[TheForge] Strengthening castable refractory

Wed Aug 27 22:45:01 2003

How about this? take a spool of mig wire cut through the whole thing w/ an
abrasive wheel in one spot, carfully lift the whole mess off the spool and
wrap w/  electrical tape soas to hold it all together. Now stick it in the
chop saw and start cutting needles.
Randy Mundt
----- Original Message -----
From: "Bruce Freeman" <[email protected]>
To: <[email protected]>
Sent: Wednesday, August 27, 2003 11:18 AM
Subject: Re: [TheForge] Strengthening castable refractory


> Depends what they're to be cut from, and how long the have to be.  Some
> SS is fairly soft and easy to shear.  Put a large number of pieces of
> this across a shear and you might could cut large numbers in little
> time.  Then again, if getting the right wire and cutting it is more work
> than the money, you just buy the stuff.
>
>
> >>> [email protected] 08/27/03 12:28PM >>>
> I am not sure that I could cut that many needles in the amount of time
> that $9 would buy.
>
> Mike Graf
>
> Bruce Freeman wrote:
>
> > What exactly ARE these  SS needles?  Short pieces of wire?  How
> 'bout
> > just cutting up some SS wire, instead of paying $9/lb forSS?
> >
> > Bruce
> > NJ
> >
> > >>> [email protected] 08/26/03 09:14PM >>>
> > I received some technical info from Mt. Savage on the Delta t Crete
> 25
> > insulating castable I'm about to use. In case anyone's interested
> here
> > are a couple of the specs:
> > Density after drying:   54 lbs/ cu.ft.
> > Max service temp:       2500 degF
> > Therm conductivity:     1.4 BTU/Sq.Ft./Hr/degF/in. at 500 degF
> >                         1.9 at 1500 degF
> >                         2.3 at 2000 degF.
> > Water for casting:      Approx. 55% by weight
> >
> > Now a question. The best way to prevent checking is to use the
> minimal
> > amount of water. They give an approximate amount, 55%, but how do I
> > tell
> > when it's enough? From what I've read on other mixes, it should be
> > just
> > enough to hold it together when clumping it in your hand. Does that
> > sound right?
> >
> > My local refractory place has SS needles for $18 / 2 lb bag. Sounds
> a
> > little expensive, but not too expensive.
> >
> > Hopefully I'll get to casting this weekend. The shell is just about
> > done.
> >
> > --
> > Marc Godbout
> > http://www.ironringforge.com
> >
> > New England Blacksmiths Membership Director
> > http://www.newenglandblacksmiths.org
> >
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