For an assignment I am making a concrete model that is of a curved shape. I am unsure how to get the hollowed bits, either how to create my own mould for the design or how to cut fine details into the concrete to get the adequate shape?
SOS
thisisnotmyname
Sep 4, 17 11:32 am
Pour the shape in plaster and paint it gray.
If you must do it in concrete, allow LOTS of time for trial and error in the process. You will probably have to build the form and pour more than once. Don't wait till the night before.
randomised
Sep 4, 17 1:19 pm
Do you have a picture of what you need to make? Maybe there's something here, I don't know I just googled.
Thank you, I will have a look at these, they seem to have a bit of useful content
espacio01
Sep 4, 17 8:30 pm
A common process is to build positive model from foam, 3d print, or whatever material. Cast a rubber mold around the positive (ive used Smooth-On brand mold making rubbers, of which there are multiple varieties of hardness etc). Things may have to be re designed or re oriented from your original geometry to allow adequete mold release at each stage. But then you have a reusable mold that you can cast into with a variety of materials (plasters, resins, etc). It takes a bit of practice and material knowhow - if you can, ask nicely around your school / shop or others you know with experience
saleneh
Sep 5, 17 12:56 am
This is a rough drawing of the design I am trying to make! thanks guys ill try do what I can to make a mould for it
Mitch L
Sep 5, 17 10:16 am
looks complicated to cast as one piece, depending on the scale - any interior returns or even vertical faces such as steps can be difficult to get to fully fill without air bubbles, and to release. may want to make separate molds for each component.. or just make the final positive model by hand and then paint as someone else mentioned
For an assignment I am making a concrete model that is of a curved shape. I am unsure how to get the hollowed bits, either how to create my own mould for the design or how to cut fine details into the concrete to get the adequate shape?
SOS
Pour the shape in plaster and paint it gray.
If you must do it in concrete, allow LOTS of time for trial and error in the process. You will probably have to build the form and pour more than once. Don't wait till the night before.
Do you have a picture of what you need to make? Maybe there's something here, I don't know I just googled.
https://www.smooth-on.com/howt...
https://www.concretenetwork.co...
http://www.homemade-modern.com...
Thank you, I will have a look at these, they seem to have a bit of useful content
A common process is to build positive model from foam, 3d print, or whatever material. Cast a rubber mold around the positive (ive used Smooth-On brand mold making rubbers, of which there are multiple varieties of hardness etc). Things may have to be re designed or re oriented from your original geometry to allow adequete mold release at each stage. But then you have a reusable mold that you can cast into with a variety of materials (plasters, resins, etc).
It takes a bit of practice and material knowhow - if you can, ask nicely around your school / shop or others you know with experience
This is a rough drawing of the design I am trying to make! thanks guys ill try do what I can to make a mould for it
looks complicated to cast as one piece, depending on the scale - any interior returns or even vertical faces such as steps can be difficult to get to fully fill without air bubbles, and to release. may want to make separate molds for each component.. or just make the final positive model by hand and then paint as someone else mentioned
Make wood casings, they don't stick to concrete.