From: Greg Pettengill (gpetteng@bellsouth.net)
Date: Wed Mar 12 2003 - 19:58:39 EET
Bob,
For a long time I have wanted to do Roto Casting but have not been able to
get it together. :-( I did a quick search on the Web and found Machine
Designs, Inc. and they make Roto Casting machines!
http://www.plastermaster.com/rotation/machinedesigns/Catalog.asp
I would be very eager to work with you and your clients in establishing and
developing Roto Casting capabilities.
============================================================================
Don,
The smallest machine on the Web Page above should be large enough to do your
piece. Perhaps we can ask them to do it as a demo?
Best Regards
Greg Pettengill
Cote' Art & Engineering
321-269-7587
============================================================================
----- Original Message -----
From: "Bob Olsen" <Bob@protogenic.com>
To: "'Greg Pettengill'" <gpetteng@bellsouth.net>
Sent: Wednesday, March 12, 2003 10:19 AM
Subject: RE: clear aorta model
> Greg, funny you mentioned RTV materials and rotational casting. We have
had
> two inquiries recently. Do you know anyone that does this, or can you
point
> me to any web sites?
>
> Thanks! Bob
>
> > -----Original Message-----
> > From: Greg Pettengill [mailto:gpetteng@bellsouth.net]
> > Sent: Wednesday, March 12, 2003 12:04 AM
> > To: Don_smith@mail1.myexcel.com; rp-ml@rapid.lpt.fi
> > Subject: Re: clear aorta model
> >
> >
> > Don,
> >
> > I will be a very interested in what you end up doing on this,
> > so please let me know...
> >
> > If you want a thin walled part with a consistent wall
> > thickness then I would suggest that you consider using Rotary
> > Casting. This is commonly used to make flexible parts in
> > thermoplastics but can also be used with RTV materials.
> > Besides being relatively inexpensive it will also enable you
> > to avoid all the issues and difficulties of a core.
> >
> > Best Regards
> > Greg Pettengill
> > Cote' Art & Engineering
> > 321-269-7587
> >
> >
> > ----- Original Message -----
> > From: "Don Smith" <Don_smith@mail1.myexcel.com>
> > To: <gpetteng@bellsouth.net>; <rp-ml@rapid.lpt.fi>
> > Sent: Tuesday, March 11, 2003 10:41 PM
> > Subject: Re: clear aorta model
> >
> >
> > > Greg:
> > >
> > > Thank you for the encouragement.
> > > I am receiving many responses informing me of the expertise
> > available
> > > to do this, using several methods. Pouring urethane (or
> > silicone)into
> > > a mold is the most common.
> > > Others:
> > > An existing mold for a vinyl aortic arch.
> > > Production process using a variable orifice extrusion
> > >
> > > Don
> > >
> > > Don Smith
> > > Baxter Healthcare Corp.
> > > don_smith@baxter.com
> > > don_smith@mail1.myexcel.com
> > > (847)270-3972
> > > ---------- Original Message ----------------------------------
> > > From: "Greg Pettengill" <gpetteng@bellsouth.net>
> > > Date: Mon, 10 Mar 2003 10:16:26 -0500
> > >
> > > >Hi Don,
> > > >
> > > >Without a much better understanding of exactly what you're trying
> > > to
> > > >accomplish I would be reluctant to make recommendations.
> > > However, I do feel
> > > >that it would be a mistake on your part to reject a "poured"
> > > piece out of
> > > >hand. True, it may take more time and effort then some of the
> > > alternative
> > > >methods, but results are usually far better especially for things
> > > that
> > > >require optical transparency or translucency.
> > > >
> > > >Best Regards
> > > >Greg Pettengill
> > > >Cote' Art & Engineering
> > > >321-269-7587
> > > >
> > > >----- Original Message -----
> > > >From: "Don Smith" <Don_smith@mail1.myexcel.com>
> > > >To: <rp-ml@rapid.lpt.fi>
> > > >Sent: Sunday, March 09, 2003 11:25 AM
> > > >Subject: clear aorta model
> > > >
> > > >
> > > >> List:
> > > >>
> > > >> I am making a model of the Aortic Arch, from the top of the
> > > heart
> > > >> down to and including the bifurcation of the iliacs. The total
> > > >> length of the part is about 22". Requirements are:
> > > >> 1.)ability to see through; (not clear)
> > > >> 2.)pliable (like silicone tubing)
> > > >> 3.)Tear Strength (pumping during lab tests)
> > > >>
> > > >> I plan on using a thin wall z-corp pattern of the bloodflow
> > > scan.
> > > >> Polishing the pattern, and brushing on clear latex. After curing
> > > >> break out the z-corp pattern.
> > > >>
> > > >> I have thought through molding the part using a wax core and RTV
> > > >> mold; and I think the core would be too difficult to register;
> > > and
> > > >> the mold too difficult to fill without getting voids.
> > > >> I have produced a similar part by successive dipping in alphatic
> > > >> urethane, but this produces a part with varying wall thickness.
> > > >>
> > > >> Any suggestions will be helpful.
> > > >>
> > > >> Don
> > > >>
> > > >>
> > > >
> > > >
> > >
> >
> >
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