Thursday, August 8, 2013

What can I use to cast a mold from stone without hurting the stone?

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disciple


I'm new to this, but does anyone know what medium I would use to make a mold from a stone. In other words, There is an old building with a beautiful design sculpted in to it. I want to copy this design. I know there is a material out there that I can press against the original design and make a mold of it and then cast the design in plaster. I just don't know what material I would use to do this without hurting the stone.... Help!!!


Answer
I think the sculpey or any clay will work. If you use normal clay, any residue left will dissolve in the next rain, just don't use brown clay on light stone... if you use water based clay you would have to cast your plaster into the mold while the clay is still wet.
As the clay won't be very stable just on its own, you should consider making a mother mold on top of that. That is a hard shell, which just gives support to the soft part of your mold so it doesn't deform. It depends on the size of what you want to copy if you need it. You could make the mothermold from plaster bandages, but don't put plaster directly on the stone.
Before you start, consider carefully the shape of what you want to copy and where undercuts are and where you have to put in parting lines. What technique you use for mold making really depends on the exact shape of what you want to copy. If the structure is something complicated, you may want to practice how to make molds from more simple structures first so you are aware what causes problems and get some experience in how to solve them.

Another completely contact free method is if you happen to be at a university where they have a 3D laser scanning camera you can borrow, you could use the 3D laser scanner then make a model of your structure in the computer from the scans. That you could print out using a 3D printer. that way you can scale the model to any size (though anything large will be expensive to print)

how can i make my own animated card for christmas by internet?




sos1


i wanna make a very nice card for my fiance who is so far from me now. i wanna make him happy... can you suggest an easy way for me to do this?


Answer
Just check out anigreetings.com. Its ecards are actually 3d animated short films and your personalization goes into the animation, as opposed to traditional ecards where your message is shown separately from the context (animation or still image) of the ecard. It's great for those who are looking for serious alternatives as their ecards can be downloaded (with your message within) & played in Quicktime, Media Player & the like.

Another cool thing it has is that u can upload an image of your drawing or calligraph (i.e. in black over a bright white background) and it'll blend your drawing with your typed message nicely into the animation. In other words u can customize the animation entirely with a scan or photo of your handwriting. There're some tricks though: You must make sure the background of the image is truely bright white, as it's likely that the background isn't white enough for image captured by your scanner or digital camera even though you write on a white paper.

To do so, u must feed the image into a photo editor (I personally use the free GIMP), enhance the contrast of the image until the background becomes bright white and save it. Then upload the manipulated version. You'll probably need to preview the customization, fine tune & re-upload your image several times until you find it satisfactory. It sounds a bit complicated. But it's worth a try especially you're doing it for one of your most important persons in life. I'm sure he'll be very impressed when he sees your organic handwritten greeting message in an animation. Both you & him can save the animation & keep your hard work. Think about it.

But if this handwriting idea is too much for u. I think even the normal "typewriting" version should be enough to impress him...

Hope it helps.




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Title Post: What can I use to cast a mold from stone without hurting the stone?
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