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GazB

Wheel Replication

4 posts in this topic

I'm considering trying to replicate wheels for an older HEMTT kit I have (the Tanker, which doesn't seem to exist anywhere anymore). I currently have a set of resin ones I'm using on another M977, but these are actually too small in diameter to be entirely correct. Since the DEF wheels I was looking at were both expensive and snapped up almost instantly, I've looked into the possibility of creating moulds of the tyres and hubs from the Italeri M1120, which I also have.

 

I've never done casting before so I'm a little unsure as to the process. I don't really have the ability to buy all of those pressure components and stuff, but I've been looking at this product: http://www.greenstuffworld.com/en/inicio/545-silicone-putty-300gr.html

 

Been wondering what would be easy stuff to pour into it, and what the best way to cast these wheels would be. I've considered assembly of the tyres and hubs, then making three moulds for each of the types. Its how to position the wheels in the mould that I'm wondering about. A single piece mould would provide the best result but, trying to get the wheel out again (I considered adding a small stick to create a channel) is something I'm not sure about. A two piece mould could work but, I don't know how I could pour a liquid into both and get a good result ultimately.

 

Any advice on this would be much appreciated :)

 

Gaz

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Posted (edited)

Doesn't look like a mould to pour this into is of any concern, as its a rather thick putty, kneaded by hand. How I would go about this:

 

Mount the master on a base (which will form your pour block / funnel), modeling a pour gate.

 

Knead up the putty and fully enclose the master and pour doohickey with copious amounts of putty. Set the whole shebang on a flat surface with the pour gate oriented upward, squishing the bottom to form a solid base for later.

 

Once it's hardened, use a fine blade to cut an scour along the pour gate and as far around the perimeter of the wheel as is necessery to work the wheel free from the mould. Pull out the master. Using silicone has the advantage that you can work from single piece moulds, as they stretch and bend easily and snap back into their original shape.

 

Pour to your heart's content.

 

If you don't like "blobby" hand kneaded moulds, you can use what many use for casting liquid silicones: Lego. I'd start as described above, then squeeze the mould into a Lego frame instead of just setting it on a flat surface.

Edited by Hotel Papa
typos / semantics
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6 hours ago, Hotel Papa said:

Doesn't look like a mould to pour this into is of any concern, as its a rather thick putty, kneaded by hand. How I would go about this:

 

Mount the master on a base (which will form your pour block / funnel), modeling a pour gate.

 

Knead up the putty and fully enclose the master and pour doohickey with copious amounts of putty. Set the whole shebang on a flat surface with the pour gate oriented upward, squishing the bottom to form a solid base for later.

 

Once it's hardened, use a fine blade to cut an scour along the pour gate and as far around the perimeter of the wheel as is necessery to work the wheel free from the mould. Pull out the master. Using silicone has the advantage that you can work from single piece moulds, as they stretch and bend easily and snap back into their original shape.

 

Pour to your heart's content.

 

If you don't like "blobby" hand kneaded moulds, you can use what many use for casting liquid silicones: Lego. I'd start as described above, then squeeze the mould into a Lego frame instead of just setting it on a flat surface.

 

Thanks for the advice ^_^

 

Gaz

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Oh, one more thing. I've been looking into the various resins around and they all seem to be large bottles or tins and rather nasty stuff. In fact the only epoxy resin I found that looks like what imagined (with the two syringes), is the AK Interactive water stuff. Everything other one was an adhesive. So I'm wondering, can something like liquid plaster or hydrocal be used, just for ease?

 

Gaz

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