It sounds to me like a car radiator from a junked car would make a perfect cooling tank and heat radiator.
Ken On Wed, May 23, 2018 at 8:01 AM, Dave Cole <linuxcncro...@gmail.com> wrote: > RV antifreeze works well for things like this. I have been using it for > years in my bandsaw coolant tank. It doesn't seem to go bad even after > years and it doesn't evaporate much. > > For cooling, You might want to consider making a flat tank. Two sheets of > steel or alum spaced apart an inch or so and welded at the edges. That > would increase your surface area for cooling while not creating a huge tank > volume wise. Put the tank on edge and it won't take up much space. > > > On 5/22/2018 5:34 PM, Bruce Layne wrote: > >> I've had two of the Chinese 2.2 KW water cooled spindles for the last few >> years and have had no trouble with them. I consider them to be a good >> value. Well worth the plumbing hassle, in my opinion. >> >> Be sure to use good quality very flexible tubing of the correct size. I >> think I got 8mm outside diameter tubing from McMaster-Carr (red for supply >> and blue for return). I use pink RV antifreeze as the coolant. It's used >> full strength and not diluted. I use it in the hope that it's less >> corrosive than water. Neither machine's coolant has had any rust or other >> issues, although there was a slight film of oil that's flushed out of the >> spindle motor. I'm not worried about it freezing because one of the CNC >> routers is in an attached garage and the other is in my basement, and >> neither get very cold. I'd actually be more worried about the machine >> rusting if it was in a condensing environment, and the CNC routers are >> mostly aluminum. >> >> I mounted a thin liquid crystal thermometer on the spindle facing the >> operator so I can tell at a glance if the spindle overheats. These liquid >> crystal strip thermometers are readily available on eBay and are sold for >> reptile terrariums. I buy a bunch of them and put them in electrical >> panels, etc. >> >> I haven't finished wiring it yet, but the production machine will have a >> 130F bimetallic button thermal switch siliconed to the spindle motor >> housing and wired into the e-stop circuit to shut everything down if the >> spindle overheats. >> >> The Huanyang VFD produces a lot of electrical noise, apparently mostly >> radiated. I used ultra flexible shielded four conductor cable (three >> phases plus ground) to keep the cable from radiating much energy. The only >> place I had an RFI problem was the VGA monitor and a good quality VGA cable >> fixed that problem. >> >> On the larger router, I tried to place a five gallon coolant tank under >> the router and pump the coolant up and then back down to the spindle >> motor. I was partly motivated by not wanting a leak that siphoned the five >> gallon coolant tank empty. After some experimentation, I gave up and put >> the coolant tank on top of the CNC router enclosure. When it was >> underneath, I needed to use such a large pump to have enough pressure to >> pump the coolant six feet vertically that the submerged coolant pump was >> heating the coolant more than the spindle. It was a spindle heater, not a >> spindle cooler. >> >> We're finally ramping up production, with some programs running >> unattended for ten hours. I'm going to need to add a radiator in the >> coolant return line and a couple of muffin fans to keep the coolant >> temperature low enough. The other alternative might be ten or fifteen more >> gallons of coolant to increase the thermal mass, but that seems to only >> delay the overheating problem with greater risk of a severe coolant leak. >> >> >> >> >> >> >> On 05/22/2018 03:18 PM, Roland Jollivet wrote: >> >>> I'm looking at getting one of those 2.2kW air or water cooled spindles + >>> VFD kits out there for a router. >>> I'm not worried about the noise difference between the two types. >>> >>> Has anyone taken apart a water cooled spindle? >>> How are they doing the cooling? Is it a water jacket or just some copper >>> tubing inside? >>> How likely is it to leak in a few months time? >>> I can only find one video describing leaks and water related shorts etc. >>> (so they must be good?) >>> >>> I actually prefer the idea of using air-cooled and making ducting to take >>> the exhaust away from the spindle nose. Make a closed loop fan-assisted >>> air >>> duct. >>> The irony is that I want to use flood cooling on the work. (composite >>> material) So it won't be a dry environment. >>> >>> Regards >>> Roland >>> ------------------------------------------------------------------------------ >>> >>> Check out the vibrant tech community on one of the world's most >>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >>> >>> >>> >> >> ------------------------------------------------------------------------------ >> >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > ------------------------------------------------------------ > ------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
