RE: Low Durometer RP Materials

From: Deak, Steve (
Date: Fri Sep 26 1997 - 15:15:16 EEST

Kevin :

I certainly will post my findings to the rp-ml. The last time I sought
info on STL and CAM Packages, I did post a summary to the list. I agree
entirely with you on the issue of posting results.

We have in-house resources for RTV Silicone rubber molding, casting and
injection molding. In fact, we've done some direct AIM tools and
aluminum tools for this effort in the past. This latest go-'round has
about 10 different configurations (really) in the 60A durometer range
and I'm trying to weed out the bad ones before committing time and labor
to making tools (even AIM tools) and molded parts.

I believe the DTM/Somos material will perform most of what we want in an
RP working prototype. However, I was looking for any other direct
alternative there may be. SL Dupont resin and FDM were probable
candidates to fill the bill, but I did not know if these were successful
in practice.

As of this morning, I have what looks to be 2 immediate solutions.
General Pattern is running the SOMOS 2100 series resins in the SLA. The
second is the DTM/Somos material. A third yet to be investigated is an
FDM Material shown at the SFF conference by researchers at Virginia Poly

Thanks to all who responded. I will do some digging and let the list
know the results.

Steve Deak e-mail:
Manager-Rapid Prototyping voice: (+1) 513-579-3270
Hasbro Toy Group fax: (+1) 513-579-3250
615 Elsinore Place
Cincinnati, Ohio 45202 USA "Our Business is Fun!"

> ----------
> From: Kevin Robertson[]
> Sent: Thursday, September 25, 1997 8:39 PM
> To: Deak, Steve
> Cc:
> Subject: Re: Low Durometer RP Materials
> At 05:29 PM 9/25/97 -0400, you wrote:
> >I'm looking for an RP service provider to produce a direct soft
> suction
> >cup-like part. I know of the DTM/Somos material, but are there other
> >processes (FDM and SL, etc) with smooth surface finish which could be
> >used and hold a small weight and a slight vacuum (highly descriptive
> >terms, eh?)?
> >
> Steve,
> We can do an SLA and urethane or silicone rubber part very rapidly. If
> the
> part configuration is better for machining we can CNC a part then cast
> it.
> This can be done in as little as a few days, so I'll consider it RP
> though
> not direct. Let me know if we can be of assistance.
> On a related subject, I would like to make a comment regarding
> postings of
> this nature. This type of assistance has been requested over the rp-ml
> for
> assistance from service providers. I've offered help or have provided
> vendor
> names on several occasions. Not once has anyone replied to the offer
> or
> indicated how they resolved their problem. Out of common courtesy,
> could
> these results be posted as a benefit and educational tool to the users
> group????
> Having gotten that off my chest, enough said and good luck Steve.
> Regards,
> Kevin Robertson
> ARRK Creative Network

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