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