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Making moulds (Read 6742 times)

Rockman

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Making moulds
Jan 24^th, 2009 at 2:57pm

I am intrested in making a few lead glandes for my slinging, so I need a mould. I know lead is toxic, so I don't plan to do it all the time, just now and then.

I plan on using white concrete on a small box, introducing the model glande half way through, wait until it dries. Then a coat of vasseline and a second layer of fresh concrete. I am assuming that the concrete will endure the heat.

But this is something I've come up with. I don't know if it will work, so any tips or advice from anyone who has succesfully made glandes (and their moulds) without anything complicated like wood carving.

Thanks in advance

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Aussie Past Moderator Offline Joined Nov. 1, 2006 Luke 14:14 Posts: 3265 Melbourne, Australia Gender:	Re: Making moulds Reply #1 - Jan 24^th, 2009 at 5:30pm Elongated fishing sinkers are pretty much exactly the same shape as all the photos of lead glandes I have seen. You should be able to purchase a ready made sinker mould to your liking which will last a lifetime.
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Bikewer

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Re: Making moulds
Reply #2 - Jan 24^th, 2009 at 7:21pm

Take a look at this page of sinker mould designs:

http://www.do-itmolds.com/category2.aspx?c=10

Any number of these would make fine projectiles.

I cast bullets for years; just do it outside. You can buy a fancy electric melting pot, or a simple cast-iron pot and a propane or blowtorch.

I had a silly-looking rig that consisted of a sheet-metal shelf to hold the pot, and a Sears blowtorch. A gallon of kerosene will make many thousands of bullets.

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David Morningstar

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Re: Making moulds
Reply #3 - Jan 25^th, 2009 at 6:14am

There is something on clay molds here: http://www.mbsks.franken.de/slinging/slinging.html

Creating cement molds here:http://slinging.org/forum/YaBB.pl?num=1210596814

Quote:

I found out that covering prototype form in candle wax (dipping it in melted hot candle wax) till about 1-3 mm of thickness is the way to go.
When prototype glande covered with wax has stayed long enough in cement form "cups". I put it into oven to melt wax. So top bottom and prototype gland could be separated.

I am also gathering information begin lead casting. The key things seem to be:

Do it outside, use the breeze to keep lead fumes away from you

The mold must be completely dry, any trace of moisture will come fizzing out as steam and spray molten lead everywhere

The mold must be hot to get good casts - the first one or two casts will achieve this, just chuck the results back into the melting pot.

Safety glasses, non artificial fibre long sleeves and a heavy leather glove are all good to have

Wash your hands after handling lead

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Rockman Interfector Viris Spurii Offline Slinging Rocks! Posts: 1267 Lima, Peru Gender:	Re: Making moulds Reply #4 - Jan 26^th, 2009 at 4:06pm Nice!!! the egg shaped looks specially great. I've seen the sinkers, but didn't know you could buy the moulds. Thanks a lot
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pedro

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Re: Making moulds
Reply #5 - Feb 4^th, 2009 at 3:11pm

The mold must be hot to get good casts - the first one or two casts will achieve this, just chuck the results back into the melting pot

[/quote]

Take an old clothes iron and clamp it in a vise upside down, right at your casting station. Turn it all the way up. Lay your mold on it as soon as you start melting your lead. This way, you are guaranteed that your mold will be hot from the start, and dry.

P.S. Flux your lead if you want more uniform results.

P.S.S. Don't ever "chuck" anything into the pot! Very splashy bad time!

