Weird and Wacky Engineering
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Max the Magnificent
The funny thing was when I needed some pics of old computers/connectors for a ...
maryl
I was going to make this same suggestion. I have seen the foam used for ...
I have a rocky problem…
Clive Maxfield
11/23/2011 10:07 AM EST
I’m caught between a rock and a hard place as it were, because I want to create a miniature model, but I don’t know how to achieve the rocky surface/texture I’m looking for…
I will explain more momentarily, but first… do you recall my I am wearing my sad face blog from a few weeks ago. In that column I mentioned how I had come across an old television (circa 1950s) and my plans for using it as the basis for my latest hobby project.
Now, generally speaking, I try not to do anything nasty to old pieces of electronic equipment, but the television repair guy from whom I purchased this unit assured me that it was “dead in the water” and there was no reasonable chance of ever getting it to work again, so I didn’t feel too bad about removing what was left of the electronics, including the main cathode ray tube. (I took all of this this stuff down to my local technology recycling center for safe disposal, with the exception of the vacuum tubes, which I’ve kept for “show and tell” when I give an occasional talk to students.)
The cabinet itself looks really nice overall, but it does have some dings and scrapes and worn places, so at some stage I’m going to have to refinish it. Someone recommended an old book called The Complete Book of Furniture Repair and Refinishing by Ralph Parsons Kinney and I managed to pick up a second-hand copy from Amazon. Actually, by some strange quirk of fate, while I was visiting my local Home Depot store recently I saw that they have a free Cabinet Refinishing tutorial in the paint department every Saturday at 1:00pm, so that’s where I will be this coming weekend.
At first I couldn’t work out how to remove the glass from the front so I can clean it and also reach inside to work on my model. I knew that there had to be a way, because I’m sure that screens were occasionally damaged and it would be silly to expect the repair man to disassemble everything just to replace the protective glass panel. And then, when I was moving the cabinet around the garage, I grasped the strip of wood at the top of the screen and felt a screw hidden under the overhang. There are three such screws and I am sure that if I remove them I’ll be able to easily lift the glass out to allow me to play around.
The starting point for the miniature model I wish to create was a caveman scene I ran across on Google Images as shown below. The side of the cave closest to us will be the TV screen, so the “entrance” to the cave will be located toward the back of the set.
Of course I’m not going to replicate this particular scene, but I do like the general idea. I’m thinking of having a wood fire in the middle of my cave with folks sitting around it (I can use flickering LEDs to give a fire effect).
Note the mountains and sky and so forth that you can see through the entrance to the cave. In my case, I’m planning on having a flat-screen LCD mounted on the back of the TV set. I can use a cheap-and-cheerful notepad computer (that I can pick up from the technology recycling store) to drive this. This will allow me to display a variety of different scenes as required. I might even use a 3D package to render grandiose scenes (or, more realistically, ask one of my graphics artist friends to do it for me [grin]).
In fact, we could tie this to the time of day so that daytime and nighttime in the real world are mirrored in the model. We could have clouds gradually moving across the sky in the day; and then a huge moon and shooting stars and fantastic images of the Milky Way visible at night. We could also present really amazing lightning displays in the model when it’s storming outside my house in the real world. Maybe we could go one further and map events seen through the entrance to the cave in the model onto the four seasons in the real world (snow in the winter, and so on and so forth).
I’m also thinking of having a waterfall on one side looking a bit like the one in the image below. This wouldn’t have real water of course – it would just look like water.
I’ve been meandering around the Internet looking at different images of caves, just to gather some thoughts about different structures and the shaping of the walls and textures and colors and suchlike (a couple more examples are shown below).

