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Re: [casting] Looking for less warp

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  • Edward Hunt
    Finally ! Keep channeling ! With lucid descriptions like that we needja (him?).......badly :-) Thanks and........ CHEERS ELH ________________
    Message 1 of 6 , Jun 1, 2000
      Finally ! Keep channeling ! With lucid descriptions like that we
      needja (him?).......badly :-)

      Thanks and........

      CHEERS
      ELH
      ________________
      Countryside Models wrote:
      >
      > >From a reaction chemistry perspective, the reaction rate for these polymers
      > is faster at elevated temperature and higher temperature is achieved with
      > greater mass of material. Thick pieces and solid bodies get down right HOT!
      > While thin sections, like HO scale walls may get only luke warm. The volume
      > increases by the cube (3rd power) of a dimensional increase and so you
      > generate a great deal more heat in the larger volume; and while the volume
      > increases by the 3rd power, the surface area available for heat dissipation
      > only increases by the square (2nd power).
      >
      > Regards, Ed Novit
      > (I was a B.Sc.Chemical Engineer in my previous life)
      >
      > ----- Original Message -----
      > From: Craig J Bisgeier <cbisgeier@...>
      > To: <casting@egroups.com>
      > Cc: <casting@egroups.com>
      > Sent: Wednesday, May 31, 2000 9:21 AM
      > Subject: Re: [casting] Looking for less warp
      >
      > Craig Bisgeier wrote...
      > > If what I've read recently is to be believed, resins poured in thicker
      > > layers harden faster than in thin layers. I have read it has something
      > > to do with the amount of resin available in three dimensions, that having
      > > more liquid resin in a thick area promotes more area available for the
      > > chemical reactions to begin. In my very limited experiments so far the
      > > resin begins setting up in the deepest parts of my mold and works out to
      > > the edges from there.
      > >
      >
      > ------------------------------------------------------------------------
      > “How this web site saved me 72% on CDs and movies”
      > --------------------------------------------------
      > http://click.egroups.com/1/4737/3/_/13868/_/959827358/
      > ------------------------------------------------------------------------
      >
      > Don't forget to e-mail pat at: miracle-castings@... with photos of your castings for the web site. Also, please let him know who your suppliers are.
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