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  #351  
Old 12-12-2011, 07:27 AM
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Pete VanderLaan Pete VanderLaan is offline
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First loads always go like that Lawrence. It seems like this gaping maw that you just dump 40 tons of material into and it never seems like the level rises either.
Also, glass likes glass. Without some in the pot it distinctly takes longer.
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  #352  
Old 12-20-2011, 08:45 PM
Lawrence Duckworth Lawrence Duckworth is offline
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For what its worth… finished the second 200lb. charge and this time halfway through I called larry @ watlow to see if we could speed up the recovery time. Turns out the scr was set @ 37 amps…turned it up to fifty and the temperature recovered to 2250 in 30/35 min.

The clamp temps range from 85f/140f

The little porcelain bushings are real hot…320+/-

Some spots in the cable are as high as 140f

Temperatures of the furnace sides ranges from 140f/180f

Peeking in the door at 2350 cooking temperature…something like staring into the SUN......
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  #353  
Old 12-20-2011, 11:52 PM
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I just finished the electrical panel for a moly and I oversized all the cables. Drawing 295 amps all night, the cables , all 350 MCM were stone cold.

Fans, think fans. We installed one right on the screen of the transformer and simply put two blowers on the top of the furnace. Charlie did the heat transfer calcs and found it would have less than a 1 percent loss up there.

So, we're one percenters.
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  #354  
Old 03-16-2012, 05:26 PM
Lawrence Duckworth Lawrence Duckworth is offline
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here's a peek at the first piece of glass art out of this furnace. working on the Etsy listing now

Last edited by Lawrence Duckworth; 03-03-2014 at 06:41 AM.
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  #355  
Old 03-16-2012, 06:17 PM
Ben Solwitz Ben Solwitz is offline
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Awesome, everyone loves pumpkin$... see what I did there?

Someone around the bay area told me they made $200k on a pumpkin patch every fall.
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  #356  
Old 08-30-2012, 12:02 AM
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Quote:
Originally Posted by Pete VanderLaan View Post
I just turned Charlie Correll on to lubed fiber, which if you have never used -it is really nice. No dust at all, no water, it's sprayed with lanolin and is really the best when packing fiber.
Pete, why is lanolin better than water and how do I do it?
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  #357  
Old 08-30-2012, 01:23 AM
Hugh Jenkins Hugh Jenkins is offline
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Lanolin is slippery, water is just wet. When you heat up with wet fiber, a lot of moisture is given off. That can exclude the use of some materials like microporous. It can take days for a thick furnace wall to stop dripping. Use the lubed if you can get it.
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  #358  
Old 08-30-2012, 06:47 AM
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Also, the lubed doesn't transfer heat well at all. Water sure does.
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  #359  
Old 09-26-2014, 07:43 AM
Lawrence Duckworth Lawrence Duckworth is offline
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just completed the first pot change on the 200lb moly. I found 3 air tubes partially blocked with debris….(no inlet filter at blower)...something to keep an eye on in the future.

also was able to add 20 sq. ft. of insulation to the top
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  #360  
Old 09-26-2014, 08:09 AM
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The air cooling methodology is pretty flakey. I think that using the copper buss bar for power distribution is better and keeps those things cooler. I am rebuilding mine this fall and expect to find my insulation to be in bad shape as well.
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  #361  
Old 09-26-2014, 01:20 PM
Lawrence Duckworth Lawrence Duckworth is offline
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I’m okay with the air cooling method, its the delivery system that needs a doooo over....the air cooling system could use a bigger blower and at least a 3/4” radiator type hose and a filter.

Here’s the furnace after 3 winters use (and a little clean up). No problems other than Bussman fuses blowing.

Just finished adding a new pot, air ram to open the door and a ceiling blower to help keep the connections cool.
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  #362  
Old 06-14-2015, 05:44 PM
Lawrence Duckworth Lawrence Duckworth is offline
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a link to some of the furnace build photos I have. (scroll down a bit ) http://lawrenceduckworth.com/untitled.html
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  #363  
Old 06-14-2015, 06:33 PM
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Pete VanderLaan Pete VanderLaan is offline
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Thanks Lawrence, I think that really helps. James Burt has bought the 22.5 KW electric package from me and I'm trying to convey how that front plate works. I've advised him to get the plate and then design around it since he wants to bring the 24 inch pot out the front ( What a concept) . Mine, on the 28 inch electric package tilts back a bit on the back of that casting but presents in essentially the same way as yours. That's a great sequence, thank you.

I really will miss my moly.

I'm about to start a medium size gas unit using an 80 lb pot and two 11 inch pots for the time Scott and I will melt enamels if there is an interest.I could use it as a permanent smaller furnace as opposed to the larger one. It will use a recuperation system Charlie Correll is building. I'll do it from the first weld if there is an interest.

Otherwise I'll just build it.
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  #364  
Old 06-15-2015, 09:50 AM
James Burts James Burts is offline
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Lawrence-

Those pictures are terrific! Thanks for posting them.

As Pete mentioned, I'm going to be taking on a build of a moly furnace, and have been having trouble visualizing some of the casting that Pete has been recommending. Seeing your furnace helps considerably!

--James--

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a link to some of the furnace build photos I have. (scroll down a bit ) http://lawrenceduckworth.com/untitled.html
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  #365  
Old 10-26-2015, 09:19 PM
Lawrence Duckworth Lawrence Duckworth is offline
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here's my high tech soft start controller https://www.youtube.com/watch?v=vUyre82myx0 bungee cord
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  #366  
Old 10-31-2015, 02:36 PM
Michael Ahlefeldt-Laurvig Michael Ahlefeldt-Laurvig is online now
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That looks real good- great
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