Re: [CAD_CAM_EDM_DRO] RotoCasting - a simple way to make Bellows and other hollow parts

BTW....we use Spray silicone t school for all our mold making (RTV molds).
It works very well for us...most of the time.

However, some surfaces...such as stones...need to be sprayed with a coat or
two of shellac prior to using the spray silicone. Also, a light coat of wax
sometimes helps as well.

Smoke
-----Original Message-----
From: Paolo Velcich <pavel@...>
To: CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO@yahoogroups.com>
Date: Wednesday, May 02, 2001 11:00 PM
Subject: [CAD_CAM_EDM_DRO] RotoCasting - a simple way to make Bellows and
other hollow parts

>I prepared a simple tutorial about the roto-casting process which could be
>helpful in making bellows with a choice of several materials.
>The URL is: http://www.korumdesign.com/rotomolding/rotocast.html
>The pictures are quick roughs but should be clear enough to understand the
>process.
>I will check for some other links available, I think you should find some
>other informations starting from www.smooth-on.com or from
>www.computersculpture.com
>I'm in the process of making the mold for my own bellows, still in the
>design process, but I can tell you that they will be around 325mm (W) x
>650mm (L) x 100mm (H).
>650mm is the extended range.
>
>Paolo Velcich
>industrial designer
>pavel@...
>
>
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