My current problem is that I’m wondering how to obtain a realistic-looking rock texture for my model. As a first pass, I’m planning on creating a framework out of chicken wire, overlaying this with paper mache, and painting it to look like rock, but I’ve been told that this won’t look as good as I’m hoping. I’ll still try, of course, but I’m also starting to search for alternative solutions. I did look on Amazon for books on creating dioramas and landscapes for railway models, but every one I’ve found has mixed reviews – some folks say “this is great” while others say “this is rubbish” or “you can’t get these materials anymore” or “the author is a complete and utter idiot,” none of which is tremendously encouraging. So, as always, any ideas you have would be very gratefully received…
If you found this article to be amusing and/or of interest, visit Programmable Logic Designline where – in addition to my blogs on all sorts of "stuff" (also check out my Max's Cool Beans blog) – you will find the latest and greatest design, technology, product, and news articles with regard to programmable logic devices of every flavor and size (FPGAs, CPLDs, CSSPs, PSoCs...).
Also, you can obtain a highlights update delivered directly to your inbox by signing up for my weekly newsletter – just Click Here to request this newsletter using the Manage Newsletters tab (if you aren't already a member you'll be asked to register, but it's free and painless so don't let that stop you [grin]).
I will explain more momentarily, but first… do you recall my I am wearing my sad face blog from a few weeks ago. In that column I mentioned how I had come across an old television (circa 1950s) and my plans for using it as the basis for my latest hobby project.
Now, generally speaking, I try not to do anything nasty to old pieces of electronic equipment, but the television repair guy from whom I purchased this unit assured me that it was “dead in the water” and there was no reasonable chance of ever getting it to work again, so I didn’t feel too bad about removing what was left of the electronics, including the main cathode ray tube. (I took all of this this stuff down to my local technology recycling center for safe disposal, with the exception of the vacuum tubes, which I’ve kept for “show and tell” when I give an occasional talk to students.)
The cabinet itself looks really nice overall, but it does have some dings and scrapes and worn places, so at some stage I’m going to have to refinish it. Someone recommended an old book called The Complete Book of Furniture Repair and Refinishing by Ralph Parsons Kinney and I managed to pick up a second-hand copy from Amazon. Actually, by some strange quirk of fate, while I was visiting my local Home Depot store recently I saw that they have a free Cabinet Refinishing tutorial in the paint department every Saturday at 1:00pm, so that’s where I will be this coming weekend.
My TV cabinet with the electronics removed
At first I couldn’t work out how to remove the glass from the front so I can clean it and also reach inside to work on my model. I knew that there had to be a way, because I’m sure that screens were occasionally damaged and it would be silly to expect the repair man to disassemble everything just to replace the protective glass panel. And then, when I was moving the cabinet around the garage, I grasped the strip of wood at the top of the screen and felt a screw hidden under the overhang. There are three such screws and I am sure that if I remove them I’ll be able to easily lift the glass out to allow me to play around.
The starting point for the miniature model I wish to create was a caveman scene I ran across on Google Images as shown below. The side of the cave closest to us will be the TV screen, so the “entrance” to the cave will be located toward the back of the set.
Of course I’m not going to replicate this particular scene, but I do like the general idea. I’m thinking of having a wood fire in the middle of my cave with folks sitting around it (I can use flickering LEDs to give a fire effect).
Note the mountains and sky and so forth that you can see through the entrance to the cave. In my case, I’m planning on having a flat-screen LCD mounted on the back of the TV set. I can use a cheap-and-cheerful notepad computer (that I can pick up from the technology recycling store) to drive this. This will allow me to display a variety of different scenes as required. I might even use a 3D package to render grandiose scenes (or, more realistically, ask one of my graphics artist friends to do it for me [grin]).
In fact, we could tie this to the time of day so that daytime and nighttime in the real world are mirrored in the model. We could have clouds gradually moving across the sky in the day; and then a huge moon and shooting stars and fantastic images of the Milky Way visible at night. We could also present really amazing lightning displays in the model when it’s storming outside my house in the real world. Maybe we could go one further and map events seen through the entrance to the cave in the model onto the four seasons in the real world (snow in the winter, and so on and so forth).
I’m also thinking of having a waterfall on one side looking a bit like the one in the image below. This wouldn’t have real water of course – it would just look like water.
I’ve been meandering around the Internet looking at different images of caves, just to gather some thoughts about different structures and the shaping of the walls and textures and colors and suchlike (a couple more examples are shown below).

