At 13:35 30-08-99 Pedro Garayo wrote:
>Dear list,
>Some things have changed. The final bottles will be made of glass. I
>need the prototypes to be transparent, and they don't need to be hollow,
>or painted... Maybe in this case the best is CNC machining of PMMA or
>something like that. Any idea? Best regards,
>
Dear Pedro,
Continuing my earlier small CNC lecture (so again be warned
for a possible commercial bias):
CNC machining in perspex is OK.
To create a fully transparent model, we do advise NOT attach two separate
parts as this would leave visible marks, but instead to machine each
bottle model from two sides. You have to turn around your model after
machining the first side, fix the block again, and find back your zero
position. Our DeskProto manual clearly explains how to do so, using
the example of a human statue. See the resulting perspex model (called
'Torso') on the Gallery of our Web site. I will send you a picture of
a CNC milled perfect model of a perfume bottle as well.
The machined model can then either be hand polished (start sanding, using
a more and more fine type of paper, and end using car-polish), or be
'flame-polished' where you use a flame to melt just the upper layer of
perspex,
resulting in a glass-like, fully transparant surface. Do note that flame
polishing
requires some skill, perhaps you can find a modelmaker capable of doing
it for your.
Wishing you succes,
Best regards,
Lex Lennings.
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Delft Spline Systems, The Netherlands.
We offer DeskProto: affordable Rapid Prototyping using CNC milling.
mailto:info@spline.nl --- website: http://www.deskproto.com
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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