On Friday 15 March 2019 23:01:34 Gene Heskett wrote:

> On Friday 15 March 2019 17:46:43 Bruce Layne wrote:
> > > How about using a radiator like
> > > https://www.amazon.com/Computer-Radiator-Water-Cooling-Cooler/dp/B
> > >07 9D HJ91F/ which is intended to cool CPUs? It comes with
> > > mountings for three 120mm muffin fans.
> >
> > I have a similar radiator for the laser, but the 80W laser produces
> > approximately 800W of waste heat and I wanted to be able to use it
> > all day.
> >
> > I think a radiator is needless expense and complexity for a small
> > spindle motor.  I have the 2.2 KW spindle on the larger CNC router
> > and the coolant starts to become slightly warm after running it
> > constantly for several hours.  Given that the heat transfer rate out
> > of the coolant tank increases as the coolant temperature increases,
> > I doubt I could overheat the coolant system running it nonstop, even
> > with a high temperature ambient environment.  The spindle motor is
> > probably too efficient for that to happen.  If I wanted to run it
> > full time and cooling did become an issue, I'd probably add a second
> > five gallon cat litter bucket cooling tank (free) and another 4
> > gallons of RV antifreeze (US$10).  If space was at a premium, I
> > still wouldn't be tempted to use even the smaller single 120mm fan
> > radiator to avoid adding more series plumbed coolant tanks.  I'd be
> > concerned about leaks and galvanic corrosion and a fan failure.  I'd
> > just get a 50 foot length of tubing and toss the coil on top of the
> > machine enclosure to make a passive radiator.  The thermal
> > conductivity of plastic tubing is lousy, but it's easy and cheap to
> > compensate with a lot of surface area, and I like the simplicity -
> > just a longer piece of the tubing I'd already be using with no
> > welded aluminum radiator, no fan, and nothing to leak or break.
> >
> > I wired my coolant pump into the machine power.  The low power pump
> > runs as long as the machine is powered.  That seemed inherently
> > safer and a lot easier than having the pump under software control.
> The only thing wrong with that, and its a personal choice, is that w/o
> power, the computer is dead also. I prefer to leave the computers on
> full time, and have them, if its feasible, control the rest of the
> machines power.  My Sheldon, when I walk away, has only the pi and
> mesa cards powered up. So if I have work for it, I can log in from
> this comfortable chair, at least write the outline of what I want to
> do the next day. The lathe known as TLM is similar but the machine
> power isn't switched by the computer, I have to go flip the strip
> switch to power it up.  One 40 amp ssr would fix that, I just have to
> find that missing round tuit. I even kill the monitor there, but I
> could let dpms handle that like I do on the pi.  But the pi's monitor
> is fairly new led model, draws 11 watts running, maybe 3 when you
> think its off. TLM's monitor is an old old del 15", a 4x3 with ccfl
> backlight and I don't think it knows about dpms.  At least a decade
> old, I picked it up at a yard sale out in the back country at least a
> decade back, $20 bill at the time. I put a sheet of lexan over the
> front, put it right behind TLM about 10" and the hot chips have about
> destroyed the lexan, but the screen under the lexan is as clear as
> ever.
Got the spindle pump coming on with the spindle. and off 2 minutes after 
the spindle stops.  One less thing to worry about. But it runs so quiet 
I ought to put a tally on it.  Now I'm waiting on parts, again.

Cheers, Gene Heskett
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>

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