My current problem is that I’m wondering how to obtain a realistic-looking rock texture for my model. As a first pass, I’m planning on creating a framework out of chicken wire, overlaying this with paper mache, and painting it to look like rock, but I’ve been told that this won’t look as good as I’m hoping. I’ll still try, of course, but I’m also starting to search for alternative solutions. I did look on Amazon for books on creating dioramas and landscapes for railway models, but every one I’ve found has mixed reviews – some folks say “this is great” while others say “this is rubbish” or “you can’t get these materials anymore” or “the author is a complete and utter idiot,” none of which is tremendously encouraging. So, as always, any ideas you have would be very gratefully received…
If you found this article to be amusing and/or of interest, visit Programmable Logic Designline where – in addition to my blogs on all sorts of "stuff" (also check out my Max's Cool Beans blog) – you will find the latest and greatest design, technology, product, and news articles with regard to programmable logic devices of every flavor and size (FPGAs, CPLDs, CSSPs, PSoCs...).
Also, you can obtain a highlights update delivered directly to your inbox by signing up for my weekly newsletter – just Click Here to request this newsletter using the Manage Newsletters tab (if you aren't already a member you'll be asked to register, but it's free and painless so don't let that stop you [grin]).
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Max the Magnificent
11/23/2011 10:28 AM EST
I'm also still wondering how to create my caveman figures -- starting with what scale to use. I was initially thinking of having them 6 inches tall -- but that will make the rest of the cave relatively small -- now I'm thinking of maybe 1/2" to a foot...
...the next problem is where to get them ... does anyone supply miniature cavemen figurines -- or do I just get regular little figures and put long hair etc on them -- or do I create them from scratch?
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Battar
12/4/2011 5:53 AM EST
Use the stuff measigned for dry-wall repair - or something called spackle - to create rock. Then paint with acrylics. It's the painting that creates the realistic look, not the material. If you can't find cave-men figures, see if any model shop stocks trade-union leader figures. Same thing, sort of.
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Max the Magnificent
12/5/2011 9:22 AM EST
The thing I'm worried about spackle is that when it dries out it may start to crack and bits may fall off -- maybe this won't be a problem once it's painted with acrylic...
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zeeglen
11/23/2011 11:45 AM EST
The modeling bug has bitten again!
G scale (1:22.5) would be the easiest to find figurines as large as they come for railroad modeling. A 6 foot tall man is 3.2 inches in G scale, for larger you may have to rework Barbie and Ken dolls. For smaller there are many other scales to choose from that will give a 6 foot tall man down to 0.33 inch tall.
I doubt you will find ready-made cavemen figures - trains did not exist in prehistoric times. But something that might work is modular figures, for example G scale "Adam and Eve" nude kits where you assemble various parts of the anatomy to get the poses you want. See
http://www.walthers.com/exec/productinfo/590-45900
http://www.walthers.com/exec/productinfo/590-45901
A bit of paint for clothing and you could have a convincing caveperson. Smaller scales for the kids.
Flickering red, orange, yellow, green, and blue leds do make a convincing campfire, use a translucent medium such as white hot glue or maybe cellophane for light diffusion.
As for rocks there are many ways - windowscreen and plaster (difficult), hardshell which is paper squares soaked in hydrocal (a type of plaster) and laid on a framework of masking tape and crumpled up newspaper, dense styrofoam either painted directly or with a thin plaster coating and carved, rock molds either homemade or purchased, and probably several more ways.
Visit a good model railroad supply shop to see what is available. Do some experiments first to see which works best for you before tackling the actual diorama, or build various version on a base than can be slipped in and out of the TV cabinet.
Above all, have fun!
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zeeglen
11/27/2011 12:38 AM EST
Further to those campfire leds, use triangular oscillators 0.5 to 2 Hz to simulate wind blowing through the embers, and use separate oscillators at a slightly different frequency for each colour. Filter the power supply sufficiently that the oscillators do not injection lock to each other. You want each colour to flicker independent of the others so the combined colour combination is completely random.
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Max the Magnificent
11/28/2011 12:23 PM EST
Sounds good to me...
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rbelli1
12/4/2011 12:40 PM EST
Or you could use an Arduino like the rest of the world!
Put an anemometer on the roof and it could respond to the wind outside.
