Colin K Posted December 30, 2016 Share Posted December 30, 2016 Hi guys. I have a resin ejection seat that you cannot get anymore, but I would like to make a mold, so I can cast a couple of extra copies, for my own use. Can this be done using a one part mold, or am I looking at a two part mold? Thanks. Quote Link to post Share on other sites
Janissary Posted December 31, 2016 Share Posted December 31, 2016 (edited) Assuming it's an intricate seat with protruding details, I'd say a two part rubber mold cutting down the symmetry plane. Removing the cast seat from a single mold is likely to be difficult as the undercuts will likely be in the way (even if the seat is upside down when removing). However if you intend to make only a single copy (or a handful), use a single rubber mold all the way as you can destroy the mold to remove the seat. Edited December 31, 2016 by Janissary Quote Link to post Share on other sites
Darren Roberts Posted January 2, 2017 Share Posted January 2, 2017 Glue the seat down to a medium thickness sheet plastic with white glue. "Paint" the seat with with RTV with a brush you don't use anymore. Let that set completely. Then, make a box of Lego's around the seat and fill it with RTV. Seal the bottom of the Lego box with clay. When that sets completely, remove the Legos from around the mold. You may be able to pull the master out of the mold, but if you want to be sure, you can make two slices down the sides. This allows you to retain a single piece mold but still have the benefits of a two piece mold. I've pulled GRU-7 seats out of a single piece mold. When you pour the resin, you just need to make sure to go "fishing" with a toothpick to dislodge any air bubbles. Quote Link to post Share on other sites
AlienFrogModeller Posted January 14, 2017 Share Posted January 14, 2017 Mold Questions....where would a person buy this stuff in Ottawa? Would someone have pics of a mold product easily avail here in Canada; just incase I have to order it specifically. Thanks in advance. Quote Link to post Share on other sites
MoFo Posted January 15, 2017 Share Posted January 15, 2017 https://www.greathobbies.com/ should have Alumilite RTV in Ottawa. http://www.leadingedgehobbies.com/ has both Alumilite and Smooth-On in Kingston. http://www.sial-canada.com/ Has Smooth-On in Montreal. If you're willing to look at the GTA, there will be a bunch of suppliers, including http://www.sculpturesupply.com/ http://plasticworld.ca/ and http://www.compositescanada.com/ Quote Link to post Share on other sites
Bozothenutter Posted January 15, 2017 Share Posted January 15, 2017 With regards to the airbubbles... I have always used a tupperware container connected to a vacuumcleaner....always worked a treat. Quote Link to post Share on other sites
AlienFrogModeller Posted January 15, 2017 Share Posted January 15, 2017 7 hours ago, MoFo said: https://www.greathobbies.com/ should have Alumilite RTV in Ottawa. http://www.leadingedgehobbies.com/ has both Alumilite and Smooth-On in Kingston. http://www.sial-canada.com/ Has Smooth-On in Montreal. If you're willing to look at the GTA, there will be a bunch of suppliers, including http://www.sculpturesupply.com/ http://plasticworld.ca/ and http://www.compositescanada.com/ Perfect...Thanks so much! 6 hours ago, Bozothenutter said: With regards to the airbubbles... I have always used a tupperware container connected to a vacuumcleaner....always worked a treat. I can't see how this would come together. I would like to see how this would work together. Have any pics? or s detailed explanation? Quote Link to post Share on other sites
Bozothenutter Posted January 16, 2017 Share Posted January 16, 2017 No pics atm, but basically I cut a hole in the side of a large container, used some spare rubber profile to cover the edges and stuck the hose in there. Use double sided tape to hold the mould in place put the cover on and turn on the vac. Quote Link to post Share on other sites
Pierre Sacha Posted January 16, 2017 Share Posted January 16, 2017 On 1/15/2017 at 7:45 AM, Bozothenutter said: With regards to the airbubbles... I have always used a tupperware container connected to a vacuumcleaner....always worked a treat. I do the opposite again in that I use a spray painters pressure pot, place the resin filled mold inside and pressurize it with my airbrushing compressor to about 40 psi. I found that the wet resin reaches even the smallest nooks and crannies of the mold this way. Quote Link to post Share on other sites
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