how long should it take for the refractory to dry...i had the furnace and li in the garage for 2 days...i put them out in the sun yesterday and they dont look wet anymore...how long do i have to wait till i can start adding refractory on the sides of the furnace?
--- In gingery_machines@yahoogroups.com, "anthony" <ima_cute_dork@...> wrote:
>
> got some new pics up of the hole i made for the burner tyuere...i think i made it a little to big but i can always weld something up
>
> --- In gingery_machines@yahoogroups.com, "Wonk" <tiwonk@> wrote:
> >
> > Anthony,
> >
> > I hope the photos decieved my eyes as it looks like the (burner) tyuere hole goes in straight rather than tangent to the interior shape? This will cause the flame path directed into the crucible and really should go around. Impingment on the crucible will cause a hot spot and burn a hole into it rather fast! Before the refactory dries you could dig it out and correct this but I hope I am wrong as the rest of the furnaces looks pretty good! Even if your planning on charcoal this will cause trouble so needs to be corrected!
> >
> > Wonk
> >
> > --- In gingery_machines@yahoogroups.com, "anthony" <ima_cute_dork@> wrote:
> > >
> > > nevermind i found add a photo and create album in the photos section...when refractory is mixed what is it supposed to look like? mine is kinda gray ish looking...i've seen some that look white...well i hope i did it right i'll just have to wait and see...
> > >
> > > --- In gingery_machines@yahoogroups.com, Carlos Contreras <maximo64@> wrote:
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Hi,
> > > > Â
> > > > If is green sand recipe that you are looking for, let me tell you that every one have he´s favorite recipe, but all are quite same. and basicly is:
> > > > Â
> > > > Silica Sand
> > > > bentonite
> > > > water..
> > > > Â
> > > > Â
> > > > and for bronze or cooper alloys sea coal is included to improve the surface finisj¡h of the casting..
> > > > Â
> > > > For aluminum the general recipe is.
> > > > Â
> > > > Silica sand 80 -90 AFS grain size distribution
> > > > sodic bentonite 9 to 12% base silic sand (depend how good is your mixer)
> > > > water 3.2 - 3.8%, base on silica sand plus bentonite.
> > > > Â
> > > > here is a link that you can watch to prepare green sand for foundry molds. (sorry it is in spanish).
> > > > Â
> > > > Â http://www.youtube.com/watch?v=8X4VtLcJpn8
> > > > Â
> > > > what does by volume mean?
> > > > those therms are very commun in resin for patternmaker supliers:
> > > > Â
> > > > for example if is a 2 componet mixture and the instructions are: 100 parts of component A and 60 parts of componet B......... and you need 30 LB....then.
> > > > Â
> > > > 160 parts (the total parts)............... .....are 30 LB.
> > > > 100 parts (component A) .................are: "X"
> > > > Â
> > > > "X" = (100 x 30) /160 = 18.75 Lb of component A.
> > > > Â
> > > > Now for component B:
> > > > Â
> > > > 160 parts ------------------ 30 Lb
> > > > 60 parts --------------------- "Y"
> > > > Â
> > > > Y = (60 x 30) / 160 = 11.25 Lb of compnent B
> > > > Â
> > > > So finaly:Â
> > > > Â
> > > > component A 18.75 Lb (100 parts)...
> > > > component B 11.25 Lb (60 parts)..
> > > > Â
> > > > Total             30 Lb  (160 parts)
> > > > Â
> > > > Â
> > > > same procedure if are 3 or for compopnents Â
> > > > Â
> > > > Â
> > > > and can i mix if its been raining all day?, whe its raining the relative humidity increase and all materia that are hogroscopic, catch humidity, but it doesn happend with green sand as it moust cotain betwen 3.2 to 3.8 water...
> > > > Â
> > > > Â
> > > >  i have everything in my toolshed and water doesnt get in but it does get cold in there...ok so if Dave's book says to use silica sand and fireclay thats what i'll use!! is that all u need to make molding sand? just silica sand and fireclay or bentonite? that´s all you need, but My recomentadtion is to use bentonite if it is aviable.
> > > > Â
> > > > all the best.
> > > >
> > > >
> > > >
> > > > --- El sáb 19-feb-11, primepowerpro <randycook@> escribió:
> > > >
> > > >
> > > > De: primepowerpro <randycook@>
> > > > Asunto: [gingery_machines] Re: refractory mix?
> > > > A: gingery_machines@yahoogroups.com
> > > > Fecha: sábado, 19 de febrero de 2011, 22:24
> > > >
> > > >
> > > > Â
> > > >
> > > >
> > > >
> > > > By volume means that you don't weigh out a pound of this and two pounds of that, instead you take a cup of this (or a bucket, or whatever) and two cups of that. The other way (and it is the usual way) is measurement by weight.
> > > >
> > > > So, by example, if I said that I used one part silica sand, one part Perlite and one part refractory clay (measured by volume), and I needed, say, a cubic foot of mix, then I would mix together 1/3 cubic foot of each of those, which is what I did. And it works well for aluminum. Sopposedly, the Perlite improves the heat retention, but I have no standard to measure it against. Hope this helps.
> > > >
> > > > As for making green sand, no, silica sand and bentonite won't stick together worth a damn. You have to add some water.
> > > >
> > > > >
> > > > > what does by volume mean? and can i mix if its been raining all day? i have everything in my toolshed and water doesnt get in but it does get cold in there...ok so if Dave's book says to use silica sand and fireclay thats what i'll use!! is that all u need to make molding sand? just silica sand and fireclay or bentonite?
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > [Non-text portions of this message have been removed]
> > > >
> > >
> >
>
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