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 [Tutorial] Casting Your Own Bases

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Lord Xi
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Lord Xi


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[Tutorial] Casting Your Own Bases Empty
PostSubject: [Tutorial] Casting Your Own Bases   [Tutorial] Casting Your Own Bases Icon_minitimeWed 18 Feb 2009 - 16:57

Here is how I created the bases for my warband.

I used 2 part Alumilite Silicone RTV to make my mould. It comes in 1lb packages, 14.4 oz of silicone and 1.6 oz of catalyst. Its a 10:1, which are what the measuring cups are for. 2oz of silicone to one *portion* of catalyst, which is what the little cup and scoop are for.
[Tutorial] Casting Your Own Bases CobblestoneCasting003-1

Here is my positive, of which I will make a negative - my mould.
[Tutorial] Casting Your Own Bases CobblestoneCasting004

I used a small amount of superglue to fix the bases to the tin, then I did a displacement test to see how much silicone I would need to fill the mould. The bigger the mould the more important this becomes, but it comes down to volume, which is l*(h*w). This is easy when your mould doesn't have round corners. In the same token doing a displacement test on a larger project becomes more work than worth since you have to have a completely dry positive. I used my silicone cup and filled it to the 1oz mark, then poured it into the positive, repeating it until its full. I need 3oz of silicone RTV for this mould. The tin is deep enough so that the highest point of the piece is covered by .25" of silicone.
[Tutorial] Casting Your Own Bases CobblestoneCasting005

I mixed the silicone and poured it, and then left it over night. Here is the finished product.
[Tutorial] Casting Your Own Bases CobblestoneCasting007

Once you have a mould you need something to put in it; in this case two part epoxy resin. Following the instructions on the kit, I microwaved the mould until it was 140ºF, then mixed equal amounts of the A and B halves of the resin for 25 seconds. Then I poured into the mould. The mould has to be warm to offset the heat generated by the resin curing. In these small square bases, I don't think it would matter too much, but in large more complex pieces, or thinner pieces the casting heat can cause warpage in the pieces. After three minutes, the new bases were finished and I popped them out of the mould.
[Tutorial] Casting Your Own Bases CobblestoneCasting008

[Tutorial] Casting Your Own Bases CobblestoneCasting009

C&C welcome.
-Xi
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cianty
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PostSubject: Re: [Tutorial] Casting Your Own Bases   [Tutorial] Casting Your Own Bases Icon_minitimeWed 18 Feb 2009 - 17:02

Cool stuff. Thanks for sharing! thumbsup
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Lord Xi
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PostSubject: Re: [Tutorial] Casting Your Own Bases   [Tutorial] Casting Your Own Bases Icon_minitimeWed 18 Feb 2009 - 17:24

No problem. My next project is to distress this first casting and then make a mould of them, for ruined bases.
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PostSubject: Re: [Tutorial] Casting Your Own Bases   [Tutorial] Casting Your Own Bases Icon_minitimeWed 18 Feb 2009 - 22:23

Thanks for sharing! I was just thinking about getting into mold making myself. As you live in the states, can you share where you purchased that mold making compound, and how much it cost?
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Lord Xi
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PostSubject: Re: [Tutorial] Casting Your Own Bases   [Tutorial] Casting Your Own Bases Icon_minitimeThu 19 Feb 2009 - 6:15

The stuff I use I get at Hobby Lobby. The full starter kit has 1lb of the Quick Set silicone RTV and the big bottles of resin, as well as measuring cups, stir sticks, and mould release agent. That cost me $79 USD. The 1lb silicone runs $30 USD and the same for the large bottles of the 2 part epoxy resin. Unfortunately, I paid full price for the starter, an extra thing of resin, and 2 extra things of silicone. Apparently Hobby Lobby has coupons you can print online, up to 50% off. Crying or Very sad
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PostSubject: Re: [Tutorial] Casting Your Own Bases   [Tutorial] Casting Your Own Bases Icon_minitimeWed 25 Feb 2009 - 1:50

Dag, that's pricey. I'd rather just buy a thing of green stuff and do it buy hand.
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Lord Xi
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PostSubject: Re: [Tutorial] Casting Your Own Bases   [Tutorial] Casting Your Own Bases Icon_minitimeFri 6 Mar 2009 - 0:10

Just a little update, I cast 40 of these lil guys here last night, and each set of 5 used less than 3/8oz of resin. Also, the mould temp in this case has a direct correlation to the cure time.
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