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Old 26-06-2012, 12:48 AM   #1
joeb
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Default Mold making tutorial

Richardlamer made a couple of inquiries about how I make molds so I thought I'd reply with a new thread since it's a bit off topic from the Moon Bus. I put this little tutorial together a long while ago for another forum. The numbers on the pictures don't mean anything anymore and there may be the odd typo that I've decided to live with so please forgive me. Virtually every mold I've made for the Moon Bus and the Eagle was a two part mold. I don't like one sided open molds, I call it slush casting, because they do not yield an exact copy of the original part. The back or open side of the part is either hollow from insufficient resin or mounded over from an excess of resin. The part has to be filled or heavily sanded which if not done very carefully will leave it misshapen. Now if you cover the open side with some non- stick material you run the risk of trapping air and causing a bubble which will also have to be filled. I prefer to make two part molds because the parts that come from them need very little trimming and are exact copies of the original. The little extra time and materials it takes are worth it for me considering the number of castings that I will eventually use. The system that I've demonstrated here has worked very well for the kit pieces. The parts from those molds come out perfect every time, except for the odd one or two. If you have been following the Moon Bus thread you may have noticed that I've changed the mold design for the bigger parts. This system still has some bugs to work out but over all I'm happy with the way it's working out so far. Mold making may seem intimidating if you've never done it before, but it really isn't. It does take an initial investment for materials but once you get the hang of it you'll have a blast.

Joe
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Old 26-06-2012, 12:50 AM   #2
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Here are the rest of the pictures.
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Old 04-07-2012, 02:25 AM   #3
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Yes, indeed. Thank you for sharing your knowledge with us.

Cheers
Eddie
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Old 04-07-2012, 12:12 PM   #4
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You're welcome guys, I hope this was helpful.

Joe
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Old 04-07-2012, 05:38 PM   #5
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Where can I find a pressure tank or a space heater to do my own mold castings?
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Old 04-07-2012, 06:58 PM   #6
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So that's how it's done...

Cheers Joe, there are plenty here including me that will learn a lot from this tutorial.
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Old 04-07-2012, 07:04 PM   #7
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Quote:
Originally Posted by Workshop Artist View Post
Where can I find a pressure tank or a space heater to do my own mold castings?
Harbour freight sell units that can be used look for pressurised paint can. I am sure an electrically heated blanket will work, it's also easy to make up a warm box using a standard 40 watt light bulb as a heat source. I saw a really elegant design with used a steel drum open at both ends up on cinder blocks with a piece of sheetrock as a lid. The base was also sheet rock with a hole to allow the cable for the lamp to pass through it. It doesn't need to be airtight just to get warm and cosy....
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Old 04-07-2012, 07:49 PM   #8
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I have the 2 1/2 gallon tank that HF sells but I mail ordered it from another company long before we got a HF. The tank in the photo is a 7 gal paint pot my boss gave me when he upgraded his spray system. Both tanks had to be modified with ball valves to keep the air in. Paint pots were not meant for that. Make sure the tank you get has a regulator. I charge with air to 40psi. The space heater and heating pad can be had at hardware or department stores.

Joe
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Old 04-07-2012, 11:02 PM   #9
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Just by coincidence, I was using my 2 1/2 gal tank today so I took a picture of the lid with it's valve mods.

Joe
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Old 14-01-2013, 07:36 PM   #10
headcase
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Mold making & casting is a blast! I'm not a pro at it by any means. Maybe that's why it's still so much fun whenever I do it
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