Thread: Aluminium Grades
For flood coolant what about using a pond fountain pump like this one -
I bought one for leak testing a job we did for the m.o.d., just threw it in a bucket of water and left it pumping water onto a bearing for 2 days. Worked a treat! Plugged a hose pipe onto the top were the fountain attachment usually goes.
They have a flow adjustment built in as well.
Michael - I have one in my garage if you want to give it a go.
Diesel injection pump isn't really suitable, the clearances inside required to get up to 115 bar to 280 bar - 1700 psi to 4,000 psi means the slightest lack of lubrication or grit and it's toast.
Going slightly off topic but whilst looking up these pressures which I had forgotten [ past life ] I found out that the latest diesel with high pressure common rail systems use pressures up to 2,000 Bar or 29,400 psi.
Home made water jet anyone ?John S -
Im told that the Al from pistons is nice to work, melts nicely for casting into ingots and machines cleanly. Another reason to visit Looms?
Havent used pistons myself but I have used hard disc chassis; nice light alloy that melts easily (dont know temps - got no thermocouple).
Used the melt to cast a replacement key cos the buggers* wanted £8.50 for what seems to be a bog-standard mortice key.
Theres someone with a website about casting etc who uses HDD Al regularly with good results, I'll try and dig out his URL.
Does anyone in the Derby/Notts area know a good source of fire bricks?
I only need a dozen or less for a small electric Al melting project, I dont need a pallet full! Preferably the ones you can cut with a wood saw.
*I tried 3 different keycutters, one had a nice engraver that looked PC driven. He wouldnt let me play after Id sniffed at his prices.:heehee:
How easy is it to cast alui. did it years ago at college but always ended up looking like an aero lol bubbles bubbles......
Do you need main gas? definatly interested in getting in to it.
Sorry to be off topic again
I'd suspect your aero would have been caused by too wet a sand/clay mix (clay bonded brown sand?) if using petrobond you get none of that.
I'll be building 2 new furnaces this year, one for cast iron and another tilting furnace for Al.
I'll take some pictures and might break a habit and write about it :)
As for off topic....it's about Al so it's on topic [/quote]
:clap:Yeah it was a brown sand and i seem to remember it had to be preety wet to retain the shape, Cheers! the poor finish has always put my off doing it again, but like you said the posibilites and time saved in milling from billet would be well worth the effort.
Look forward to the pics and demo.
Are alloy wheels a good supply for melting down?
I feel a need to share some of my experiences with cast aluminium, this will be only personal views, not aimed at anyone or trying to spoil anyones fun in trying to make your own as I am all for having a go at something and f@&king it up and trying again as sometimes this is the best way to learn!
Cast aluminium will always be full of aero holes, I once tried to water cool a vacuum forming tool that was made out of 20 chocolate box female aluminium castings which were cast by a foundry that specialized in aluminium. After 40 hours of drilling 1mm holes and then linking all the holes by back drilling the castings then free hand milling all the tracks to link the holes and then mounting them on a nice solid 1" aly plate found out that after I had water tested it that I had made myslef a very expensive and very large water sprinkler!
Threw it straight in the scrap bin and started again, tried it a couple of times again with different grades and methods of cast aly with same results. In the end I gave up and watercooled the 1" extruded aly back plate by drilling and plugging, never bothered with water cooling the castings again.
Personally I don't think you can cast ally without aero bubbles, I may be wrong but would take a lot of convincing!
By the way just bought some T6 aly plate today - £39.70 for a piece of 550x300x20mm. I have not had the fun of making it but can have more fun machining it and for £40 I know what I would rather be doing.....
Still interested to see your results though.
Ali, ally, al who gives a f$ck, what do you expect after drinking a bottle and a half of wine.
Good point about the cylinder head though, never thought of that one before....
Last edited by HiltonSteve; 05-06-2009 at 08:40 PM.
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