Search found 128 matches

by todd goff
Thu Dec 23, 2010 7:38 am
Forum: Casting & Foundry Work
Topic: Degassing aluminum
Replies: 45
Views: 15253

Re: Degassing aluminum

I have never used the green sands but believe that the petro bond sands are far superior. Not trying to get off topic here, but I don't think that I have ever vented a casting using petro bond sand (well I did initially and tried it without and got the same end result). I can't remember the rule of ...
by todd goff
Wed Dec 22, 2010 8:06 pm
Forum: Casting & Foundry Work
Topic: Degassing aluminum
Replies: 45
Views: 15253

Re: Degassing aluminum

I am assuming that the flux that I was using was chlorine. It was in a powdered form and was in a plastic bag. The bag had actually disintigrated and the powder went onto a particle board shelf. Well, long story short; it actually ate up the particle board; also, it was very corrosive to the crucibl...
by todd goff
Mon Dec 20, 2010 6:25 pm
Forum: Casting & Foundry Work
Topic: Degassing aluminum
Replies: 45
Views: 15253

Re: Degassing aluminum

I am planning on putting reduced atmoshperes in place. I actually have a dynarad tester and recently bought a rats 401. I am trying to get into casting on a larger scale and figure that when I get the rotary degasser in that having testing equipment and degassing equipment will be a selling point. I...
by todd goff
Sun Dec 19, 2010 6:43 am
Forum: Casting & Foundry Work
Topic: Degassing aluminum
Replies: 45
Views: 15253

Re: Degassing aluminum

I wonder which gas would work. I hear a tale of a 75/25 nitrogen argon that they say works good and I wonder if that's what I should use. I have been told that a 16 crucible should not need degassing. I am fixing to crank up some larger furnaces, putting a steel pot in one, putting the rats unit in ...
by todd goff
Thu Dec 16, 2010 5:39 pm
Forum: Casting & Foundry Work
Topic: Degassing aluminum
Replies: 45
Views: 15253

Re: Degassing aluminum

That was some very good information ghorn. I have basically taught myself how to do foundry work through books and what not. My grandfather taught me some when he was alive (he worked in a foundry for a textile mill mainly doing iron). Casting is something I enjoy; it gives me an escape from the rou...
by todd goff
Mon Dec 13, 2010 7:50 pm
Forum: Casting & Foundry Work
Topic: Degassing aluminum
Replies: 45
Views: 15253

Re: Degassing aluminum

I degas mine with argon; the lance is galvanized steel pipe with the end welded shut and a nipple on the other end. I have small holes drilled in the end for the gas to flow through. I stay away from flux powders as they were eating the silicon carbide pots. I believe in larger spurs as the larger a...
by todd goff
Fri Dec 10, 2010 6:31 pm
Forum: Casting & Foundry Work
Topic: Degassing aluminum
Replies: 45
Views: 15253

Degassing aluminum

I have recently bought a rats unit to test aluminum for hydrogen porosity and am fixing to get a rotary degasser. I realize that this is probably a waste of money but am looking to get into casting on a larger scale and think that this would be a selling point(all about quality control). Is this a w...
by todd goff
Fri Dec 10, 2010 3:49 pm
Forum: Casting & Foundry Work
Topic: Medium high expansion plaster
Replies: 4
Views: 2569

Re: Medium high expansion plaster

It is used in pattermaking to allow for expansion on a casting. Ie; you use the plaster to mold off of the casting and it is somewhat oversize once it hardens.
by todd goff
Fri Dec 10, 2010 7:36 am
Forum: Casting & Foundry Work
Topic: Medium high expansion plaster
Replies: 4
Views: 2569

Re: Medium high expansion plaster

Found it finally, guys. A place in Charlotte will sell you individual bags for 34 bucks a bag. Better than buying a pallet at a time right?
by todd goff
Mon Dec 06, 2010 6:31 pm
Forum: Casting & Foundry Work
Topic: Medium high expansion plaster
Replies: 4
Views: 2569

Medium high expansion plaster

I need a bag of medium high expansion plaster and don't know where to find it. Well actually I did find some but I really don't need 40 bags of it. Does anyone know of a place that would sell me 1 or 2 ? I don't need a whole skid(I mean really who would?)
by todd goff
Sun Dec 05, 2010 8:04 am
Forum: Casting & Foundry Work
Topic: Reclaiming aluminum dross
Replies: 5
Views: 2873

Reclaiming aluminum dross

I have a substantial amount of aluminum dross and am wondering if there is any way possible to reclaim it. Does anyone know how alcoa goes about this or if it is even feasible?
by todd goff
Thu Nov 25, 2010 7:38 pm
Forum: Welding
Topic: l tec 150 question
Replies: 7
Views: 2679

Re: l tec 150 question

I haven't checked this out although the guy I got it from said he had wired it for 220. As usual I can't get one thing done before I have to do 10 other things; I am working tomorrow but I might check it out on Saturday. Don't know where I can get a 50 horse motor from reasonable do you anyone?