Subscribe
  1. FettTheHunter's Avatar
    Member Since
    Jul 2004
    Posts
    405
    Apr 15, 2006, 7:44 AM - Technical question ? #1

    Hi all

    How many helmet castings do you get from a mould on average ?

    Thanks
  2. MandoMan's Avatar
    Member Since
    Aug 2005
    Posts
    837
    Apr 15, 2006, 12:15 PM - Re: Technical question ? #2

    Yeah, I'd also like to know, since I'm planning to scratchbuild a helmet and cast it.
  3. MARROW SUN's Avatar
    Member Since
    May 2004
    Posts
    608
    Apr 15, 2006, 2:33 PM - Re: Technical question ? #3

    Many factors contribute to the life of your molds. If your casting with polyester your mold will last longer than urethane. Urethane kicks off considerably more heat and is much harder on your molds, you will notice discoloration very early when using urathane, this is your mold absorbing chemicals and breaking down. You can prolong the life of your molds by using mold releases as well you can clean your molds using acetone.
    On top all these factors the type and quality of silicone is important.
  4. MandoMan's Avatar
    Member Since
    Aug 2005
    Posts
    837
    Apr 15, 2006, 2:53 PM - Re: Technical question ? #4

    Not to steal your thread, FettTheHunter, but what if I were to use plaster for the mold? Would that be a really stupid thing to do? I'm just asking because I've seen your work, MarrowSun, and I really admire it.
  5. MARROW SUN's Avatar
    Member Since
    May 2004
    Posts
    608
    Apr 15, 2006, 3:04 PM - Re: Technical question ? #5

    Well with plaster molds your master must be totaly colvered in some sort of release agent otherwise the plaster will stick to it. Doing this you may lose some detail. Also Plaster is heavy and fragile making it difficult to work with in my opinion. Lastly, depending on what you plan to cast it better not have any undercuts otherwise the mold will end up locked into the casting and you will have to physically break your mold to get the copy out.
  6. Zeever Fett's Avatar
    Member Since
    May 2005
    Posts
    303
    Apr 15, 2006, 3:45 PM - Re: Technical question ? #6

    go with aluminum molds
  7. I helped at SDCC '08 GCNgamer128's Avatar
    Member Since
    Jan 2006
    Posts
    5,520
    Apr 15, 2006, 4:17 PM - Re: Technical question ? #7

    Titanium?
  8. FettTheHunter's Avatar
    Member Since
    Jul 2004
    Posts
    405
    Apr 16, 2006, 2:33 PM - Re: Technical question ? #8

    Quote MARROW SUN said:
    Many factors contribute to the life of your molds. If your casting with polyester your mold will last longer than urethane. Urethane kicks off considerably more heat and is much harder on your molds, you will notice discoloration very early when using urathane, this is your mold absorbing chemicals and breaking down. You can prolong the life of your molds by using mold releases as well you can clean your molds using acetone.
    On top all these factors the type and quality of silicone is important.
    I'll be using a sillicone rubber mold with a plaster surround, amd casting in fibre glass, will I be able to get six helmets out of it ?

    Thanks for sharing your knowledge

    Metal molds ?

Similar Threads

  1. Some technical questions
    By Iceheart in forum Zam Wesell Costume
    Replies: 3
    Last Post: Feb 18, 2005, 8:47 PM
  2. Paint Question - Possibly DUMB paint question!
    By Ego in forum Prop Building Workshop
    Replies: 9
    Last Post: Jan 15, 2003, 10:04 PM