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Streeter1981 Profile
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Sidekick
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How to make a 3D mold


So I saw that tutorial on making the AA Batarang (instructable) but I decided that it would be better to sculpt one the same way and have it function a little differently. I sculpted two different kinds of 'rangs, but here is one:

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I've got the sculpt done and want to mold it up, but this would be my first 3D or two-sided molding/casting and I am not sure how to go about it. I have searched throughout the boards here but can't really find out HOW to do it?

I don't understand whether you just put the thing in a box and pour the stuff around it then cut the mold in half or what? My previous batarang was just one-sided and that is fairly easy to understand. But this I want to be two-sided and just don't get it.
 

[sign in to see URL]'t get how to make the mold in the first place.

2. Don't get how to get the sculpt out after making the mold.

3. Don't get how you would cast (pour in resin) on a closed (3D) mold.


Any help would be greatly appreciated!
8/27/2010, 9:38 am Link to this post Send Email to Streeter1981   Send PM to Streeter1981
 
mooslug Profile
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Re: How to make a 3D mold


You'll need to make a simple 2-part mold. Check out this video:

For the mold box, you can use foamcore and a glue gun. Or even simpler, make it from LEGO bricks.

You'd want to make more mold keys than are shown in the video. A marble is good for this (make hemispherical indentations in the clay).

Last edited by mooslug, 8/27/2010, 1:46 pm
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Streeter1981 Profile
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Re: How to make a 3D mold


That is exactly what I needed -- thank you so much!

Now what is this "foamcore"?
8/27/2010, 2:53 pm Link to this post Send Email to Streeter1981   Send PM to Streeter1981
 
BatDemon Profile
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Re: How to make a 3D mold


foam core in simple terms is 2 pieces of poster board with 1/4" of foam in between. You can find it at art and craft stores, usually near the posterboard.

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efarrell4 Profile
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Re: How to make a 3D mold


i usually just use corregated card board and hot glue to make my mold boxes. Quick and dirty.

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8/27/2010, 7:49 pm Link to this post  
 
Streeter1981 Profile
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Re: How to make a 3D mold


Ahh I did it! Thanks!

I had a really tough time without the clay -- I couldn't really make it perfect at all, but I think it will work.

The foam board really worked great for making the box!

Now I am not sure what to use for the bolt in the middle of the batarang ... The instructable said to use a "furniture joint", but I have no idea what that is! Do I might try to find something in the kitchen hardware area. Any suggestions?
8/29/2010, 1:40 pm Link to this post Send Email to Streeter1981   Send PM to Streeter1981
 
BatDemon Profile
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Re: How to make a 3D mold


looks like it might be a Nut
check the specialized fastener bins

*edit* I looks through all of the Instructables and saw the back of the nut.
It's a Nut

Last edited by BatDemon, 8/29/2010, 3:20 pm


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Streeter1981 Profile
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Re: How to make a 3D mold


Yep I think you're right! I know I've seen those before, I'll try to find some of them.

Thanks again for the help!!
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Re: How to make a 3D mold


should be right. I used the author's description on Lowe's search engine and the lock nuts popped up. emoticon

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Streeter1981 Profile
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Re: How to make a 3D mold


Well, I finished last night, although I need to do some final things like settle on washers, color of lock nuts -- just the final touches. But overall I think it looks pretty good! I really like how it's so easy to open up and lock into position.

Thanks for all the help on this! Couldn't have done it without the help of the BOTB!

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