Re: Used motor oil as cutting fluid


"Ignoramus14891" <ignoramus14891@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:o5idnefMCNMaVAbVnZ2dnUVZ_sWdnZ2d@xxxxxxxxxxxxxxx
On 2008-08-08, Ed Huntress <huntres23@xxxxxxxxxxxxx> wrote:

"F. George McDuffee" <gmcduffee@xxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:048n94hnijm0rrvp19tund4a6vnls0tv4s@xxxxxxxxxx
On Thu, 07 Aug 2008 21:26:04 -0400, GeoLane at PTD dot NET
<GeoLane at PTD dot NET> wrote:

On Sun, 03 Aug 2008 15:25:23 -0500, Ignoramus25337
<ignoramus25337@xxxxxxxxxxxxxxxxxxxx> wrote:

Has anyone tried it? Perhaps after filtering it?

Many years ago in the infancy of "The Home Shop Machinist" there was a
recipe for soluble oil. I don't remember the proportions, but
essentially you made up a fairly concentrated detergent solution and
slowly added the oil to it. The other way around didn't work. If you
added the detergent to the oil it wouldn't mix. I tried it and it
worked OK. Easier to just buy the stuff today.
<snip>
RWL
================
Try using water pump lube from the autmotive section. Works for
me.

Or try something really novel -- a fluid that's made for the job. <g> A
gallon of Trim Sol or similar water-miscible oil will cost around $20 -
$25,
and it will last you a very long time. For most machines that have a
sump,
you mix it somewhere around 10:1 with water.

If you use a good grade of cutting fluid (Trim Sol is well-tested in
industry), you'll save enough on cutting tools to pay for it in no time.
I
had a quart of Trim Sol and it lasted me three or four years. And I did a
heck of a lot more machining in those days. I mixed it 5:1 for use on my
South Bend.


Is that the kind of fluid that looks like fat free milk?

After it's mixed with water, yes, it's milky. That's your basic "water
soluble" (actually, miscible), oil-based coolant, which has been around for
more than 50 years. Some of the newer synthetics don't get milky -- and they
really are water soluble, rather than miscible.

For the small shop, the basic miscible coolants are all you'll need. The
fancier stuff can pay off at high speeds with multi-coated tools, but we're
not likely to see their benefits in non-production applications.

Again, though, all of these water-diluted fluids should be thought of as
coolants, not as cutting lubricants. Miscible oils are not as good at
lubricating as the lard-oil and mineral-oil-based cutting oils. But they're
close. Mixed 5:1, they're lousy coolants but better lubricants. That 5:1
mixture for my South Bend was recommended to me by the engineers at Master
Chemical, who make Trim Sol. If you apply your cutting lubricant with a
brush or with a drip, you're really after lubrication rather than cooling.
If you need cooling, you need a mist or a jet. That's when you use the
regular dilutions.

--
Ed Huntress


.

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