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
> "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: firstname.lastname@example.org [Direct: email@example.com]
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 - firstname.lastname@example.org
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