On Tuesday, February 14, 2012 03:23:53 PM Jon Elson did opine:

> gene heskett wrote:
> >> my trial copy timed out.  http://www.mrmachinist.net/
> >> I just checked, it seems to still have the feed rate, etc.
> >> calculator.
> > 
> > Needs wine & $70.
> 
> Do they have a trial version?
> 
> > Since I have yet to stumble over a suitable pan to catch & recycle the
> > coolant, air seems like the best bet then, delivered via the mister I
> > built, and which I can position about an inch from the tool, following
> > the tool. My run times for that are relatively short as the reservoir
> > only holds about 2 ci.  It also fogs up my glasses as the safflower
> > oil just seems to hang in the air for hours.  It does work well,
> > giving me the best finish ever.  If I open the door & stick a box fan
> > blowing out, the air is tolerable.  40 years ago you could buy a
> > needle valve to regulate the oil flow, but no one makes such a beast
> > today. What you can get is one that when stopped down as tight as you
> > can turn it, still leaks about 10x what you need. :(  Something else
> > I'll have to make I guess.
> 
> While I don't use mist coolant, I think it should be excellent in this
> situation.  I did a similar
> wheel once in some kind of plated steel, and it was chewing up my
> carbide end mill.
> So, I did it with an air blast and brushed-on cutting oil and it worked.
> 
> Have you tried aquarium air valves?

Now there is a source I hadn't thought of, thanks Jon!

> Hoke and Swagelock make valves that
> will close
> down to helium leak checker leak rates, but they may be expensive.

May be?  Shirley you jest. :)
 
> 
> Jon
> 
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Cheers, Gene
-- 
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