how they made the domes for the cropstores here in UK - out of segments of fibreglass bolted together rather like the segments of an orange.

I'm sure you'll make it work and I look forward to reading your thread on "how I did it"

Petermac



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 Posted: Sat Jan 12th, 2008 12:56 pm
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Wayne Williams
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That was just an attempt to verify how I was thinking. Only took about 20 minutes to layout and cut out of paper.

One thing for sure, that I have already learned, I must wait until the silo is built before making the dome. It is critical that I know Exactly what diameter the dome must fit. Another thought, I wonder just how "Round" my silo will actually be? Only time will tell.

Wayne



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 Posted: Sat Jan 12th, 2008 08:43 pm
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Wayne Williams
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Well, the drawing is done! I will be starting the actual cutting, maybe even tomorrow, if I feel ambitious enough.
By the way if anyone cares, I need to cut out the silo blocks Exactly 9/64" x 11/32", oh and I need One Thousand, Three Hundred And Seventy Six of them. :roll: :roll: :roll:

May have to come up with a way to cheat there. :shock: I actually only need 688 for the outside of the silo. I'm now thinking I should do something different for the inside. 8)8)8)

Wayne



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 Posted: Sun Jan 13th, 2008 03:07 pm
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Good luck, Wayne. :D

I look forward to seeing lots of progress when I return. :wink:

Perry



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 Posted: Mon Jan 14th, 2008 02:47 pm
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Wayne Williams
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OK, It's finally begun. All the planning and drawing is behind me and now my fingers are sticky. :evil: Fun isn't it! :roll: The material used is: .020 thick Plasticard.

The first picture shows how I had to scribe the outside of the silo center skin in order to get it to bend. I was careful to make sure that every scribe line was the same distance in from each end, so that the material would flex equally. If you look carefully you can see that I had to reduce the distance between the scribe lines to .06" from both edges in, for a span of one inch. I just could not get the materials edges to lay down without doing that. All other lines are spaced 1/8" apart.

Once all the scribe lines (one cut across the material) were in place, I wrapped it around a cylindrical object that was 1/2" in diameter smaller than what the finished silo needs to be (1.93"), and brushed solvent on the entire outside surface. This helped to soften and hold the round shape I wanted. However, it sprang back into the shape you see in these pictures.






Once the solvent had dried for about an hour, I wrapped it around another cylindrical object (caulking tube) which luckily was the exact inside diameter that I needed for the silo, and left it to set over night.

This morning I adhered the two angles to the edges, these will help stiffen the raw edges and give me bonding strength for the next step, which is adding the rectangular tube (see drawing). It's still no where near the 1.93" diameter that I need, but it is now surprisingly easy to bend and hold in place. Since I know that the next step will place a decent amount of stress on those angles I will probably let this set until this afternoon before proceeding.

The next step on bonding the rectangular tube in place will be a little tricky. Problem is, I cannot get enough solvent along the entire length for a bond without the first part evaporating. If I do one dege at a time, I cannot be sure that the rectangular tube will be at the correct angle to it's edge, to form a true circle. I need four hands working at lightening speed. :roll: :roll: :roll: Been thinking about using rubber bands to hold it all in place, then I could just feed in the solvent. That's assuming that the whole thing doesn't just go flying around in the room from the rubber bands. :oops:

Wayne






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 Posted: Mon Jan 14th, 2008 03:22 pm
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phill
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Is that the size, if it is its huge :shock: or is it due to a close up shot.
Looking good anyhow.
Phill

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 Posted: Mon Jan 14th, 2008 08:36 pm
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Wayne Williams
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It is a very close up shot, but it's still large too. From edge to edge it is about 4 inches across.

More to follow.

Wayne



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 Posted: Mon Jan 14th, 2008 09:09 pm
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Wayne Williams
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What an afternoon! :shock: :shock: :shock:

It really helps when you have a plan, but as plans go, so goes the plan. As you can see from this first picture, I had to add a shim to one edge of the 1/8" x 1/4" rectangular tube. When I bonded the angle to the edge of the silo on that side, I got it a tad bit too close to the edge, it looked fine to me, but when I tried to hold the edge next to the tube, it just would not stay where I wanted it too.:evil: :evil: :evil: So with the shim in place, I was able to form a complete circle, however now it has grown by .020 on the circumference. Not a big change, but that's why the dome will be the last thing to get built.






Now I have a completed circular tube, you can even see most of the scribe cuts I had to make to get this thing to flex.






The climbing tower is next on the list of things to do, so here it is in a slightly blurred picture. Seems the camera has trouble focusing on two different heights at the same time. :shock: If you look at the top of the silo you will see another change to the plans. I had to add a shim to the outside of the rectangular tube to space the flat stock farther away from the silo itself. If you will remember this flat stock forms the channel that the climbing tower will slide down on, to lock it to the silo.