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Rockman Interfector Viris Spurii Offline Slinging Rocks! Posts: 1267 Lima, Peru Gender:	Re: Making moulds Reply #6 - Feb 8^th, 2009 at 7:09pm Here's a tip for mould making. You can write any message you want using letter noodles. The bag didn't have any G's, so I dressed up a C as a G. There were even Q's, but no G's. Weird.
Back to top	« Last Edit: Feb 8^th, 2009 at 10:34pm by Rockman » glande.jpg (28 KB \| ) Preserving the sling, mankind´s original Magnum. Rookie slingers are modern superheroes: Never far away from trouble. Rockman sling tutorial: http://slinging.org/index.php?page=how-to-make-a-rockman-sling---bruno-tosso IP Logged

slingbadger

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Re: Making moulds
Reply #7 - Feb 8^th, 2009 at 8:04pm

If you can find it soapstone is excellent for molds. It has been used for centuries for that purpose. It is easy to carve with just about anything, and can take temps over 2000 degrees, F.
When you bring the mold together, what you want to do is create small, upward facing channels from the mold are to the edge. the reason for this is when you pour in the molten metal, it displaces the oxygen in the mold. it the air has nowhere to go, it creates bubbles in the metal when it cools.

The greatest of all the accomplishments of 20th cent. science has been the discovery of human ignorance The main difference between genius and stupidity is that genius has it's limits.-Einstein I'm getting psychic as I get older. Or is that psychotic?

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Rockman Interfector Viris Spurii Offline Slinging Rocks! Posts: 1267 Lima, Peru Gender:	Re: Making moulds Reply #8 - Feb 8^th, 2009 at 10:05pm So, this is ok? I put a second opening as a vent.
Back to top	glande2.jpg (40 KB \| ) Preserving the sling, mankind´s original Magnum. Rookie slingers are modern superheroes: Never far away from trouble. Rockman sling tutorial: http://slinging.org/index.php?page=how-to-make-a-rockman-sling---bruno-tosso IP Logged

David Morningstar Slinging.org Moderator Offline Slinging Rocks! Posts: 3419 UK	Re: Making moulds Reply #9 - Feb 9^th, 2009 at 3:57am What's this, then? 'Romanes Eunt Domus'? 'People called Romanes they go the house'?
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slingbadger Interfector Viris Spurii Offline Don't Badger a Badger Posts: 3220 Akron NY Gender:	Re: Making moulds Reply #10 - Feb 9^th, 2009 at 5:28am Rockman, that should be fine.
Back to top	The greatest of all the accomplishments of 20th cent. science has been the discovery of human ignorance The main difference between genius and stupidity is that genius has it's limits.-Einstein I'm getting psychic as I get older. Or is that psychotic? IP Logged

Aussie Past Moderator Offline Joined Nov. 1, 2006 Luke 14:14 Posts: 3265 Melbourne, Australia Gender:	Re: Making moulds Reply #11 - Feb 10^th, 2009 at 7:59am If glandes were inscribed with humorous and insulting jibes like, "ouch" and "for Pompei's backside" I think our pseudo latin slogan is, "Romans go home", a reverse allusion to, "Yankee go home"
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David Morningstar Slinging.org Moderator Offline Slinging Rocks! Posts: 3419 UK	Re: Making moulds Reply #12 - Feb 10^th, 2009 at 11:18am No it doesnt. Whats latin for 'Roman'? Come on!
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Lycurgus Senior Member Offline [ch924][ch927][ch923 ][ch937][ch925] [ch923][ch913][ch914 ][ch917] Posts: 445 Coventry, England Gender:	Re: Making moulds Reply #13 - Feb 10^th, 2009 at 1:41pm David Morningstar wrote on Feb 10^th, 2009 at 11:18am: No it doesnt. Whats latin for 'Roman'? Come on! Romani? Hang on, I will just go get my copy of The Life Of Brian.
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Rockman Interfector Viris Spurii Offline Slinging Rocks! Posts: 1267 Lima, Peru Gender:	Re: Making moulds Reply #14 - Feb 10^th, 2009 at 4:24pm http://www.youtube.com/watch?v=IIAdHEwiAy8 You can watch the scene at this link, they even have a script of the dialog. Life of Brian is a very funny movie. Cheers to the British for coming up with Monty Python.
Back to top	Preserving the sling, mankind´s original Magnum. Rookie slingers are modern superheroes: Never far away from trouble. Rockman sling tutorial: http://slinging.org/index.php?page=how-to-make-a-rockman-sling---bruno-tosso IP Logged

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