6 Comments

Joe Blow (Part 5 – Head Mold)

Continues from Joe Blow (Part 4 – Head)

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Another attempt at the face plates, starting with brand new mold, and a brand new mold making method (at least for me).
I have been trying to figure out to make the reusable mold box, which will be not as wasteful as cardboard, but still affordable. So this is the step by step description how to make it.

Also, this is a 3-part mold. One part – the face only, 2 parts for the back of the head – to deal with inevitable undercuts.

Here is Joe’s head again, patched up. He looks rough, been through a lot. But he is ok for the mold purposes.
As usual, I am using stuff that we sell at Morezmore and will name them as I go.
plasticine
clay roller
rib tool blade
glass tiles

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That’s the one” tool

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mold keys
That rib tool blade removes the residual plasticine from the tiles very efficiently.

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Vaseline petroleum jelly
oval mop smoothing brush

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This photo just below is important. In order for the box to work, the tiles should be positioned like this – look at the top corners

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Here I am using orange oil which is good for dissolving, cleaning and smoothing out plasticine. However since then I switched to ZEP Heavy-Duty Citrus Degreaser which does this job even better.

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So the box is water-tight now.
Next – Ultracal 30 Gypsum Cement.
In order to minimize the waste, the cup for mixing Ultracal should be somewhat flexible so it would not crack if I squeeze it. After the cup is emptied, there will be some residue on the walls and it will harden. By flexing the cup, dry remnants of Ultracal flake off easily and the cup is good to use again. Cups like that can be found at grocery store salad bars.

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Semi-flexible long nylon spreader spatula. It does a great job of scraping the walls, flexes to flake off hardened Ultracal. Also, it is most used tool in our kitchen. Thin and stiff, with just a tad of flexibility, absolutely indispensable sandwich spreader, pancake flipper, frying stirrer, jar scraper, works as a bread, butter, cheese knife too. Heat-Resistant and dishwasher-Safe.
Ultracal proportions – 38 gram of water to 100 gram of Ultracal.

The easiest way is the following:
1. Put the cup on the scale and press “Tare” – it will set the scale to 0.
2. I am making 4 “portions” of Ultracal, so 38×4=152. Pour 152 gram of water.
3. Without taking off the cup from the scale, press “Tare” – it will set the scale to 0.
4. Pour 400 gram of Ultracal.

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Mix rapidly at first for a minute or so and then stir slowly for another 2-3 minutes.
Tap on cup to bring the bubbles to the top.

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Pour into the mold and leave alone for 60-80 minutes.

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First demolding.

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Cut off half of the plasticine exactly on the middle of the head. Watch out for undercuts and fill them with plasticine if necessary. Like the square tube sticking out of the neck.

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The third part of Ultracal is actually on top of the 2 part of the mold – to make them the same height. They will break off at the plasticine “divider”.

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2nd and 3rd part of the mold is held together with a heavy duty mold rubber band 4″

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Ok, I am ready to start my experiments with the face plates.

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Continues on Part 6 – Replacement Faces.

To be continued…

6 comments on “Joe Blow (Part 5 – Head Mold)

  1. Natasha –
    Why do you need 3 part mold?
    Why not use silicon rubber for the mold?

    Like

  2. Hi, Natasha!
    Why not a 2-part mold, in Silicon Rubber?

    Like

  3. For a mold frame you should use a metal sheet or some poster board

    Liked by 1 person

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