On Monday, August 01, 2011 07:59:44 AM Lester Caine did opine: > gene heskett wrote: > >> Some customers drop on a couple of cable > >> ties as well just as extra security from knocks. > > > > Metal ties?, or the common 100 to the bag I can get, and have in stock > > from Lowes. They will relax, eventually I've found. > > Plastic ones, but it's one of those items that you have to keep an eye > on, just like damage to the cables ... > > >> I'm normally fixing to new motors, and I've converted quite a number. > >> Roughen up the backside of the box and a quick wipe with solvent > >> always seems to work. > > > > Solvent = alcohol I assume. Acetone or MEK would remove the paint I'd > > think. > > PCB cleaner ;) I've a big tin from when I used to do a lot more PCB's > manually > > > Anyway, that open frame psu is ordered, along with a 120vac 125 cfm > > ball bearing fan. That /should/ cool the whole thing once I find a > > box to put it all in. And should run much quieter that those > > screaming 90mm models turning 7-8 grand I am using now. I'll get a > > sheet of alu from the recyclers to mount the stuff on which should > > enhance the heat handling& make a box to flow the air through a > > filter I can see& change. > > If you are replacing the PSU, I would have gone with one that gave 42 or > so volts ... 500W 30V toroidal transformer + bridge and cap is all you > need. http://medw.co.uk/articles/read.php?article_id=12 > No fan - just a 6mm Aluminium heatsink on the bottom, but I would add > the fan for 4.2Amp continuous working, the 180Ncm motors run 3Amp and > the controller does not get too hot over hours, but the British weather > helps keep things cool > > :) - Of cause adding the fan does let the dust in ... > : > > Now for a BOB with opto driving buffers, I have another msg about that > > here someplace. ;-) > > You don't need any more opto-islation on the stepper drivers, just a > simple buffer between the computer and the existing opti-isolation on > your new drivers. Adding more 'slow edges' just detracts from > performance? I opted to drop any optos on the BOB so the mains outlets > are solid state relays as well, but the ITX motherboards need a good > buffer before any opto-isolators and many off the shelf BOB's don't > work reliably with them. But I though you already had a suitable BOB?
But then I lose that when the xylotex board leaves. Looking at the cnc4pc's C1G as it looks like it has all the bells and whistles I /might/ need. Just programmable buffers, no opto's, tally leds all over. It should do the job. That is some neat packaging Lester. And is similar to what I have in mind. I need to scout for, humm, I may have it in the basement, in the form of a floppy drive tower made out of 1/8" and 1/4" alu. The idea being to use the fan to distribute the heat so no external openings need be used, just the hot box itself. I might check to see if Dave has any more of those heat sinks I flattened the bottom of so he could test transmitter modules, that would be ideal and no fan required at all. 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) Not everything worth doing is worth doing well. ------------------------------------------------------------------------------ Got Input? Slashdot Needs You. Take our quick survey online. Come on, we don't ask for help often. Plus, you'll get a chance to win $100 to spend on ThinkGeek. http://p.sf.net/sfu/slashdot-survey _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
