On Saturday, April 21, 2012 01:55:08 PM Kent A. Reed did opine: > On 4/21/2012 11:42 AM, gene heskett wrote: > > Hi all; > > > > I was able to find a schematic for one of the earlier controllers used > > in these machines, for one that had the external interfacing stuff on > > a daughterboard and I suspect it might be usable as a trouble > > shooting guide if it was printable. But that link isn't printable, > > for some reason pages 2 and up are blank in the print preview. > > Gene: > > I surmise you might be looking at the dcmotorcontroller.net site, which > I just found via Google. When I choose schematic and try to print the > page I get only the first bit.
Same as I got, so I right clicked and used 'flashgot all' which did not pull any if the images. So I used ksnapshot, which was only somewhat useful but I did get some prints by loading those back into LO to print them. Mine doesn't have the power transformer but has a load of 5 watt metal film R's in that location. Hopefully, what I have is a bad tsop version of one of the lm324's, but I've not managed a trip to the shop to see if I can confirm that. I see that LMS has a hookup with someone who is doing a flat rate $60 fix service on these boards. The replacement board for mine would look like: <http://littlemachineshop.com/products/product_view.php?ProductID=1336&category=5> The main diff between that board and mine is that mine has a genuine terminal strip in the left hand green euro style connector position. But other than the euro style not being nearly as dependable a connection, there doesn't appear to be any other diffs. One radical thought has crossed my mind though. If my board is good from the opto's on, are there the tools available in the hal modules, for me to bind my encoders output into a PWM signal and a dir signal and actually control my motors speed with a software PLL whose divisor for scale was tied to the circle styled + and - start buttons, for enable and dir, and the two + & - buttons below that would then adjust the PLL's divisor between my encoders output, with the error diff becoming the width modulator for the PWM output? There would have to be a low pass filter in this 'correction' signal as I have found that enabling the thing from dead to say 500 rpms can't be done as it will clear the fuse in about 1/2 rev of the motor, the acceleration is quite violent. > However, the schematics consist of a > bunch of gif files which you can select and print individually by the > simple expediency of right-clicking each image, opening it in a new tab, > and printing. Didn't try that just now, but I did save the individual images, thank you very much for the hint. I am a bit lost as FF used to have a view page src function where you could pick out addresses and wget the stuff you wanted. This seems to work as well, and once used to it, just as useful. > > The controller in my lathe is probably the next generation, no > > daughterboard because the mini-dip chips that were on the > > daughterboard were shrunk down to tsop stuff, allowing the whole > > thing to be fitted to only 1 pcb assembly. Also, no power > > transformer, instead a bunch of 5 watt metal film R's occupy that > > location on my board. LMS has that board, for $121. On BO though till next week estimated. > > I have also found a hookup schematic that incorporates an extra > > cnc/manual switch and reversing relay that my current interface board > > should work with, so what I need now is a working schematic. Does > > any one have such a beast? > > The hookup schematics on the littlemachineshop.com site? > > > Cheers, Gene > > So far, I haven't had the need to open the controller case of my > (manual) late-model Micro-Mark lathe. I'll be happy to hear what you > learn. Which I'll gleefully relate, once its working. But you make me jealous, your Micro-Mark is apparently a much finer finished machine than my SpeedWay. I haven't touched anything on this lathe that hasn't needed drastic refitting. While I like the idea of my Z drive, where I installed a home made taper lock hub into a 40 tooth metal change gear, and have the 425 motor mounted on the left, and engaging an 80 tooth change gear on the OEM screw, the backlash and spongyness of the half nut is going to need another session of fine tuning that will still leave at least .010" of backlash and springiness in the drive. Its currently in the 0.030" range. Some of that may be in the carriage to bed fit as the original carriage, when pulled firmly to the v-way, was then tilted up by about 80 thou at the back of the bed! I turned the carriage over and tried to correct the V angles on my mill, but its possible its a bit hourglass shaped so it can turn a few seconds left & right. I can't see as that is whats happening, and I don't have a 2nd _matching_ dial indicator I could read the back of the carriage with, not yet anyway. Little pissy-assed things like that should get me to drop the card up in Lycoming Mall, PA, at Grizzly, for a G4003G yet. But that card drop would be for about 4 G's & then I'd need bigger motors, or even servo's, basically starting all over. Not knowing how much time I'd have to get that working means it won't happen. Diabetics don't even have a guarantee of making it from this chair to the little room in the middle of the house. We just keep going at a comfortable pace until... Pix of both drive motors are in Genes-os9-stf/eagle on my web page. X, mounted on the back of the carriage is soso & might need a 252 motor yet, that one is only 50 oz rated, but Z is going to need another damper made, it rattles the gears unmercifully at about the normal cutting speed that lathe-pawn.ngc drives it at, and I think resonance is killing me at about 30" a minute rapids when the microstepping is at 8, but at 16x, linuxcnc runs out of stepgen headroom at about that same speed. But it sure moves silky smooth & quiet at 16x stepping. BTW I found a wiring diagram I'll use when I get back to this again, it adds a cnc/manual switch to I can run it either way. But you probably should get it from the <http://tetralite.com/lathe/> site where I "borrowed" it from. I'll need to find another DPDT relay to go with the DPDT switch, NBD. Hopefully I can source those at the shack, but the pickins are getting slimmer all the time there. > Regards, > Kent Cheers Kent, 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> God made machine language; all the rest is the work of man. ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
