Hi guys I have uploaded photos of a cement sand mold used to make a cast iron surface plate. No pattern was used, instead strips of timber were clamped...
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Malcolm Parker-Lisberg
mparkerlisberg
Jan 4, 2011 11:44 pm
Ernie Very nice casting, did you carve runners and vent the mould? Malcolm I don't suffer from insanity I enjoy it! ... From: ferrman1001...
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postello@...
dpostellon
Jan 5, 2011 1:27 am
Thanks. I thought I was using too much water. ... Silence is Golden, Duct Tape is Silver. [Non-text portions of this message have been removed]...
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Brian Fairey
bfairey...
Jan 5, 2011 1:49 am
Is it practical to cast aluminium into plaster molds.I know you can get special plasters but I dont need a 50lb bag. The parts are small, model engine size. ...
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Dennis
dennisintexas41
Jan 5, 2011 2:01 am
Yes, but you need to review http://www.gp.com/build/product.aspx?pid=1569 on mixing and drying. The note to see is the one that says that the drying ...
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anson lee
alee1982...
Jan 5, 2011 2:46 am
Regular plaster will work but the detail is not as fine as the expensive stuff Any of it must have the air bubbles removed to get a good cast. ... From: Brian...
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Scott Trostel
blwloco
Jan 5, 2011 3:08 am
Yes, plaster of paris is routinely used for casting work. There are some things you need to know. After making your mold, the plaster needs to be baked at...
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Brian Fairey
bfairey...
Jan 5, 2011 5:47 am
Thanks Scott that was the answer I was looking for Brian....
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postello@...
dpostellon
Jan 5, 2011 12:03 pm
I used 1 part portland cement, 9 parts silica sand, and 3.5 parts water. I was quite crmbly after one day, but after a week, set up like a rock. harder...
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ferrman1001
Jan 6, 2011 12:18 am
Malcolm yes I carved the runners after it had set and I do not use vents as the sand has enough porosity Ernie...
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ferrman1001
Jan 6, 2011 12:33 am
Timing is important but water content can be flexible because excess water can be dried out. It does need a certain amount of water for the cement to set. For...
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David
superdave257
Jan 8, 2011 3:30 pm
Ernie just out of couriosity how big is that surface plate that you poured, it looks to have a pretty large surface area David...
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oldstudentmsgt
Jan 8, 2011 7:58 pm
Ernie, is this kind of mold reusable, or is this like an investment casting, you destroy the mold getting the casting out? Sorry, I'm an amateur with VERY...
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Ron Thompson
ronthomp2002
Jan 8, 2011 9:03 pm
I modified my natural gas burner by adding a larger ball valve and reducing the pipe diameter. I also got it to work very well in my regular casting area, 75...
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ferrman1001
Jan 10, 2011 3:32 am
The surface plate is 10.5" x 10.5" wide and 1.5" deep. Because of the shape with deep cores and amount of shrinkage over 10.5" it would be impossible to extact...
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oldstudentmsgt
Jan 10, 2011 12:22 pm
Thanks, Ernie. That is what I thought, so you've confirmed that it thought this one out corectly, at least! ;) Who knows, one of these days maybe I'll actually...
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ferrman1001
Jan 11, 2011 11:56 pm
I scanned some old 35mm film photos of a furnace that does not use a crucible to melt cast iron. A friend came to my workshop watching how I melted cast iron...
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abascirocco
Jan 12, 2011 1:11 am
VERY COOL! Thanks for sharing, it reminds me a fair bit of the propane fired furnace I use to melt aluminium and I also do the same sort of thing to preheat...
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ferrman1001
Jan 13, 2011 12:10 am
In my rush to write this post I forgot to mention where I posted the photos, they are in the photos section. Ernie...
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Don
don_matthews
Jan 13, 2011 5:19 pm
OK, I have been doing a lot of reading on this and a couple other groups and have decided it was time to jump in the water and make my first post, so here...
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Malcolm Parker-Lisberg
mparkerlisberg
Jan 13, 2011 5:32 pm
Don From <http://www.backyardmetalcasting.com/index.html> Portland cement (1.5 parts), silica sand (2 parts), perlite (1.5 parts) and fireclay (2 parts) This...
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Eric Hess
e_jason72
Jan 13, 2011 5:54 pm
Are you guys calling your parts by volume or by weight? [Non-text portions of this message have been removed]...
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Malcolm Parker-Lisberg
mparkerlisberg
Jan 13, 2011 6:00 pm
Eric Mines dry volume, if it was weight you would be up to your ears in Pearlite. Malcolm I don't suffer from insanity I enjoy it! ... From: Eric Hess...
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Don Matthews
don_matthews
Jan 13, 2011 10:32 pm
Thanks Molcolm! The creator of the recipe I found said that his was one from back in the REAL early days - before the bagged stuff - and was regularly used in...
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STEVEN SQUIER
steven.squie...
Jan 14, 2011 12:45 am
Hello I've read lots of threads and websites, and have learned that a shop vac is a good source for forced air for your furnace. I have read lots of...
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CaptonZap@...
captonzap
Jan 14, 2011 12:45 am
In a message dated 1/13/2011 10:19:29 A.M. Mountain Standard Time, DonMatthews@... writes: 1 - A recipe I have gathered calls for a 3-2-1 mix of sand,...
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Jeshua Lacock
freshjeshua
Jan 14, 2011 1:01 am
... I have seen many furnaces that use air compressors. When I was experimenting with oil burners I dropped oil in the air stream that made a nice mist and...
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hillwizard2@...
hillwizard2
Jan 14, 2011 3:28 am
air compressor are very expensive, also they make small volumes of high pressure air, the furnace need large volumes of low pressure air Mike the...
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Gordon Haag
mr_meker
Jan 14, 2011 4:28 am
If you hook an air compressor up to an Oliver Upwind burner, it will give you lots of low pressure air. ... [Non-text portions of this message have been...
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michael.a.porter@...
mikey98118
Jan 14, 2011 9:23 am
Malcom brought up the fact that fast setting cement is better than Portland cement (actually, some fast setting cement uses Portland cement; you want the kind...
