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> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
