On Friday, November 04, 2011 07:21:14 PM Rafael Skodlar did opine: > On 11/04/2011 08:32 AM, Viesturs Lؤپcis wrote: > > 2011/11/4 Les Newell<[email protected]>: > >> In general wood dust does not affect computers that much. I have seen > >> machines with piles of dust inside, still working fine day in day > >> out. Heat is an issue so do as much as possible to keep it cool. > >> Possibly fit an over sized CPU cooler. > > > > The thing is that machine works correctly for 40-50 mins, then > > malfunctions begin to appear - it does not run a file, when button is > > pressed and some other. Or it ruins a part, just as if motor had lost > > steps, but the trick is that next part if good without rehoming or any > > other activity taken - just change material and run the file. > > If the OS is not crashing then your problems are elsewhere as others > have suggested. Depending on your motherboard, it's components > temperature can be monitored with utilities like digitemp fancontrol > hddtemp lm-sensors. I cannot tell how well they work with RT kernel and > EMC as I haven't tried it. > > I put a thermometer with memory for high and low records in areas of > interest many times. It helped me relate server crashes to environment > temperatures. You might put such a thermometer in the control box for 24 > hours to see what the extremes are. >
Wallmart has these, reads humidity too, about a tenner in USD. > Temperature logger would be even better. You may want to check in > Arduino world for such a sensor/shield solution. > > > And the more machine is running the more often these malfunctions > > appear. That tells me that some parts in machine are overheating and > > thus not functioning properly. I would like to blame the dust that > > gets in all the narrow places on the boards and disturb normal heat > > dissipation. > > It's possible you have a poor connection somewhere. Connectors are metal > which expands and contracts with a temperature and also act as "unwanted > vibration sensors". Check the connections first. > > It's also possible you have a component with a cold solder joint which > also reacts to temperature and vibration. That would explain why your > CNC system resumes working without errors at some point. > > Is it possible that the problem appears when the machine (tool, router > etc.) is in a particular position? That could indicate a broken cable, > more likely on older machines. > > To troubleshot such problems I use a screwdriver handle or some other > insulated material and tap on different components or wiggle the wires > to see if that triggers a problem. > > You might want to check screws that hold wires in connectors or terminal > blocks. They tend to get lose or corrode sometimes. > > While wood is not causing electric problems most of the time, it's dust > could bring moisture into the box that would cause connection problems > or corrosion. > > And let's not forget grounding again. Make sure all is well grounded all > the time. > > >> If you want to enclose the computer in a box, fit a fan on the side > >> pushing air into the box. In other words the box becomes slightly > >> pressurized. That stops dust from creeping in through cracks or door > >> seals. Filter the air coming in with an air filter from an older car, > >> the type that is just a big round ring that sits in a frying pan > >> shaped housing. Clamp it to the side of your box with a round disc > >> of wood or metal. You will have to replace the filter fairly > >> regularly but they are quite cheap. > > > > That is why I would like to put them in totally sealed box. > > In that case I could implement water cooling for PC components. > > I like this idea but you need to monitor/check plumbing every once in a > while which in my experience almost never happens. All equipment I ever > supported in industrial environment come with instructions for regular > maintenance. Some even include nice log books or sheets to keep track of > it. I've seen empty pages too many times so that needs to be taken into > consideration. > > Another option is to use heat-pipes which are frequently used to cool > components inside sealed boxes in industrial and military systems. > Search for "DIY heat-pipes" > > Heat-pipes are not going to cool every component of course, just those > that touch it directly. Trouble is that they need to be custom made most > of the time. > > Let me give you one link http://www.silentmods.com/section2/item230/ > > > What should I do about monitor? > > Modern industrial monitors work well in wide temp range but cost more. > Use either that or check how they solve this problem as others have > suggested. Google "heat exchanger design" for tons of links. > > >> Many bigger commercial machines use air to air heat exchangers so the > >> clean air inside the box and dirty air outside never mix. > > > > Any idea, how to do that in a cost-effective way? > > > > Viesturs > > See above. 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> When all other means of communication fail, try words. ------------------------------------------------------------------------------ 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
