Re: clear aorta model

Date: Tue Mar 11 2003 - 16:07:41 EET


Thank you for the reply. I had thought of making a mold with an investment
core to make the part in a flexible silicone or urethane.
Two problems I foresee are,
     1. registering the core in the mold. Buttons about .1" dia. could be
used for this,
     and filled later while the silicone is still fresh.
     2. Filling the mold. With a wall thickness of about .05" and a 22"
     the odds of getting an air void seem too good.
I am now leaning towards brushing on a clear latex over a thin wall
investment. My wall will not be perfectly uniform, but I definitely will
not have voids. My unknowns are; tear strength, and clarity of the latex.

Don A. Smith
Technology Resources
Baxter Healthcare Corp.
Rt 120 & Wilson Rd. - RLP-30
Round Lake, IL. 60073
(847)270-3972 ph.
(847)270-3926 fax

                    "Doug Groh"
                    <dgroh11@comca To:,
                    Sent by: cc:
                    owner-rp-ml@ra Subject: Re: clear aorta model
                    03/10/03 09:26

I am not sure what this physical model looks like, but did you look at
reversing the model to a negative and casting silicon into the void.
To be simply put. It would be like taking a macaroni shaped sla model and
doing a boolean to remove the model shape from a block . You can then cast
into the void and create the macaroni noodle with silicon rubber, or
soft (shore "A" )urethane.
Materialize also allows you take the outer shape, and by doing some
separations you can take the outer and add thickness to it to create a
shell. Then do the same with the inner. place them together and cast into
It is a little more complicated than that, but it is possible.
Doug Groh
3G Services Inc.

----- Original Message -----
From: "James P. Harrison" <>
To: <>; <>
Sent: Monday, March 10, 2003 10:36 AM
Subject: RE: clear aorta model

> We have had a lot of success with this type of work. Give me a call.
> Jim
> James P. Harrison
> Vice President Of Product Development
> 3Dimensional Engineering, Inc.
> 2991 N. Powerline Road
> Pompano Beach, FL 33069
> P: (954) 972-9906
> F: (954) 972-8903
> -----Original Message-----
> From: []On
> Behalf Of Don Smith
> Sent: Sunday, March 09, 2003 11:26 AM
> To:
> 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

This archive was generated by hypermail 2.1.7 : Sat Jan 17 2004 - 15:17:14 EET