plastics - rapid prototyping and 3d scanning
bobalan at sbcglobal.net
Fri Jan 23 20:58:32 CST 2009
Sridhar Ayengar wrote:
> Chuck Guzis wrote:
>>> Almost none of it is. ABS is one of the most common plastics, but
>>> you'll find others, including PVC, glass-filled nylon,
>>> polypropylene, HDPE, and more.
>> There are some filled plastics used during the 90's (probably ABS)
>> with what seems to be a too-high proportion of filler. These tend to
>> be almost fragile now, shattering into many small pieces when
>> subjected to any force at all. I've resorted to fiberglass mesh and
>> polyester resin to repair and reinforce these, finishing up with a
>> coat of paint. Doesn't look bad, but is hardly original.
>> I played with the idea of making a mold from the old pieces and using
>> acrylic resin to cast a duplicate, but there were too many details
>> (mounting bosses, ribs, tabs, etc.) on both sides to assure success.
> I have rapid-prototyping equipment here, which is capable of creating
> small parts like those. The only problem is that I currently have no
> way of scanning anything in 3D. I have to take measurements and
> manually generate a CAD drawing. It makes it less than convenient.
> Peace... Sridhar
I have always wanted to try rapid prototyping to make replacement switch
levers and possibly key caps. While searching around for RP services I found
this relatively inexpensive 3d scanner system:
It uses a camcorder and a turntable + software. Looks interesting.
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