HPA-2 Step-by-Step Instructions

HPA-2 is an upgraded version of HPA-1 (Humanly Posable Armature).
This post contains step-by-step instructions for the HPA-2 Kits which can be used to make ball and socket armatures, such as these:

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Delrin Eye Balls for Stop Motion Puppets

I spent the day testing the new arrival – making eyeballs out of delrin ball bearings.
We got them in different sizes: 4mm, 5mm, 6mm, 7mm, 8mm, 9mm and 10mm (quantities of 20 or 100), plus a trial mix pack.

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They are basically very smooth plastic balls which can be used for making eyeballs in stop motion puppets. What makes them special is that they are made out of Delrin.

Wikipedia: Delrin is a crystalline plastic which offers an excellent balance of properties that bridge the gap between metals and plastics. Delrin is used in precision parts requiring high stiffness, low friction, and excellent dimensional stability.

Today I have put them to the test.

What I wanted to check:

1. How easy it is to drill them – to make the holes for positioning the eyeballs.
2. Can they be baked – if the puppet head is made out of polymer clay.
3. How do they look in stop motion animation.

The results:

I used a 1 mm drill bits, but any small size of drill bit will do. We have a variety and also mini drill vises.

Drilling was not a problem at all, the problem was holding the ball. I tried this and that and, eventually, found the best, in my opinion, way – a holding vise made out of 2 joint plates, an M2 screw, and a hex nut. This little contraption allowed me to easily drill the holes.

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After drilling, I just colored the pupil with a marker, but next time I will try something more fancy for the irises. By the way, making the holes with heated needle is also possible (in case there are no drill bits available).

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The melting temperature of Delrin is 375 degrees F (157 degrees C). Polymer clay baking temperature is 275 degrees F (135 degrees C). So I expected the balls to sustain the temperature without problems. And they did – no problem at all.
What is nice is that after the puppet head cooled off, I found that I sculpted the sockets differently.
I could remove one of the eyes from the socket and the second eye was not removable. But they both rotated nicely inside the sockets. Therefore, it is nice option to have – make the eyeballs removable, if needed, or just let them rotate inside the sockets.

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*Sophronia and Harold – Part 2

Continued from Part 1.

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*Sophronia and Harold – Part 1

Hello, friends!
I started a new Humanly Posable project:
Meet Sophronia Prigsey, occupation – “blackmailer”.
Meet Harold, occupation – “adorable chocolate lab”.

“Sophronia” is an old-fashioned Victorian name, it means “discreet, prudent, sensible, having control over sensual desires, moderate and chaste”.

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New Improved HPA-2 Humanly Posable Armature Kits are now available.

Link: HPA-2 Humanly Posable Armature Kits
Happy New Year!

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Morezmore – King and Jester (Part 5)

Continues from Part 4

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Standing Wire Armature for OOAK Doll

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Scale: 1/6, Size: 10.6″ (27 cm)

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