On Friday 15 March 2019 15:02:34 Ken Strauss wrote:

> > -----Original Message-----
> > From: Chris Albertson [mailto:albertson.ch...@gmail.com]
> > Sent: Friday, March 15, 2019 1:44 PM
> > To: Enhanced Machine Controller (EMC)
> > Subject: Re: [Emc-users] Spindle motor coolant advice needed
> >
> > When I had a coolant tank, for a different purpose, I put automatic
> > "anti freeze in the water.   It is make just for this purpose and is
> > non-corrosive with materials used in car engines.
> >
> > Also, if the water recirculates it will eventually warm up.  I put a
> > 12 volt fan on the tank lid and made it into an evaporative cooler. 
> >   Then you top off the tank with new water now and then.  If the
> > water is taking even 25 watts of heat from the system it will heat
> > up quite a lot unless you rig some kind of cooling.
> How about using a radiator like
> https://www.amazon.com/Computer-Radiator-Water-Cooling-Cooler/dp/B079D
>HJ91F/ which is intended to cool CPUs? It comes with mountings for
> three 120mm muffin fans.
Thats cute, and the price isn't THAT bad. But its alu, a dissimilar metal 
if that will last about 5 years unless its A: on an insulated mount, and 
B: running a live deionizer to keep the coolant truly non-conductive. I 
have some experience in that dept that yells no at me. I used to monitor 
the resistance of the coolants in klystron transmitters, replacing the 
deionizer cartridge when it got down to 10 megohms, and when I became 
the CE at WDTV and was introduced to the 2x annually replacement of the 
hoses and hose barbs there, which was an all-night and sometimes part of 
the next day job, I said that was it.  And told culligan to fix me up a 
bypass system. Installed it and had the operators start logging the 
waters resistance daily.  Took about 2 weeks to get it up to 5 megs. But 
the last hose barbs were galvanized iron and they were poisoning the 
water, so we collected some brass hose barbs and some new hose and 
changed everything one more time about a year later. The hose barbs were 
eaten away to the point where one just broke away as we were pulling the 
hose. Got it down and refilled, but 30 seconds after we put it on the 
air I was smelling hot rubber hose.  Shut it down and burnt my hand on 
the hose, jerks at the supply house had sold me semiconductive mineing 
hose! They did have the correct insulating hose but we were early 
afternoon  getting it back on the air and had to do it with cistern 
water loaded with organics because it came from the roof runnoff and let 
the deionizer clean it up. That was in 85, and the same hose barbs were 
left installed in about '00 when it was time to fix a hardened with age 
and leaking hose with new hose. Other than some discoloration they were 
still brand new.  About 7 feet of hose to and another 7 from the tube 
socket, but the tube socket had 7150 volts on those hose barbs when it 
was on the air.  After we replaced the iron barbs, it only took about 
one recharge a year of the Culligan cartridge to keep it above 10 
megohms full time. The holding tank held around 150 gallons of water, 
copper tank, blackened with age, it had been sitting there, and still 
is, since around 1957. It work so well that we used that cistern water 
for makeup, probably averaging 2 gallons a day from evaporation. I 
rigged some valves so the makeup went in thru the deionizer cartridge. 
We kept 4 big garbage cans full of water in case we had a leak and had 
to refill it, water bled off the running system so it was in decent 
shape, comparable to distilled.

Yeah both of those transmitters were elderly GE's which if you took care 
of them, would care for your cash cow. And I learned a wee bit about 
water. Good water isn't conductive, its a very good insulator.

Sort of funny, that transmitter was rigged with a pipe nipple and 2 more 
barbs on the hose coming back from the tube socket, located about 6" 
above the grounded return pipe, and it had a 50 milliampere meter to 
ground as a water quality monitor. I replaced the meter with a 50 
microampere meter, and never saw it go above 1 microampere again. Then I 
had the operators log that meter and advise me if it ever went above 1.  
So they didn't have to open the tank to read it with a meter any more.

Something is contaminating this coolant water. No clue if its in the pump 
or the spindle motor. Everything else is plastic, s/b relatively benign.

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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