Rigs generally look like sprues, really.
Here's a rig I just built for some mini tanks. I'll stick it to the side of a moulding box, then cut it out later.
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| Two-piece molds http://www.tacticalwargames.net/taccmd/viewtopic.php?f=7&t=20516 |
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| Author: | Spectrar Ghost [ Tue Apr 05, 2011 10:58 pm ] |
| Post subject: | Two-piece molds |
What do people use for setting models into to pour the first half of a two piece mold? Ideally I'd like something reusable. The employee at Blick's suggested a product called Earth Clay, but I'm wondering if something like a bake-to-set modeling clay would work. |
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| Author: | Evil and Chaos [ Tue Apr 05, 2011 11:03 pm ] |
| Post subject: | Re: Two-piece molds |
I don't do two part moulds. I suspend the model, pour silicone all around it, then physically cut the mould plane with a knife. |
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| Author: | Spectrar Ghost [ Tue Apr 05, 2011 11:04 pm ] |
| Post subject: | Re: Two-piece molds |
Doesn't that run the risk of damaging the master? My understanding is silicone has a mold life of around sixty casts, max. How do you suspend it? |
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| Author: | Angel_of_Caliban [ Tue Apr 05, 2011 11:08 pm ] |
| Post subject: | Re: Two-piece molds |
Evil and Chaos wrote: I don't do two part moulds. I suspend the model, pour silicone all around it, then physically cut the mould plane with a knife. Ohhh Fancy! |
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| Author: | Evil and Chaos [ Tue Apr 05, 2011 11:12 pm ] |
| Post subject: | Re: Two-piece molds |
Spectrar Ghost wrote: Doesn't that run the risk of damaging the master? Yeah, I guess. Try not to stab it. :-) Quote: My understanding is silicone has a mold life of around sixty casts, max. Depends on the model. Sometimes more, sometimes less. Quote: How do you suspend it? I build a rig, that will act as the feed lines for the resin when it is removed from the mould. |
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| Author: | zombocom [ Tue Apr 05, 2011 11:13 pm ] |
| Post subject: | Re: Two-piece molds |
E&C is right that one-part moulds are generally better, but if you really insist, Play-Doh can be used to sink the models into to pour the first half. |
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| Author: | Spectrar Ghost [ Tue Apr 05, 2011 11:15 pm ] |
| Post subject: | Re: Two-piece molds |
Seems possible. Could be too risky with models that can't simply be reprinted (i.e. handmade). Do you have a pic of a rig? I'd like to see how you do it. |
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| Author: | Dobbsy [ Tue Apr 05, 2011 11:23 pm ] |
| Post subject: | Re: Two-piece molds |
Me too! |
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| Author: | Evil and Chaos [ Tue Apr 05, 2011 11:26 pm ] | ||
| Post subject: | Re: Two-piece molds | ||
Rigs generally look like sprues, really. Here's a rig I just built for some mini tanks. I'll stick it to the side of a moulding box, then cut it out later.
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| Author: | Spectrar Ghost [ Tue Apr 05, 2011 11:29 pm ] |
| Post subject: | Re: Two-piece molds |
Oh, I see. So you just glue that to the side of the box. What would you do for a model that has no sprue? I'm going to be attempting to cast my Warbarques. |
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| Author: | Evil and Chaos [ Tue Apr 05, 2011 11:30 pm ] |
| Post subject: | Re: Two-piece molds |
Quote: What would you do for a model that has no sprue? I'd make a sprue. :-) |
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| Author: | Spectrar Ghost [ Tue Apr 05, 2011 11:33 pm ] |
| Post subject: | Re: Two-piece molds |
Helpful and sarcastic! Super. Slightly worried about the amount of contact with the box required for a model the size of the 'barques, but I'll experiment. |
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| Author: | GlynG [ Wed Apr 06, 2011 12:03 am ] |
| Post subject: | Re: Two-piece molds |
Sounds interesting and there is a shortage of them, what do your Warbarques look like? |
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| Author: | Spectrar Ghost [ Wed Apr 06, 2011 12:09 am ] |
| Post subject: | Re: Two-piece molds |
This.   This particular one was a commission model that's since moved to it's final home. However, the design is pretty simple, and I'm planning on doing only one more and casting it for the two more I need for another local player, and anyone else who wants one. May also do another Tomb Complex:  Finally, the last of the two local comissions are Abbatoirs. Probably get a model I'm happy with and dip it in rubber as well... |
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| Author: | GlynG [ Wed Apr 06, 2011 12:18 am ] |
| Post subject: | Re: Two-piece molds |
Looks good! I reckon I'd be interested in 1-2 of those 
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