From: Greg Pettengill (gpetteng@bellsouth.net)
Date: Wed Mar 12 2003 - 09:03:32 EET
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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