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  #1  
Old 11-13-2015, 11:26 PM
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spookysully spookysully is offline
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Attaching limbs to a torso?

Hello all,

I've no jargon to use in this instance so please forgive my ignorance...
I'm trying to attach limbs to a torso. I cannot figure out how to put pics from my pc up on this site and every url I provide is apparently invalid so I'll just have to deal with my limited jargon.

I have a torso and 4 limbs (2 arms, 2 legs)for a piece I hope to copy and sell. Each limb is rounded at the point it will be attached to the torso and each hole on the torso has a cup or bowl matching its limb.

I'm working with a combination of Chavant Castilene and Chavant NSP (probably irrelevant) and am at the point where I need to decide on how to attach these limbs before I make the molds. I was entertaining the thought of attaching a lego piece maybe? So each limb would "snap" into place? Each limb will be static and not movable but I want them to be strong. I hope this is understandable.

Many cheers, Cliff
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Old 11-13-2015, 11:27 PM
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spookysully spookysully is offline
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Re: Attaching limbs to a torso?

https://www.facebook.com/squatch.art...37068963095082

Is the link to my fb page where I put the pics up to use here...
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  #3  
Old 11-14-2015, 03:16 PM
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Chris_Johns Chris_Johns is offline
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Re: Attaching limbs to a torso?

I assume that you want to cast the limbs separately and attach them afterwards. You don't mention the final material but there are a few options which should work with most materials.

If you want a removable fixing then neodymium magnets can be a good option if the parts slot together positively. Depending on the material they can either be glued on or you can get magnets with countersunk holes which can be screwed in place.

For permanent fixing a combination of adhesive and metal pins can be a good option for attaching limbs and similar. For smaller pieces you can make pins from short lengths of metal rod or wire, for larger heavier bits threaded rod can give a bit more strength to the joint.

Depending on your casting process it might also be worth embedding the pins into the mould itself.
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Old 11-14-2015, 05:15 PM
raspero raspero is offline
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Re: Attaching limbs to a torso?

Quote:
am at the point where I need to decide on how to attach these limbs before I make the molds.
My interpretation of what you want to do is that you have made the arms and legs in clay and now want to attach them to the clay torso before you make a mold. (I assume the mold will be rubber.) If that is the case, I am wondering why the joints need to be strong. A simple metal or wood pin would do, or even just the stickiness of the clay. To make a rubber mold, the only strength the clay model needs is to be able to support its own weight without de-forming itself.

Am I missing something?

Richard
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Old 11-14-2015, 08:59 PM
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spookysully spookysully is offline
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Re: Attaching limbs to a torso?

Thanks so much for responding and I apologize for not being clear enough. I have to cast them all separate and attach them after the molding process. The only reason I'm even going this route is because of the length and shape of his limbs, while attached to the torso, being pulled out of a mold would be difficult at best, if not impossible.

The materiel will likely be a resin and very strong. I like the magnet idea but expense will also play a role in making copies and selling for a profit... A factor for sure.

Thanks so much again for taking the time to help out! I was thinking of using a leggo piece and gluing it in? Attaching a 4 peg leggo to each limb with the "female leggo fitting" on each limb hole on the torso. Again, I hope this makes some kind of sense to you.

Cheers
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  #6  
Old 11-15-2015, 05:23 PM
raspero raspero is offline
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Re: Attaching limbs to a torso?

So from that I gather you plan to use a solid (hard) mold material to cast multiple pieces in production.

Why not use rubber and cast the figure in one piece in the rubber mold? A good silicon mold would last for a lot of castings and would eliminate the multiple piece problem. Polyurethane would work fine too but if you are going to use polyurethane resin for the finished piece you would have to be very careful with your mold release.

Unless of course I am missing something here.

Richard
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  #7  
Old 11-16-2015, 10:18 PM
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spookysully spookysully is offline
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Re: Attaching limbs to a torso?

Yes, I plan to use heavy, durable resin to cast them in. I'm very inexperienced with making, casting and finishing molds but am very eager to learn so I'm willing to try any advice you might share! I'm bound to youtube videos and online help due to my location (Thailand) and just how little Thai I actually speak. I get along ok but with specific, hard to explain things like mold making materials, I'm a bit lost.

No worries and thanks again for the input, I appreciate your taking the time to help me. Cheers
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  #8  
Old 11-17-2015, 04:06 PM
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Chris_Johns Chris_Johns is offline
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Re: Attaching limbs to a torso?

There is definitely a reasonable argument for casting the limbs separately to simplify the mould making process and it's a common enough thing to do with complex models like figures.

The problem with using something like lego is that you are committing yourself to a needing a very precise fit and alignment and any issues like shrinkage or slight warping of the mould could land you with problems which wouldn't otherwise be noticeable.

My approach would be to make the pattern so that you get a reasonably positive fit, but allow a bit of room to remove material after it's cast to refine the fit and go for a mortice and tennon or peg type joint which you secure with adhesive.

Depending on how much room you have to work with you could either make the peg and hole as part of the model or drill holes and use a metal pin afterwards as part of the final assembly.

As part of your general research it's probably also worth looking at the way that commercial resin model kits are designed for assembly eg

http://www.forgeworld.co.uk/en-GB/Ky...gine-of-Khorne
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