[Jewelry making - Article 01370] - Re: [Orchid] vulcanized vs. RTV

[Daniel Grandi]

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>     However, the original wax or SLA is at risk if you need to invest
>     it in the model making process. Many original waxes are lost at
>     this point. Many folks think that the original wax is at lower risk
>     for loss if it breaks in the mold cutting process. Why? because you
>     still have the mold from which to shoot copies. 

    Hi Bill, We do tend to agree with each other .. I just like to make
    sure that All people  on orchid understand exactly what is invoved 
    when manufacturing. Many are not aware of various processes. Many
    have dealt with casters and casting companies that don't give enough
    accurate information ..Some of theses casters are not model makers
    and don't do finished products... many don't do Hand polished high
    quality finished products which we do . 

    In my previous post, I did make mention to use RTV molds to make the
    production models... In otherwords... make an RTV of the wax or SLA
    pattern... cast a wax from the mold into metal and perfect that
    pattern. This perfected casting now becomes the production model 
    that can be copied in any rubber and as many molds as you wish can
    be made from it without any problems. This also guarantees a better
    model since the cast model  can be perfected beyond what is capable
    in wax or SLA. To do this, It is important to know the shrinkages of
    the molds, waxes and castings. I deal with these problems on a daily
    basis.... we get some 20 models a day sometimes and these come as
    carved waxes, SLA's ,metal models tree bark and what have you...often
    over 200 molds /week are made . 95 % of the models we get in wax are
    definitely not ready for production mold making and require extra
    work in the metal model to truly make a great casting. These are
    just some of the reasons why our customers like the casting and
    finishing work that we do for them... we try and cover every detail
    as best we can so that their finished product comes out the way they
    would like. That is also why  , as a Manufacturer we  would not
    recommend RTV 'ing a wax and using that mold for production ... only
    to create the production models in metal 

    I believe we both agree that making an RTV of the wax and producing
    a metal model  is the best way to go...for production. 

    I would certainly like to try your platinum rubber  as I'm sure we
    will have good uses for it. 

Best Wishes,
Daniel Grandi     
Racecar Jewelry Co. Inc.     
52 Glen Rd. Cranston, RI 02920    
contact: sales AT racecarjewelry.com
Tel: 401-461-7803


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