colekeller Posted November 4, 2019 Report Share Posted November 4, 2019 I recently got a job to make an object that requires a 4-piece plaster mold. The design can be conceptualized as a extruded cylinder along a curved line that abruptly ends and is closed off at one end. The other end which will be open is where I will pour the slip. For some reason I cannot figure out how the air will be displaced as I fill the mold with slip, if you see my attached photo, is it possible to cast this object as it is designed? It's ridiculous that I'm having such a tough time figuring this out. I cannot use a sprue at the end simply because the object needs to be closed on that side. I am wondering if I would be able to cast it as designed and spin the mold around during casting to release the air from the end of the cylinder? I would love to hear how any of you would tackle this. The designed object is extremely simply yet I cannot figure a way to efficiently cast it as illustrated. Any help or direction would be greatly appreciated! Cheers, Cole Link to comment Share on other sites More sharing options...
liambesaw Posted November 4, 2019 Report Share Posted November 4, 2019 You can add a small sprue that will fill fully but allow air to escape? Link to comment Share on other sites More sharing options...
colekeller Posted November 4, 2019 Author Report Share Posted November 4, 2019 Hey @liambesaw, that is a good point. My only concern with this idea would be if the sprue fully casts shut won't the slip still need to be replenished as it is absorbed? Or would that not be a problem? Thanks for the response! Cole Link to comment Share on other sites More sharing options...
liambesaw Posted November 4, 2019 Report Share Posted November 4, 2019 You can try, or you can preload the pouring end and cut it down to size later. Link to comment Share on other sites More sharing options...
colekeller Posted November 4, 2019 Author Report Share Posted November 4, 2019 @liambesaw that is what I will try. Thank you! Link to comment Share on other sites More sharing options...
Rae Reich Posted November 5, 2019 Report Share Posted November 5, 2019 Or cast both ends closed by having your pour hole on the bottom where it can be sealed later when you cut off the ends. You'll probably need some kind of flat area at the bottom, no? Link to comment Share on other sites More sharing options...
Mark C. Posted November 6, 2019 Report Share Posted November 6, 2019 8 hours ago, Rae Reich said: Or cast both ends closed by having your pour hole on the bottom where it can be sealed later when you cut off the ends. You'll probably need some kind of flat area at the bottom, no? yes make the bottom the pouring part(hole) and flip the mold upside down -the bottom can have the hole in it and will hidden and easy to clean up with both ends clearner as you are not cutting one off on poring end. Link to comment Share on other sites More sharing options...
Chilly Posted November 7, 2019 Report Share Posted November 7, 2019 On 11/4/2019 at 10:21 PM, colekeller said: if the sprue fully casts shut won't the slip still need to be replenished as it is absorbed? Will this be solid or hollow? Upside down seems to be the best solution. Link to comment Share on other sites More sharing options...
JohnnyK Posted November 7, 2019 Report Share Posted November 7, 2019 Is this a one-off or will you be making multiples? why does it have to be a 4 piece mold? What are you using as the form for the mold? Link to comment Share on other sites More sharing options...
colekeller Posted November 13, 2019 Author Report Share Posted November 13, 2019 @JohnnyK hey Johnny sorry just saw your comment. The form will be a 3d printed item, and it must be 4 pieces due to undercuts in the object (the previously attached photo is a rudimentary cross cut of the more complicated object). But yes - I will ideally be casting many of these. Thanks for the comment Link to comment Share on other sites More sharing options...
colekeller Posted November 13, 2019 Author Report Share Posted November 13, 2019 @Chilly the object will be hollow with one opening (at the top of attached photo). Thanks for commenting Link to comment Share on other sites More sharing options...
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