Re: Rapid Mold Making

From: David Tolin (david@pmli.com)
Date: Fri Nov 14 1997 - 18:46:49 EET


Yakov Horenstein wrote:
>
> At 21:35 +0100 13/11/97, Pedro Garayo Olarra wrote:
>
> >Is LOM used to make master patterns for investment casting?
>
> LOM patterns are better used for sandcasting, as far as I'm aware, since
> for investment-casting they leave lots of residual ash. In our view, the
> best investment casting pattern material currently available from RP
> systems is sintered polystyrene. This material is available for now only on
> the EOSINT P350 machine, which is not sold in the US & Canada. Since we are
> a service bureau and own one of these machines, my words may be suspect, so
> take it from an article recently published in a journal which states (my
> translation):
>
> "Research carried out at the IKP [part of the U. of Stuttgart, Germany] in
> cooperation with BMW, Mercedes, Porsche and Bertrandt [a German RP SB], and
> 14 German foundries ..... suggests that in using sintered polystyrene as
> pattern material [*], even foundries without any previous experience [of
> using RP patterns], could utilize the new technology without any problems.
> This is in contrast to the use of SLA patterns, where previous experience
> of RP pattern burnout is essential."
>
> [Karl-Heinz Dusel, U. of Stuttgart (IKP), Germany, in "La cera (persa)
> ritrovata", Prototipazione e Produzione Rapida, Sept. 1997, Tecniche Nuove,
> Milano, Italy]
>
> [*] The research focussed on 6 RP pattern materials: SLA, SLS
> (polycarbonate, Trueform, polystyrene), LOM paper, and FDM.
>
> For more information about sintered polystyrene patterns for investment
> casting, please contact us at the address below.
>
> ___________________________________________________
> Yakov Horenstein, Marketing
> Promau Engineering srl
> 155, Strada per Novara
> 28062 Cameri (NO), ITALY
> ------------------------------------------------------------------------------
> Tel: +39 (0)321 510390 [Direct: +39 (0)2 653512]
> Fax: +39 (0)321 616068 [Direct: +39 (0)2 2900 6208]
> E-mail: promau@msoft.it [Direct: yakov@planet.it]
> ____________________________________________________
To All,

LOM is used as investment cast tooling directly at PML, Inc. Standard
investment cast wax is injected directly. We have produced from 50 to
200 waxes off of a tool. Injection pressures are approximately 120 psi
at 150 degrees F. You may have seen our golf club tool that seems to
appear on a lot of advertisements. We have also produced tools as large
as 32"x20"x6" with multiple pieces that must be assembled prior to
injection. Burning parts out of a ceramic shell is costly and timely
and very unpredictable, so we decided not to bother.

-- 
David Tolin
201 W. Beach Ave.
Inglewood, CA  90302
Phone - 310-671-4345
Fax   - 310-671-0858
BBS   - 310-671-1862
Email - david@pmli.com



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