Beautiful, best thread on the RPF!
Cronos - Vampire Device! Progress thread!!!
- Thread starter RelicMaker
- Start date
AdamHunter
Active Member
Looks incredible! What do you generally use for mold material for your metal casting?
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I plan on doing a run in Pewter, which will then be 24k Gold-plated.
Excellent. How will you go about that first Copper and Nickel coat than Gold? Do you outsource that ?
I'm more interested to know what kind of mold material will stand having molten metal poured into it? I know pewter melts at lower temperatures than ali or steel but even so it's still very hot. Does a regular silicone mold material stand those temperatures or do you need some sort of vulcanised rubber solution?
Excellent project and fantastic modelling skills by the way. A real inspiration.
Excellent project and fantastic modelling skills by the way. A real inspiration.
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Something like Mould Max 60 will go to 290C(ish) I think, which is enough to hold molten pewter. It wont last super long (heat kills moulds) but will stand up to a decent number of pulls. If you want hotter or longer lasting I think you do have to move into the rubbers or have to do one off investment/sand castings.
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I outsource my gold-plating. These are nasty chemicals I prefer not to be around or mess with...
I use Moldmax 60 for the metal molds. Thanks!
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I found the issue there is to control the pewter temperature just above melting. It gets easily too hot and then Moldmax 60 will degrade more quickly. Also if you have too much volume in the cast so that it takes a longer time to cool down. I use Moldmax 60 also to cast silicone boots for my 3D printer hot end. They last 6 month to a year, good stuff.
Which is your favorite pewter composition? Do they have restrictions on which pewter alloy can be used for the process? I am always curious to learn about the experiences artists have with different compositions and retention of model detail.
I use a lead-free pewter that has some silver in it. I think they can gold-plate any metal.
Interesting I only used the Tin alloy that has some Copper and Bismuth for low melting temp. Can I ask were you get the tin silver alloy and what the melting temp is?
QUOTE=RelicMaker;4514252]I use a lead-free pewter that has some silver in it. I think they can gold-plate any metal.[/QUOTE]
QUOTE=RelicMaker;4514252]I use a lead-free pewter that has some silver in it. I think they can gold-plate any metal.[/QUOTE]
C0mmand3rC0dy
Sr Member
So glad this is still being done...I think I'll watch the movie now lol
Hallmark Metals, and the melting point is around 450.
The pewter type is NL7 Pewter. They have another one that has even more silver, but is a little more expensive.
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Thank you. I checked this out and NL7 doesn't list silver in the composition but antimony, copper and bismuth so it should be fairly hard. I guess you mean MPK 0.2% silver or NL5 0.35 % silver? Seemed to be reasonable priced although you have to buy 7lbs bars. Haven't made metal props yet but it is tempting to cast some of my 3D models.
No updates yet, since I'm working on multiple projects at one time. I should have something to show soon!
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Thanks! Much appreciated!
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