Furnace build regarding moly's largely

I work on a floor like that, I used to clip and slide all the time...a little bit of glass dust and away you go.

[Ted Trower]

That's how the floors are finished at the Toledo Museum of Art studios.

[Sky Campbell]

Wow those floors are beautiful! I guess that would be considered terrazzo? I always thought that style floor would have a come back. I can only imagine what that would look like with glass for aggregate instead of stone. Either way very classy looking and easy to clean I'm sure.

[Lawrence Duckworth]

This is polished concrete and in some way I guess the process and equipment are similar to terrazzo but grinding and polishing the buildings ordinary concrete slab is a bunch cheaper than the real deal.. http://www.bluefieldfloors.com/ give ‘em a call

[Virgil Jones]

What temp. do you bring the batch up to? I understood that it got goopy after a certain temperature, Thanks, Virgil

Originally Posted by David Hopman

I preheated all the pellet/cullet charges for 8 years- it's not a big deal to do it. Stainless restaurant steam table pans make nice containers to heat in, and are about $25, so reasonable. One 4" deep pan holds about 40 pounds of pellets, a 6" deep one will hold a lot more.

[David Hopman]

Originally Posted by Virgil Jones

What temp. do you bring the batch up to? I understood that it got goopy after a certain temperature, Thanks, Virgil

950, still rock hard at that temp.

[Virgil Jones]

thanks, david.
i'll give it a try

Originally Posted by David Hopman

950, still rock hard at that temp.

[Pete VanderLaan]

[quote=Virgil Jones;9453

I understood that it got goopy after a certain temperature, Thanks, Virgil[/QUOTE]

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That's called melting Virgil. That's what it's supposed to do.

When doing a pot change... does it matter (for the elements sake) at what rate you cool it down? Can you open the door to speed up the process or could this cause some stress? At what temperature would one say it is safe to open the door and start to disassemble?

[Pete VanderLaan]

I read the super Kanthal handbook and it indicates that the elements are not prone to thermal shock. It is certainly true that you can hot change an element. I don't try to tear things down until I can actually touch the materials without wanting to drop them. I think that would be a good goal when handling the elements or passage bricks. Don't drop them!

So, while there are a myriad of ways to break elements, thermal shocking would not be one of them. Try putting them in a trebuchet and see what that gets you. Shoot for the Nebraska Line.

[Lawrence Duckworth]

This is the start of my 200# furnace build.
Please feel free to jump in with any questions or advice!


Okee-dokeeeee…here's what the 200# stadelman castings look like.

[Pete VanderLaan]

don't forget to flip them over. The pallet goes on top.

Originally Posted by Lawrence Duckworth

Are the heaters and crown so fragile that moving or rolling the furnace with the heaters installed a bad idea? Will that lill bit of vibration break ‘em?


I fear I’ve screwed up before even getting started. I may not have the overall headroom to pull the heaters out from the top unless I roll the furnace out into the open shop....[i have an 8 foot ceiling behind the 7 foot hood aprin.]

Lawrence,
That's a sweet looking hood. What material is that? Can you talk about the construction?

[Lawrence Duckworth]

Originally Posted by Rick Sherbert

Lawrence,
That's a sweet looking hood. What material is that? Can you talk about the construction?

Galvanized slab form decking…do you think that will get hot enough to be a health hazard?

[Lawrence Duckworth]

............44" dia. base

Originally Posted by Lawrence Duckworth

Galvanized slab form decking…do you think that will get hot enough to be a health hazard?

If you're talking about the zinc getting airborne, I don't think so.

I'm starting to build a 300# moly with the castings from Pete. The more details, the better. On your base, what gauge steel for the drum?

[Pete VanderLaan]

If I might, both Charlie and I think the floor on those could use more insulation. Accounting for that need would be a good plan in my mind when planning that steel depth.

[Lawrence Duckworth]

These are actual dimensions taken from the 200# castings.

The center support piece in the tub is a 3x2x1/4 sq.tube w/ 2x2x3/16 angle fitted.
scrap pieces of stretched metal make up the flooring.
The tub is 12”x ¼ x 44”dia.<(200#)
three casters n brackets welded permanently.

As far as insulating the bottom end, I’ll be using a layer of tin foil, 5 layers of 1900 insblock fiber board, one course of 2300 brick layed flat, plus the 4” of casting….

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I’m needing a 50 kva single phase transformer…so far ebay hasn’t worked out so good...can you help?
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[Patrick Casanova]

Look at the Classified Ads... Jim Bowman has everything you need listed for sale. If I was going to go Molly at some point in my future I'd take a serious look at what he has for sale.

[Pete VanderLaan]

I am very sure the Bowman stuff is sold and it was 208 volt three phase anyway. I would look with local demolition contractors in the Atlanta area.

[Lawrence Duckworth]

I really don’t know much more than that I need a single phase 50 kva 4 to 1 step down (whatever the heck that means)…does this look like the ideal transformer for a 200 elbeerer?

[Dennis Hetland]

This appears to be a 4to1/2to1 step down transformer. You're not showing the entire nameplate There's more info on it, like the KVA.
I can't be 1000% positive, but I'm assuming this is rated for 480v on the primary. If you have a 240v service going to your primary and you wire X1 to X3 and X2 to X4 you should get 60v out of your secondary.
The 1 through 6 on the primary are taps for adjusting to high or low voltage coming from your service. Like if you're supposed to have a 480v service, but you're actually getting 500v you can tap it so your secondary is putting out the proper voltage. You could play with those taps to get slightly more or less than 60 volts. If you wanted to for some reason.
You should post another picture that shows the entire nameplate.

[Charles Friedman]

So, I was just wondering what the intended use of this furnace? At this point in construction and placement of this object that is going to be the warehouse of a marketable commodity, I would be thinking about putting a scale under this unit, as well as an adjustable height and leveling mechanism.
Just a thought.

[Pete VanderLaan]

And what you want is sixty volts run with a single bank of five of the elements we'll provide wired in series.

[Lawrence Duckworth]

Originally Posted by Dennis Hetland

This appears to be a 4to1/2to1 step down transformer. You're not showing the entire nameplate There's more info on it, like the KVA.
I can't be 1000% positive, but I'm assuming this is rated for 480v on the primary. If you have a 240v service going to your primary and you wire X1 to X3 and X2 to X4 you should get 60v out of your secondary.
The 1 through 6 on the primary are taps for adjusting to high or low voltage coming from your service. Like if you're supposed to have a 480v service, but you're actually getting 500v you can tap it so your secondary is putting out the proper voltage. You could play with those taps to get slightly more or less than 60 volts. If you wanted to for some reason.
You should post another picture that shows the entire nameplate.

Dennis that’s it for the photos, but is the bottom line a transformer that puts out 60 volt from a 200 amp single phase service? Is this what I ask for at the sales counter?

> this deal has 6 molly tubes, 240 single phase power <