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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

Screen Shot 2019-11-04 at 12.55.35 PM.png

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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.

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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.

 

 

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@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 :)

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