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I got 2kg bottle of 99.9% powdered sodium silicate off Ebay from Korea

I havent done it , but Drain'o' / silica gel / water , makes a poor mans water glass ( dip news paper in it , wrap around...

i was eyeing off my 1/2 roll of 25mm ,and think a couple of cow skins and a sowing machine will make a nice full length heat/fire proof apron , i even have some aluminized fiberglass sheet ( fake...

forgot to say some thing about " zinc fumes " there nasty , not too bad at aluminum temps , but at copper temps , zinc will fume as a white smoke , dont breath it in , it will mess with you , they...

pure zinc shrinks a lot
7000 series alloys are zinc based , i was making some end caps for a home made Air Ram and added 8%zinc and 4% copper to extruded ( 99.9%) aluminum , dam its hard , and...

die cast " carbie parts " would be zink with any thing from 8% too 25% aluminum
die cast is easy to see , the marks from the die , look the same as plastic die marks , cast aluminum wont have die...

my furnace has 18mm hard hot face , with 50mm of kiowool behind it

lol , my furnace is finished , and runs well , the burner was fine for aluminum , but i also made a waste motor oil / jumping castle fan burner that is good for copper

those small PC fans were...

the flame will change inside a furnace , as now it can get extra air if its running rich , in a furnace , it relys on the fan as its in a closed environment ,

can you find a length of pipe ?? 2m...

depends on what sized crucible you want to use

if it can keep up the air for a nice smoke free burn , burning a gallon an hour , it will melt copper alloys in a #10 crucible >2lt ,in a 1/2 decent...

ROTFL , sorry in a stupid mood today

i have no idea where to get it in adeliade , the closest i found to Darwin was

"Shiracast 160AR" about $66 a bag from "the fire brick company " , its good...

mine came in a bag ," 1600c castable refactory " and i added water

thats all a home made refatory would take , with top quallity materials that would be harder to find than a 1600c castable refactory ($60 a bag ) and then still not as good ,
for auminium a home...

i was trying to show how easily things can go wrong
i drew that up in CAD in hope it works better than me typing "ware face shield , glasses , gloves , apron , chaps , and boots " and newbies...

you cant pick up a clay graphite crucible with a pair of pliers , when hot there quite soft , and you and squash them easily , you will have to make or bye a set of " lifting tongs " , and a "...

i got my A#10 graphite clay crucible's off ebay for $60 each + postage , the postage is huge for 1 but they bundle mutable purchases
a A10 holds 10pounds of aluminium ( 4.5kg) or about 2lt

my...

beads , bricks , coal ,. it dosnt matter , all within 10% heat out put ,
They will burn where the air is , and insulate where there is no air , if the air comes in from the side , you will get a...

heat the bricks slowly as any moisture might cause the bricks to explode , a hand full of brickets for 2 hours with out forced air

heat loss should be ok , just add more fuel more air

the air...

steel crucible is not recommended for copper as the copper will alloy and desolve the steel , Stainless steel is worse than steel ,for a 1 off pour steel 6mm thick will work , SSpan wont , BBQ beads...

a good soot layer will help ,.
with propane or WMO you can run your flame " sooty " that means there is bugger all oxygen in the furnace to destroy your tin can crucible
with coal ive seen...

sounds like good green sand coming up

bentonite clay 10%
sharp fine sand 85%

there are several mixes, some say add fine iron oxide , some say add fine coal dust

i dont use "green sand "...

before you mix your sand , test some
copper at 1100c will over heat some sands , causing them to foam up and turn to crap
silica sand will turn too glass , and fully melt at 1600c

quartz is...

another form of "sand " is bonded sand
sodium silicate , is mixed with water and sand , rammed into shape , then hardened with the use of co2 , then oven dried

mainly used as a "core " material...

casting sand / green sand is easy enough to make

i use pertrobond , mix 20:1 with sharp super fine high purity silica sand , then add oil

with green sand , solid plasterers sand ( sharp sand...

there is a QLD supplier
but i found a USA , 7kg petrobond clay seller at 1/4 of the price , using better local 99% silica sand , 100um sharp sand local 2 stroke marine outboard 2 stroke oil ...

if you do start too use that forum , they will expect you to have read this Foundry Tutorial Book

just so you dont ask the same questions that were asked every 2 days before ^^^that page was...

