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Molding & Casting

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Positive to Negative to Positive

This week's mission is to design a 3D mold, machine it, use it to cast parts, and mold the designed object.

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Tangible Human Desire

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Eye tracking data visualization

The huge data set of eye tracking have shown people's particular interest towards face and certain body parts. I'm wondering if this human desire would be tangible, how it feels like if I can hold it.

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So I made the eye tracking data of the image above into a 3D visualization, and try to mold it. But after I built the model, I realized the model is too delicate to cast.. So I 3D printed instead.

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Tangible Human Desire

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A Corgi Tag

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Model Design

I'm going to have a Corgi puppy this Friday. His name will be COBU, short for Le Corbusier. So I designed this name tag for him in the form of the iconic circle glasses and his name on it.

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Mold Design

Keeping in mind of the opening for puring in molding material and the pillars for securing the molds, I designed these two parts for the tag.

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XCarve Toolpath

I used one roughing toolpath and two diagnol finishing toolpaths.

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Milling

Glue the block of wax with hot glue along the edges, zero the bit to the X & Y origin of the block, zero the Z axis. Change the bit from 2.2mm to 1.29mm while going from rough cut to finishing cut.

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With out the vacuum in our home brewed CNC machine, we created a huge storm of blue.

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Mix OOMOO

Avoid the bubbles

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Stir

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Pour into mold

With some angles to avoid bubbles

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Wait for 75 min

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Mold ready

The edges of the text and the glasses are too narrow. I should have taken the resolution caused by the bits into consideration.

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Tape it

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Pour the Alloy

We found some our own way of using daily kitchenwares to pour the low temperature alloy.

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First metal casting

Post-processing

The surface of the alloy turned out to be very rough, so I tried to use a hot gun to blow it to shiny and smooth. I used the soldering tool to cut the extra alloy at the bottom. I found I can actually just use the soldering tool to melt the alloy and put it into the mold, but it turned out to be very bubbly.

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Sythetic Nuts

I want to try mixing epoxy with inks and various textures, and wonders how it would be like in the shape of walnut or cashew. So I threw the nuts in oomoo to get the mold. It turned out that the epoxy needs 24 hours to cure, so I'll put it here later. The Smooth-cast 300 only need 3 min to cure, which is the blue cashews shown below.

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