BoB
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Max the Magnificent
12/5/2011 9:10 AM EST
I must admit that I've been thinking about starting to play with an Arduino...
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Max the Magnificent
11/28/2011 12:23 PM EST
Using small dolls and adding more hair and dirt and stuff might be the way to go -- I think the G scale sounds like a good size -- I may make the cave first and then experiment with paper figures to get the best size...
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Robotics Developer
11/26/2011 10:30 PM EST
I once saw a railroad layout that used real sand (various sizes/colors) sprinkled onto the model bases that were covered with a thin layer of glue. It looked quite nice, but I would practice a bit before committing to the full model (or maybe do removable sections - to avoid losing a large model with one oops). The effect of the real thing can be quite, well real....
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Max the Magnificent
11/28/2011 12:17 PM EST
I thought about using sand, but then I thought that this might look a bit artificial -- when I make my paper mache "shell" I will also make a number of smaller sections and then play with these adding different textures -- like the sand...
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zeeglen
11/27/2011 12:59 AM EST
I think what needs to be considered here is that Max is undertaking a recognized art form - miniature 3D sculpture. The final effect is fascinating to viewers, and the more detailed the more intruiging. Go for it, repeat as required, gain artistic skill, and have fun.
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Max the Magnificent
11/28/2011 12:24 PM EST
"...and have fun..."
Always :-)
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sharps_eng
11/27/2011 6:23 PM EST
The fantasy/gaming hobbyists are a good resource for this stuff. We have WarHammer stores all over the UK. Possibly an Orc might be persuaded to look Neanderthal. The books have very good tutorials on acrylic painting for effects like rocks and other natural surfaces. My kids both did this stuff and became very good at what you describe; much fantasy modelling is non-manmade objects which sets different challenges than railroads and airplanes.
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Max the Magnificent
11/28/2011 10:34 AM EST
I'll be in Sheffield UK in the middle of December because my mom is having an operation -- I see there are a couple of stores WarHammer in Sheffield -- I'll try to find the time to drop in and look at the books -- thanks for the suggestion
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ReneCardenas
11/30/2011 5:49 PM EST
Max,
If you are going to show ligthing effects, encounter by prehistoric times, a good set of flashers circuits and white LEDs can help set the mood for lighting.
Early humans may have seen nature in many different ways. ;-)
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lcovey
12/1/2011 11:46 PM EST
I've had some pretty good luck with insulation foam to create rock structures. You can carve it into the shapes you need, or, if you are quick and know what you want to do with it, you can mold it before it sets. You might also be able to use chicken wire to establish the basic shape and spray the foam over it in layers.
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Max the Magnificent
12/2/2011 9:41 AM EST
Actually that is a really good idea -- I love that program "The Homes Inspection" on The Homes and Garden TV channel featuring building contractor Mike Homes fixing problems with houses -- they always use spray foam and it does have a nice "organic" look to it...
... I will add this it the list of things to experiment with...
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maryl
12/15/2011 7:31 PM EST
I was going to make this same suggestion. I have seen the foam used for dioramas that the kids need to make for school and it is (or can be) fairly realistic.
BTW, “technology recycling store”? At my house this is called a “garage”. I am surprised that with your various interests you don’t have the same thing. ;-)
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Max the Magnificent
12/16/2011 9:30 AM EST
The funny thing was when I needed some pics of old computers/connectors for a webinar I was writing -- and I had to go down there to buy the same sort of equipment that I'd given them a couple of years before :-)
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WKetel
12/2/2011 9:51 PM EST
Research "Fraggle Rock", an older TV show set primarily in caves, for some ideas. Another option could be to use actual stone, depending on the scale and your patience and skill. Or, as a last resort, consider "plastic". At one Disney park it became clear that the entire exhibit, except for the dirt, was made of plastic. This included rocks,trees, logs, a riverbed, some fossil bones, and a portion of an old house. Different textures, partly worn away, and different colors. That was all it took.
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Max the Magnificent
12/5/2011 10:11 AM EST
I used to love Fraggle Rock -- about a year ago I got the first season on DVD -- great for young kids...
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