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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Posted to alt.machines.cnc,rec.crafts.metalworking,comp.cad.solidworks
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digitally record an exact 3D surface? in realm of possibilities?
On Sun, 26 Mar 2006 09:49:56 -0600, "Morris Dovey" wrote:
If I wanted to duplicate the shape of my phone, I'd probably blow away $35 in 23K gold leaf to make its surface conductive and pull it up to 5V through a resistor and use that as an input to my PC parallel port. I'd ground a chucked probe needle, and I'd write a program to map however many surface points I felt I needed. If I were sufficiently anal about accuracy, it might take more than the four years you have available to accumulate enough data to adequately approximate the shape. (I'm not that anal - I'd probably just buy another phone) Such things are usually designed. This often involves creating lines, arcs, perhaps other fairly simple curves and then generating surfaces from them. Sometimes people even make 2D dimensioned prints (paper) .. which adds even more constraints as only certain simple things can be well dimensioned - hence that's all they could have made. Those surfaces may then have other related surfaces, such as 3D fillets, applied to them. Think like the designer: find & measure those original curves and then reverse engineer it to a surface or solid model with a CAD/CAM system. Pretty simple from there .... usually g. Xposted to rec.crafts.metalworking & comp.cad.solidworks .... -- Cliff |
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