On Sun, 03 Aug 2008 15:25:23 -0500, Ignoramus25337
Oh damn, I almost forgot this episode.
Long ago I worked for the CHEAPEST Swamp Yankee on Earth. He had a
machine shop with a gas pump out front. You were supposed to stop in
mid-cut to run out front and pump gas because the gas sales paid the
rent. Every time he did an oil change for someone, we all got new
"cutting fluid". Since it was in a not-too-rich area, the oil was
always long overdue for changing.
The day he handed out oil after an oil change in a Mercededs Diesel
was my last day there. I walked out. My wife had stopped by to bring
me a lunch, looked around, sniffed, and said "QUIT NOW!"
We went though a LOT of cutting fluid because all the end mills were
dull. ALL his machinery, he bought from junk dealers by the pound.
They were RUSTY.
Because he had less than seven employees, he did not have to have a
toilet there. Employees were expected to alk down the street to the
Police station and use theirs. He was also not required to have
Workmens' Comp Insurance. He used to get kids right out of Vocational
School. They'd leave shortly, disillusioned, and he'd just go back and
He got his one year, though, since a town full of bored pissed off
kids decided it would be funny to break in while he was on vacation
shutdown. They took the chucks off the lathes and the kellering
Threading Mill and ran carbide in to spindles and generally wrecked
the place. Not that it was any loss.
The short answer is "Don't be like HIM".
You can get a gallon of soluble oil or synthetic from McMaster, etc
reasonably and it lasts a long time. Don't do this to yourself. Old
motor oil is full of carcinogens and additives and its characertistics
are shot. Even new motor oil or transmission fluid or spindle oil are
not that great for cutting...After all, are they not formulated to
PREVENT metal removal?
For steels and the stainlesses I have had good results with the heavy
duty soluble oils. The Amine based "Synthetic biodegradable" work
VERY well with aluminum and copper, etc.