Burner engineering

why propane ? its always hard to use up a bottle , and if you pull too much gas out too fast , they freeze over ?

Diesel burner
is my diesel burner , its good for aluminium...

another page on "inclusion reduction " http://www.komatsu.com/CompanyInfo/profile/report/pdf/158-04_E.pdf

the last few days ive been reading these papers , well worth it , if your looking for info on Aluminium alloys ,
lol over 3000 pages of good well writon info
Talat - Home page

there is not much too it , a hole in the ground , a 2 inch pipe to the bottom , a hair dryer for " forced air " , and a bag of BBQ beads , steel sheet with a hole in it as a lid and melt aluminium...

i live in the rural area to the south of Darwin where Australia Post rips me off with postage , because its zoned as Outback

ive just been reading up on how to make aluminium foam

lol just need to mix in lots of hydrogen into the melt
and it seams the easiest way is with calcium carbonate mixed in
from what ive...

been watching this , and have been left with out words ,


FRIGGIN WOW

i had to say something , as a newbie to casting , thank you for posting
cheers ken

at 999 posts where do i post my...

no it was polyurethane foam , not Styrofoam
i haven't tried to mill Styrofoam yet , but will try , for lost foam casting the styrofoam is suppose to burn out quite clean when you pour the molten...

i found a block ,a housing trust tenant left it behind when they moved out , i grabbed it quick smart ( was changing the locks )
yer factory made , it was 1200mmx900x200 , probably would have made...

got the burner running tonight with the fans speed controller , it works well

so i propped up the furnace , and fired it up to complete the burn out ,i lit it upside down first and shut it off ...

im just starting out , and are still looking for "decent sand " , i got some (7kg) pertro bond 2 binder sent out from usa from http://shop.petrobondforsale.com/Mul...on=alloyavenue , it should make...

the Foundry was only set up 2 weeks ago , i started this thread in the CNC section and got moved

,
will be working on the burner today , i have a larger "jet " fitted now ,. and am working on...

no coke just the coal , what sort of coke ? cokeacola =0 the 3rd ones way too expensive to use unless your smelting at a rave

ive heard a lot of bad things about "waste oil " , the sludge in...

ive started on the foam mold for the furnaces body

i put the glue a bit too close to the edge on the first 2 layers i glued together , there is still a round peace to go on the " top " (bottom )...

so you guys seam to think waste oil is hotter than diesel ? , i pulled this off a different site


Natural Gas.....1,030 BTU/cu ft
Propane.........2,500 BTU/cu ft
vegetable oil 120,000...

was about to spit the dummy about being moved , so before i did i looked where i was moved too ,
:2tsup: cool :2tsup: a new forum page just for me , i wont be complaining
i guess now im not in the...

managed to get a few good hours out in the shed tonight

i knocked up a HDPE , round to square converter , yer HDPE aint the best but i had some , looks like ive found something to cast in...

did a bit more on it today , i went back to the oil instead of the mist sprayer for cooling the bit ?/ quicker to set up on a 10min cut , and my compressors in my van , and it was raining , and i...

nar employ a suicidal bloke to do it for you ? i don't want to get within 3 foot of 2.5lt of molten iron , it will give you at tan at 10feet

im building this to withstand iron temps , but brass...

Disclaimer > do not try this at home , or atleast say " WATCH THIS " to a mate before hand , so he can upload your error in judgment too Utube , so the HOLE WORLD can laugh at you , ( just remember...

ebay listing pick up only
$50 for a home made furnace ??? looks like its worth $50 :2tsup:

metal smelting furnace | eBay

at the time of this post , i was getting a heap of

"The server is too busy at the moment. Please try again later.'

message screens

yes i know , me adding this dosnt help , looked at the...

was going to search the forum , and got stuck in the "random question" merry go round , answer it properly and have to answer another question " isnt the answer to " what country dose the kangeroo...

don't know if you have access to a vacuum furnace but the ring pulls on cans are made from titanium ,there worth more as scrap than the can is