On Friday, November 04, 2011 11:39:28 PM Dave did opine: > On 11/4/2011 9:17 PM, Dave wrote: > > On 11/4/2011 2:17 PM, Dave wrote: > >> On 11/4/2011 12:40 PM, gene heskett wrote: > >>> On Friday, November 04, 2011 01:26:34 PM Viesturs Lؤپcis did opine: > >>>> Hello, gentlemen! > >>>> > >>>> I am in trouble with that double-spindle wood milling machine. > >>>> It has a tendency to freeze up. > >>>> > >>>> I have been trying to understand, what is wrong, but the symptoms > >>>> are telling that the problem is in the small wood dust, that gets > >>>> inside PC case and everywhere else, because the more machine is > >>>> working, the more errors it produce - let rest for few hours and > >>>> it is back on track. > >>>> > >>>> My proposed solution - put PC and monitor in a totally closed, > >>>> dust-proof case. > >>> > >>> My solution to that is to put the machine and motor driver > >>> electronics on a > >>> shelf about level with the counter spring pulley, with a lexan > >>> shield between the machine and the electrics. No attempt has been > >>> made to seal > >>> the computer case at all. > >>> > >>> I have cut a lot of wood with it, and have not had the machine > >>> collect enough dust to cause any problems. > >>> > >>> For my latest motor driver kit, the housing is built with pretty > >>> tight joints, with a 360 watt psu, a 6" ball bearing 120 volt > >>> rotron fan and 4 of > >>> the MM-542 drivers in it. The fan is to distribute the heat to the > >>> housing, which is either 1/8 or 3/16 alu plate. It gets pretty warm > >>> after > >>> a couple of hours, so another 6" rotron is sitting on edge on top of > >>> the > >>> enclosure blowing air across the top, and 4 hours later the front of > >>> the > >>> box is maybe 110F when its 70F in the shop. I'll do better at > >>> directing > >>> its air flow when the heat hits next summer. ;) > >>> > >>>> But then there is a problem - how to cool the inside. > >>>> I was thinking that PC components could be cooled with water, but I > >>>> do not know, what to do with monitor. > >>> > >>> I have a wide screen 18" LCD, also on the other side of the lexan > >>> divider, > >>> and so far, knock on wood, zero problems. I think I vacuumed the > >>> outside > >>> once last summer. > >>> > >>> OTOH, I suspect your setup might be getting 20x the use mine is, so > >>> you might want to consider that. I personally lose 3 or 4 > >>> keyboards to one of > >>> any other problems, swarf is hell on keyboards. > >>> > >>>> Could You, please, share Your experience and/or know-how about > >>>> cases/boxes of PCs in industrial machines? > >>>> > >>>> Viesturs > >>> > >>> My $.0.02. :) > >>> > >>> Cheers, Gene > >> > >> Yet another approach is to duct clean pressurized air into the > >> cabinet from some other location and put a vent on the side of the > >> box to allow the air to escape. > >> > >> If you run some 3" dryer duct and feed that with a fan similar to a > >> bathroom fan (cheap ones are less than $20 around here), you can get > >> air 40+ feet from the machine and direct it into the panel. > >> It doesn't take much pressure to keep all of the dust out of the > >> panel. > >> > >> Dave > > > > One more option: A panel air conditioner. Hoffman sells them. I > > think that Rittal might sell them also. Seal everything up and cool > > it with with the AC. > > > > I put an EMC2 system in a plant that cuts foam which gives off some > > very corrosive gases. The machine has been running everyday for a > > year and a half. > > The gases are so corrosive that any Stainless Steel less than 316 > > rusts. 316 just turns dark. Both the computer and the screen are > > inside the cooled cabinet. > > > > Dave > > Hey, if they are milling that particle board... what are they using for > a binder in that stuff now?? They used to use some type of formaldehyde > binder but I think they got rid of that due to off gassing making people > sick.. Are you seeing any signs of corrosion on the PC?? > Are the machines frames and bolts corroding at all? On the PC, look at > things like the Ethernet connector shell and the USB ports - the shiny > plated metal will start to dull if you have a corrosion problem. > > Dave It hasn't made dust of more than an ounce of particle board if that much. I use real woods, maple, cherry, walnut, white ash, even poplar but little or no plywood, OSB or MDF. If a pad of MDF is under the workpiece, it will probably get touched by 10 thou of the bit if the machining goes all the way through. Generally it doesn't.
I have had some rust problems, but I rigged up a small heater on a separate thermostat, cranked up if I'm working in there for any length of time, but normally set for about 40-45F, whatever it takes to keep the temps above the dew point in an un-insulated, T-111 walled 12x16 shed. I have one of those 10 dollar temp and humidity gizmo's stuck the the upper cover of the bandsaw, and if I see the humidity is above 50%, I'll dial it up 5 or 10 degrees. Really really cold, there is another 1.5kw heater I can turn on, but its electronic thermostat doesn't go below 60F, and its power failure mode is to forget it was turned on. I keep both of them clear of flammables obviously. That doesn't mean I haven't had 6" or more of wood dust on the floor quite a few times as that HF die grinder throws it all over when cutting tenons, 7 to 8 feet away will have an inch too. And I occasionally clean the mud it makes out of vactra or stp off the ways of the mill or that teeny little metal lathe. Clean cannot describe that shop at any time since I built it about 12 years ago without seriously redefining the word clean. Too much stuff in there to even think about just sweeping it out. Vacuum it, or blow it out the door with an air hose, or nothing. I have even pulled the dust hose off the jointer or bandsaw and used that for some of it. I have a small dust collector hanging on the outside under an eave, but the bag is one I sewed up out of poplin that can hold about 100 gallons of dust. 40 lbs in the bag doesn't seem to bother the suction. It was filled and dumped 3 times this summer, filling a 42 gallon garbage can each time. Getting that to the curb is a challenge as the only way that doesn't have 2 foot dropoffs is all the way around the lower end of the house. If we were to stomp WV out flat, it would be bigger than Texas. ;-) > ------------------------------------------------------------------------ > ------ RSA(R) Conference 2012 > Save $700 by Nov 18 > Register now > http://p.sf.net/sfu/rsa-sfdev2dev1 > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> I'm not a level-headed person... -- Bruce Perens ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
