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 Post subject: Furnace for Metal Casting
PostPosted: Sat Sep 04, 2010 8:26 am 
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Joined: Wed Sep 01, 2010 4:42 pm
Posts: 8
Hey Everyone,

I'd like to try my hand at metal casting. I've looked at a few designs for making a small furnace, and I'd be willing to make one for HF. I was thinking of something on this scale that could be wheeled outside:

http://www.backyardmetalcasting.com/hmkit.html

Give me some feedback on this proposal, and let me know if you have experience or want to help.

Kory


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 Post subject: Re: Furnace for Metal Casting
PostPosted: Sat Sep 04, 2010 9:08 am 
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Joined: Sun Jul 26, 2009 4:27 pm
Posts: 28
i chronicled my misadventures with aluminum casting in this thread.

viewtopic.php?p=4681#p4681

made a cheap charcoal foundry set up. i used a couple of tins mounted together. got a steel milk pitcher from ikea for the crucible.

i've been trying to dream up something cool to cast.

love to build a gingery lathe but its alot of effort.


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 Post subject: Re: Furnace for Metal Casting
PostPosted: Sat Sep 04, 2010 1:32 pm 
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Joined: Wed Sep 01, 2010 4:42 pm
Posts: 8
Bobble,

Thanks for sharing your adventures. The gingery lathe was the first thing I thought of too, but common sense intervened. Have to get the sketch pad out I guess.


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 Post subject: Re: Furnace for Metal Casting
PostPosted: Sat Sep 04, 2010 2:45 pm 
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Kory wrote:
Bobble,

Thanks for sharing your adventures. The gingery lathe was the first thing I thought of too, but common sense intervened. Have to get the sketch pad out I guess.


kory, what are you going to cast?

anyone have any cool casting ideas?


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 Post subject: Re: Furnace for Metal Casting
PostPosted: Mon Sep 06, 2010 12:00 pm 
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Joined: Wed Sep 01, 2010 4:42 pm
Posts: 8
I was thinking of making some small abstract sculptures or figurines, I'm still sketching out some ideas.


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 Post subject: Re: Furnace for Metal Casting
PostPosted: Mon Sep 13, 2010 11:20 am 
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Joined: Tue Apr 06, 2010 10:12 pm
Posts: 750
Per our conversation on clean-up day. If this type of AL scrap is useful to melt I'll bring it in. It's shavings / dust / small pieces of 6061 from plate I'm routing to make upgrade parts for my CNC.

Pete

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 Post subject: Re: Furnace for Metal Casting
PostPosted: Mon Sep 13, 2010 12:07 pm 
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Joined: Wed Sep 01, 2010 4:42 pm
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Pete,

From what I have read, chips can be melted down for casting provided they are added to a decent pool of molten metal. Also might help to compact them in a can. Otherwise they tend to oxidize. I'd be happy to give it a shot. Thanks!

Kory


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 Post subject: Re: Furnace for Metal Casting
PostPosted: Thu Oct 07, 2010 8:01 pm 
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Joined: Fri Mar 19, 2010 11:14 am
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Location: downtown Saint Paul
I would also be very interested in a furnace for metal casting. The backyard.. site you mention above has lots of good stuff on it.

I've dabbled a little bit with casting with zinc from pennies in a small charcoal fueled furnace I made. It was wicked fun.

It looks like building something on a dolly is a pretty good way to go. This gives you a sturdy framework to mount stuff to, and a nice big pair of wheels to play with.

Most of the designs I've seen involve using either a 5 gallon metal bucket, such as some adhesives or flooring goop come in, or instead a propane tank.

If someone else doesn't make one of these, I'm going to, and hope I can keep it at the space.

Metal casting works really slick if you have a cnc that can work on pink foam. It eliminates the need to make wooden patterns for one off castings. Simply shape your positive out of pink foam, glue on a plank of foam to act as a "sprue", submerge the pattern in a bucket of sand, apply melted metal, and bang! there's your part.

If anyone does start moving forward on this, let me know, so we don't needlessly duplicate effort.

Riley Harrison

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 Post subject: Re: Furnace for Metal Casting
PostPosted: Thu Oct 07, 2010 8:57 pm 
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Someone at the HF has a small charcoal furnace and crucible already. I drop some scrap 6061 AL off near Kory's bike trailer project, along with a bag of shavings the other day.

Be happy to cut a foam "positive" pattern for anyone who wants to try it out.

Pete


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 Post subject: Re: Furnace for Metal Casting
PostPosted: Thu Oct 07, 2010 10:50 pm 
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Joined: Fri Jan 30, 2009 1:54 am
Posts: 194
Location: Coon Rapids
My charcoal fired furnace is at the shop. It's the festive holiday popcorn tin on the floor, in the corner, by the shelves on the north wall. There's a 12v blower and a 120v blower with it.

Here's my original blog about it: http://www.visi.com/~darus/foundry2/

Its based loosely on the Gingery style, but slightly smaller (Metal 5 gallon buckets are hard to find) and with a different refractory lining.

I think there's a small collection of hard drive chassis and other misc. aluminum bits around there, too.

I'd be happy to get together and fire it up one of these days.


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