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Posted by eric on January 22, 2007, 9:04 pm
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I'm going to temper some large 1 1/2" excavator pins and need quenching
oil any ideas?
Thanks Eric
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Posted by Chilla on January 22, 2007, 10:31 pm
Please log in for more thread options I bought the shittiest oil I could buy, nasty stuff that anyone with 1/2
a brain wouldn't use on anything with moving parts. Chock full of
carbon 100% non-synthetic.
The only other suggestion is to go to the local mechanic and get some
sump oil, this stuff is worse than the stuff I bought, but for heat
treating it's the bomb. Just strain it through a piece of cloth before
you use it.
Btw both flame up so be careful.
Regards Charles
eric wrote:
> I'm going to temper some large 1 1/2" excavator pins and need quenching
> oil any ideas?
> Thanks Eric
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Posted by Rusty_iron on January 23, 2007, 7:02 am
Please log in for more thread options Hey guys,
Eric, you can use any oil you can get, be that animal, vegetable or
mineral.
I use old sump oil, as I have lots of it (I change my own oils on
bikes/ute & tractor).
Be warned, used sump oil has some nasties in it, so try not to breath
the fumes. Really that goes for all oils.
you could buy new cheap motor oil if you liked. I have read of people
using automatic transmission fluid, but I don't know how well it works.
I have a friend who uses vegetable oil, the cheapest he could get at
the supermarket.
As to Animal, well I have used whale oil, at the local community
college (called TAFE) which used to teach blacksmithing, they had it
left over from the 50's. Also Wayne Goddard, the knife maker, used a
mixture which contained bacon fat - if I remember correctly, I could
look it up, if you need me too, it was in his book on the $50 knife
shop.
What it comes down to is, use what you have or can afford. Just try
not to use something that is really thick, high viscosity, I'd go
thinner if I were you. I remember reading somewhere that a ligher oil
works better, particularly when you have such thick material to quench.
Please let us know what you use and how it works.
regards
Rusty_iron
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Posted by Charly the Bastard on January 23, 2007, 8:59 am
Please log in for more thread options eric wrote:
> I'm going to temper some large 1 1/2" excavator pins and need quenching
> oil any ideas?
> Thanks Eric
There are several good quench oils on the market. I use vet grade mineral
oil, as it doesn't have all those nasty metallic soaps in it like
automotive petro products. Mineral oil is available at the local feed &
seed, and usually runs about ten bucks a gallon. It's about a 20 weight
oil. The main thing is to have enough volume of oil to suck up the heat of
the part without boiling. You will get a flash fire as you immerse the
part, but it usually goes right out once the part is totally immersed, Wear
gloves, and eye protection from the splatter. Hold the part under until you
stop seeing obvious convective roiling on the surface, then let it cool in
still air.
Charly
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Posted by Ecnerwal on January 23, 2007, 10:09 am
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> oil. The main thing is to have enough volume of oil to suck up the heat of
> the part without boiling. You will get a flash fire as you immerse the
> part, but it usually goes right out once the part is totally immersed, Wear
> gloves, and eye protection from the splatter. Hold the part under until you
> stop seeing obvious convective roiling on the surface, then let it cool in
> still air.
While mentioning basic precautions, aside from adequate volume, try to
make sure that 1: The oil quench container (metal, please) cannot get
knocked over (or at least will require a lot of effort and intent to
knock over). 2: you have a metal lid, preferably a tight lid, that will
fit it. The lid is a fire control device - if, despite whatever, the oil
catches fire and stays lit, drop the part (or pull it out if it's too
long to fit all the way in) and slap on the lid. Lack of oxygen quickly
puts out the fire. It also keeps random crap out of the oil when you are
not using it. Just Say: oil soaked dead mouse is not all that
attractive. Hitting a pocket of water on the bottom of the oil can get
unpleasant. Lid will prevent both.
--
Cats, coffee, chocolate...vices to live by
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