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

3d scanner laser image

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)

Think about how mobile our computing devices have become and the convergence of different devices?

Michael

such as cameras, phones, computers, etc. What do you think the computer of the future will be like? What capabilities will it have that computers currently donât have? Do you see desktop computers becoming obsolete in
I mean becoming obsolete in the near future?

Answer
Well, D-Wave's quantum computer is worth watching.

Personally, I don't see desktop computers becoming obsolete especially soon.

I mean, I'm typing this on a mechanical keyboard and I'm looking at a display on my desk. That's the same as I used in about 1972, except back then it was a Tektronics storage display connected to a CDC mainframe. It's a setup I'm comfortable with. I've used smartphones, and I've used projection walls but for editing documents this is better. Of course, that's just the human interface - whether the computer is a mainframe, cloud, under the desk or built into the keyboard is of less concern.

I can see voice recognition finally making the leap to actually working for everyone, regardless of background noise and your accent.

For hardware, if 3D printers take off, I can see 3D laser or ultrasound scanners becoming more common, and some medical diagnostics becoming more mainstream (again, perhaps ultrasound or MRI based)

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