Now comes the assembly! Well it turned out OK, albeit turned slightly to the right from the silo's shape. It's actually in a slight twist from top to bottom. A view from the bottom looks much better that this one. Trust me, you can't tell it by looking at it in real life, just too much going on in a small space to see it. I was Very pleased the way this slid down on the silo. Not even a wiggle all the way down! :shock: :shock: :shock: I must next extend the edges of the 7/16" diameter tube, that is the climbing tower, to close up the gaps on both sides. Edge to edge bonding with a 1/8" wide by .020 thick strip, sounds like fun to me! :roll: :roll:





Now for the finish to today's post. The silo with the climbing tower installed, of course all the blocks must next be cut and bonded in place, Anybody out there want to help!

Wayne






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 Posted: Mon Jan 14th, 2008 09:15 pm
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Robert
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Well Wayne I have to say I admire your work. That's an excellent beginning to what should turn out to be another great addition to the forum.



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 Posted: Mon Jan 14th, 2008 09:25 pm
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Wayne Williams
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Thanks Bob, You know it really helps when you enjoy what you are doing, and I am having fun doing this.

There were a couple of times this afternoon that I wondered why I choose a round project though! Might as well get used to it, because the thought will return when I start that Dome! :evil: :evil: :evil:

Wayne



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 Posted: Mon Jan 14th, 2008 09:52 pm
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rector
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Now that is impressive, Wayne :!: 8) Great modeling :!: :!:



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 Posted: Mon Jan 14th, 2008 10:55 pm
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Marty
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Nice job on a difficult project Wayne.
Great photos and descriptions too.
Thanks for showing us how you can do it if you give it a go...
Looking forward to seeing the project develop. Well done.



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 Posted: Mon Jan 14th, 2008 11:01 pm
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Wayne,you are working wonders mate what an intro to
scratch building, talk about in at the deep end,
S P L A S H.!! :shock: :o :lol: :lol: :lol: 8)

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 Posted: Mon Jan 14th, 2008 11:28 pm
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darrenscots
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Dwayne - the shape is looking good!! Now to the cutting of the panels!!! How about scribing of the panels instead?



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 Posted: Tue Jan 15th, 2008 01:17 am
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Wayne Williams
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Wow! Thanks for the comments Guys!

darrenscots wrote: How about scribing of the panels instead?

Good timing Darren! I have just spent way too long trying to bond the first (and only) block onto the silo. As far as I can tell It's Impossible! :evil: :shock: :roll:

I have made three of them (9/64" x 1/8") and could not get them located on the spot I wanted on the silo. Several times I couldn't even figure out witch side was up! They are way too thin (.005") to work with. The only way I could even pick them up was with tweezers, and even then, they would buckle up and fly across the table! :twisted: :twisted: :twisted:

OK, got that out of my system!

Great idea Darren, I think I will jump right on it. I have already taken a scrap piece of (.012) plasticard and scribed it. Now I need you guys to give me some good advice (you all do that, by the way). The scribe I used has a fairly sharp point, but not a cutting point. When I drag it across the styrene it is placing a depression not a cut. It looks great, but herein lies the problem, I can barely see it. Only under perfect lighting (dark outside right now) can I see the scribe lines. By the way I did try dragging an x-acto knife across the surface too. Those lines are even harder to see.

I am wondering if I try and wipe a washed down acrylic paint and immediately wipe it off, will the paint stay in the depressions?

Assuming it does, or you tell me how to make it stay, then how do I make this white styrene look like concrete and still be able to see those depressions?

At this point I am not sure how to proceed, I want this to look like the prototype. Just a thought .... can this be as simple as wiping the dark into the depressions after I have made it look like concrete?

Wayne



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 Posted: Tue Jan 15th, 2008 02:21 am
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darrenscots
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See the attached link re simulating Concrete....the tricky part is how to retain the scribed joints without losing them in the painting process...

http://www.rmweb.co.uk/forum/viewtopic.php?f=8&t=12972&hilit=culvert



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 Posted: Tue Jan 15th, 2008 02:59 am
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Marty
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... and I would do the base concrete coat first and then, once dry, a dark/er wash and wipe off to highlight the scribed grooves.
Maybe use a slightly larger scribe tool?
Have a read of Perry's painting and weathering descriptions in both his low relief warehouse and Goods Shed posts.



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 Posted: Tue Jan 15th, 2008 05:19 am
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phill
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What a great scracthbuild, very interesting, look forward to next thread. Well done.
Phill

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