Dan, You would be wise to make the refractory more insulative by making two layers. Go to Home Depot or garden shop and buy a small bag of perlite ( like used in garden soil) add about an inch or more of a mixture of the perlite and refractory, about 75% refactory to 25% perlite. Thjat will give the outer layer better insulation and also make the furnace a bit lighter in weight. after the outer layer is somewhat set then complete the rest of the refractory. Remember to make the teyere at a tanget so the flames swirl. Holler if you need advice!
cheers Wonk
--- In gingery_machines@yahoogroups.com, "jackthimble" <jackthimble@...> wrote:
>
>
> Clane,
>
> I am planning on building a modified version of the gingery gas fired furnace. I cut up a 30 gallon oil drum (14" OD) into three sections and going to use the 8" cylindrical concrete form that Rex mentioned for the ID. (Purchased at home depot for about $8) I'm using a commercial refractory since there's a supplier nearby and ignoring extra insulation at this point. Also designing around the 1/4" mike porter burner. This is after following Rex's advice :)
>
> -Dan in Portland, OR
>
> --- In gingery_machines@yahoogroups.com, Clane <gear@> wrote:
> >
> > It's worth a try :)
> >
> > Clane Kaluna
> > Honolulu, Hawaii
> >
> > On 10/26/2010 11:08 AM, Matthew Tinker wrote:
> > >
> > > Clane,
> > >
> > > you have volcanic rock in hawaii, this same rock is used for Kiln
> > > "furniture" in ceramics. It will if I remember correctly resists up to
> > > 800°C, so you could actualy build your furnace right ino the beach! As
> > > an alternative you could, if you have a source of clay fire bricks
> > > using a mixture of clay and volcanic dust. The dust is inert as it is
> <<SNIP>>
>
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