[TheForge] A different needle question

[Jerry Frost]

PCBs Mmmmmmm. The best heat treat oils I've ever used are Heat treat oil and
heat transfer oils though DN 600 worked very well. The heat treat and
transfer oils are designed for carrying heat away from the source to the
sink, both have very high flash points low emissions and are generally very
low toxicity.

A lot of us grew up during times when toxicity of "ordinary" products wasn't
a big concern to any of us. We used to work in Dad's shop wreathed in smoke
from the spin lube we mixed ourselves and ord knows what else we exposed
ourselves to spinning exotic metals. Seeriously, who knows what "Mu metal"
is made of? What we knew about a lot of the stuff was it was classified,
don't ask about it, don't talk about it, don't admit you know anything about
it. Some of the stuff required special lubricants because we were spinning
it incandescent yellow heat so our normal "Phels Naptha" soap and white
grease lube we mixed ourselves wouldn't do.


Dad died of complications from COPD after a lifetime of being exposed to who
knows how bad, stuff. He did tell me his shop had MUCH better air than the
spin shops at Boeing had during WWII and after. That the guys folk our age
think of as old timers used products we now consider illegally dangerous is
no surprise, we even as a society live and learn. 

Frosty
-----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net] On Behalf Of Peter Fels & Phoebe
Palmer
Sent: Friday, October 25, 2013 6:52 PM
To: Blacksmithing List Sponsored by ABANA
Subject: Re: [TheForge] A different needle question

PCB transformer had a really high flash point. The old blacksmith Pete
Paulson pointed that out to me long ago.
He's long since dead and i have his anvil now. The PCB oil was very
effective quench oil and i used it for years thereafter. It was thought to
be pretty much inert back then.
Mmmmm...Wrong!

On Oct 25, 2013, at 7:14 PM, Rob Fertner wrote:

The museum shop had a lidded container filled with motor oil, 30W I think.
This has a lower flash point than vegetable oil.

-----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net] On Behalf Of Peter Fels & Phoebe
Palmer
Sent: Friday, October 25, 2013 3:06 PM
To: Blacksmithing List Sponsored by ABANA
Subject: Re: [TheForge] A different needle question

Needless to say, different oils have different flash points, but close
enough for most applications.


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