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Resin Casting questions http://www.shipmodels.info/mws_forum/viewtopic.php?f=28&t=163394 |
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Author: | gott_cha [ Fri Sep 09, 2016 3:16 pm ] |
Post subject: | Resin Casting questions |
So I want to cast copies of 1/350 carly rafts/floats. Due to the size ( very small) I don't want to make a two part RTV mold...seems like over kill on such a small part. The question is,...Can I just make a Air dry clay mold of the Part/s and when cured and hardened then pour the resin Material into that clay mold to cast the needed parts? Will it react with the clay mold and not form? ..do I need to coat the mold with release agent..or talcum powder.? Any help would be most appreciated. ps...I am using Alumilite system if that matters. |
Author: | merriman [ Fri Sep 09, 2016 3:22 pm ] |
Post subject: | Re: Resin Casting questions |
gott_cha wrote: So I want to cast copies of 1/350 carly rafts/floats. Due to the size ( very small) I don't want to make a two part RTV mold...seems like over kill on such a small part. The question is,...Can I just make a Air dry clay mold of the Part/s and when cured and hardened then pour the resin Material into that clay mold to cast the needed parts? Will it react with the clay mold and not form? ..do I need to coat the mold with release agent..or talcum powder.? Any help would be most appreciated. ps...I am using Alumilite system if that matters. So ... let me get this straight. You're asking how to steal someone's work? Or are you the originator of the master/pattern/part you're going to pull a tool off of? (Yeah, it's my business to know before assisting you). David |
Author: | gott_cha [ Fri Sep 09, 2016 4:20 pm ] |
Post subject: | Re: Resin Casting questions |
Yes David the master is one I fashioned. |
Author: | merriman [ Fri Sep 09, 2016 7:21 pm ] |
Post subject: | Re: Resin Casting questions |
gott_cha wrote: Yes David the master is one I fashioned. Excellent Mark. I'll prepare a tutorial -- will post it over the weekend. Stand by. David |
Author: | biggles2 [ Sat Sep 10, 2016 9:18 am ] |
Post subject: | Re: Resin Casting questions |
For open molds like that I've used plasticene for the mold. Press the master or original into the plasticene for the mold, then pour the Alumilite. These molds are "disposable" as they are deformed and destroyed removing the casting, but you just re-use the stuff for another mold, and so on... Not as accurate as RTV, but a lot cheaper. |
Author: | gott_cha [ Sat Sep 10, 2016 10:12 am ] |
Post subject: | Re: Resin Casting questions |
Thanks for weighing in Biggles. What I need to do is cast 45 oval Carly floats from one master I made. The parts (45-50) are small 1/2 inch and flat bottomed. Too small to utilize a 2 piece mold. I'm thinking just a simple single sided "depression mold". I'm not familiar with Plasticine all I have used has been the Alumilite system,,...what is it and how is it used? You say it's a disposable one time mold? Like the plaster or clay would be I presume. My questioning is how hard it will be to remove the parts once cured.. Also as a note..the copies do not need be perfect in detail (another reason I won't use the Alumilite)....All I need is the size and shape so I can stack them in between gun mounts. I'd like to hear more of your opinion on this even as I wait for Merriman to chime in with a tutorial he's working up. |
Author: | biggles2 [ Sat Sep 10, 2016 7:03 pm ] |
Post subject: | Re: Resin Casting questions |
Plasticene is a children's modeling clay (NOT Playdoh!), usually available at Toys 'r Us and places like that. Platicene never cures or hardens unless you leave it out for around 10 years. Once the casting has cured you just pull the plasticene away from it. You could also chill the plasticene in the freezer so it won't stick too much to the casting. |
Author: | gott_cha [ Sun Sep 11, 2016 3:26 am ] |
Post subject: | Re: Resin Casting questions |
biggles2 wrote: Plasticene is a children's modeling clay (NOT Playdoh!), usually available at Toys 'r Us and places like that. Platicene never cures or hardens unless you leave it out for around 10 years. Once the casting has cured you just pull the plasticene away from it. You could also chill the plasticene in the freezer so it won't stick too much to the casting. Ahh ok thanks Biggles2. Will have to remember that. Can't believe I never heard it called by that name. |
Author: | gott_cha [ Sun Sep 11, 2016 5:16 am ] |
Post subject: | Re: Resin Casting questions |
David, I appreciate the time you spent to answer my question about mold release....the clay (soft non-hardening) already has it! Great. . Also a good reminder on screeding to level out and reduce air bubbles. Many thanks Sir. |
Author: | merriman [ Sun Sep 11, 2016 8:32 am ] |
Post subject: | Re: Resin Casting questions |
gott_cha wrote: David, I appreciate the time you spent to answer my question about mold release....the clay (soft non-hardening) already has it! Great. . Also a good reminder on screeding to level out and reduce air bubbles. Many thanks Sir. My pleasure, sir. David |
Author: | biggles2 [ Sun Sep 11, 2016 9:43 am ] |
Post subject: | Re: Resin Casting questions |
Merriman's modeling clay is just the same as Plasticene under a different name. Casting method is the same as I described. |
Author: | Michael Potter [ Sun Jan 29, 2017 3:00 pm ] |
Post subject: | Re: Resin Casting questions |
To the early question about "original work," the vendor chooses whether to sell the original product with or without copyright. The vendor will only ship the product at a price and on terms that the vendor accepts. The threshold is copyright, not whether something is simply "original work." Provision for copyrights and patents has been in the U.S. Constitution from its beginning. Legislation defines the specific markings and wording to assert a copyright. The cost and effort to assert a copyright are zero. If the vendor declines to copyright the original work or to license it in some way, and still sells the product, then the consumer has the legal freedom to copy. If the consumer then makes copies, the consumer is exercising the paid-up right that the vendor knowingly authorized, and is not stealing the design. A scaled-down model in a publicly-known medium like resin of a public-domain design like a life raft, or an entire warship, might be difficult for a vendor to defend as original work that he can copyright. A model of a licensed private design, like of a car or a fictional character, is different because those designs are (typically) copyrighted. |
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